The current experimental investigation presents a comparative evaluation of selected biodegradable polymer blends and their composites, focusing on their material properties. Two biopolymers, polylactic acid (PLA) and polybutylene adipate-co-terephthalate (PBAT), along with pineapple fibers (F), as bio-reinforcement were taken for the analysis, which was conducted in two stages: During first stage, PBAT was melt-blended with PLA in varying weight fractions (10, 20, 30, 40, and 50 wt%) to produce PLA/PBAT blend (B) and in second stage, PLA, PBAT, B 80/20 blend were reinforced with pineapple fiber (10, 20, and 30 wt%). The samples were fabricated using extrusion-injection molding. The samples were characterized for density, thermal degradation, crystallinity, and mechanical behaviour. Among the blends, the optimal B 80/20 combination exhibited tensile strength, flexural strength, and elongation at break of 47.9±2.4, 88.2±5.4 MPa, and 330.6±10.47%, respectively. Results indicate that the PLA-based composites (PF) exhibit significantly better density, tensile strength, and flexural strength as compared to neat polymers, blends, blend-based composites (BF), and PBAT-based composites (TF). Among the PF composites, the PF 70/30 composite demonstrated superior performance, with maximum tensile and flexural strength values of 73.9±1.3 and 107.1±4.3 MPa, respectively.

The market for bio-based thermoplastic polymers and their composites has experienced significant growth for non-structural applications due to their sustainable characteristics and adequate mechanical properties. However, the comprehensive degradation behavior of these sustainable materials after end-of-life remains underexplored. The current research endeavor focuses on the degradation behavior of bio-based poly(butylene succinate) (bio PBS) and its composites under specific compost conditions, as per ASTM D5338-15. The degradation rate of the developed specimens was evaluated based on weight loss, surface morphology, degree of crystallinity, and chemical modifications. The surface morphology of degraded samples exhibited biofilm formation and surface erosion. The crystallinity of virgin bio-PBS decreased by approximately 56% after 6 months of degradation in a compost environment. Fourier transform infrared spectroscopy (FTIR) results of degraded specimens revealed an increase in the number of carbonyl groups (C--O), attributed to the polymer chain scission of ester linkages in the bio-PBS and its composites.

Fused filament fabrication (FFF) process has shown great promise for producing load-bearing composite parts with recycled carbon fiber reinforcement. This current research work proposes a novel method for producing functionally graded polyamide-6 composites reinforced with recycled milled carbon fibers via strategic multi-material extrusion using FFF technology. The polyamide-6 filaments with 0%, 5% (low), and 20% (high) recycled carbon fiber were produced using a twin-screw extruder and printed into composites with varied fiber gradients. The low-to-high fiber gradient composite (cPA(5,20)CF) achieved the best mechanical performance with tensile modulus being 43% higher than without fiber gradient higher fiber content composites (cPA20CF), while maintaining material efficiency. Relatively high density and low porosity were observed in cPA(5,20)CF among other gradients despite processing complexities. Thermal analysis confirmed that adding carbon fibers improved flame retardancy, increasing the Limited oxygen index (estimated LOI) from 17.5% to 25%, as estimated from char residue using van Krevelen's empirical correlation. Carbon fibers also enhanced crystallinity, promoting thermal stability. Fractographic studies showed that gradual fiber gradients reduce interfacial stresses and failure, whereas abrupt changes in fiber gradients (cPA(0,20)CF and cPA(0,5)CF) led to fiber debonding and voids. Overall, adding recycled carbon fibers to FFF-printed polyamide enhances thermal, mechanical, and fire-resistant properties ensuring tailorable performance. The proposed approach enables the development of durable, complex semi-structural components suitable for aerospace and automotive applications.

In the current experimental investigation, biocomposites (BCs) were fabricated using banana fibers (BF) and pineapple fibers (PF) and poly(butylene adipate-co-terephthalate) (PBAT) and polylactic acid (PLA) matrices using melt compounding and injection molding. Banana fiber-based biocomposites (BF-BCs) and pineapple fiber-based biocomposites (PF-BCs) were fabricated by incorporating (10-30 wt.

The present investigation aims at development of sustainable biocomposites by integrating 5-15 wt% pearl millet starch (PMS) as a bio-filler, into poly(butylene adipate-co-terephthalate)/polylactic acid (PB/P) blend. The starch-based biocomposites (SBCs) were synthesized through solvent-casting approach and processed using mini-extrusion and mini-injection molding. The SBCs were characterized to evaluate their physical and thermal behaviour, chemical composition, crystallinity, mechanical performance, and fracture-morphology. Degradation behaviour of the SBCs was investigated under environmental aging conditions, such as thermo-oxidative aging (TOA), hygrothermal aging (HTA), and natural outdoor weathering (NOW) for exposure durations of 30, 60 and 90 days (days: D). In the unaged state (0D), the addition of (5-15 wt%) PMS into the PB/P blend, led to marginal increase in tensile strength from 9.77 +/- 0.32 MPa (PB/P) to 10.74 +/- 0.19 MPa (PB/P/MS-15). After 90D exposure, PB/P/PMS-15 showed the highest reduction in tensile strength under HTA (similar to 72.68%), followed by NOW (similar to 46.00%), and TOA (similar to 22.75%). The PMS was incorporated, as a biodegradable, agro-waste-derived hydrophilic filler that facilitate moisture diffusion, enhances microbial accessibility (NOW), and trigger early chain scission, thereby catalysing the overall degradation of SBCs. The investigation could generate significant experimental data and presented analyses on degradation characteristics of SBCs under real-time NOW exposure; a rapid degradation history was monitored. Additionally, a comparative assessment of degradation behaviour of the biocomposites under multiple aging environments have been provided. The findings are particularly relevant for single-use products (especially, in vitro diagnostic (IVD) medical devices), thereby contributing to the development of sustainable medical technologies.

Drilling process plays a vital role in numerous industries and represents more than one-third of all machining operations. The prime advantage of conventional drilling operations as compared to other hole making techniques is that these enhance output and productivity efficiently, in less time at a reasonable cost. The current research endeavor seeks to optimize the cutting parameters for drilling of in-situ cast Al-4.5%Cu-1.5%Mg-7%TiB2 composite by employing the desirability function and non-dominated sorting genetic algorithm II approach. Considering the objective, the cast composite was drilled using three machining parameters (input); cutting speed, feed rate, and diameter of twist drill, and drilling response characteristics (output); thrust force, mean cutting time and surface roughness were analyzed. Chip morphology and tool wear characteristics have also been analyzed and reported. The mathematical prediction models for thrust force, mean cutting time, and surface roughness were generated using response surface methodology, and results showed that the anticipated and experimental outcomes were in close agreement, indicating the model's high accuracy. An analysis of variance approach was employed to assess the influence of drilling parameters on the response variables. Compared to response surface methodology-desirability function and non-dominated sorting genetic algorithm II predicted a lower value of optimal thrust force, mean cutting time, and surface roughness with a desirability of 0.9590.

In this study, eggshell-based nanocomposites were fabricated using PB matrix (PB or PBAT: poly (butylene adipate-co-terephthalate)) reinforced with eggshell nanoparticles (ESNPs, 10-30 wt.%), hereafter referred to as PBAT-eggshell nanocomposites (PB/ES NCs). The PB/ES NCs were synthesized through solvent-casting method, followed by mini-extrusion and mini-injection molding. The fabricated materials were characterized in terms of hygroscopicity behavior, surface roughness, thermal behavior, chemical constituents, crystallinity, mechanical performance, morphological features, nuclear magnetic resonance (NMR), and abrasive wear. Evaluation revealed that the fabricated PB/ES NCs with 30 wt.% ESNPs (denoted as PB/30ES) exhibited reasonable mechanical performance. The PB/30ES demonstrated significant improvements of 55.56% in tensile strength, 34.20% in tensile moduli, 28.52% in flexural strength, 10.00% in flexural moduli, 10.96% in hardness (shore D), and 11.92% in elongation at break, as compared to PB/10ES. The PB/ES NCs demonstrated reasonable miscibility between the PB matrix and ESNPs, as observed through NMR analysis. The ESNPs serve as an eco-conscious substitute for polylactic acid (PLA) and conventional non-biodegradable polymers, offering improved tribological performance alongside sustainability and enhanced functional properties. The present investigation demonstrates the potential of PB/ES NCs as sustainable and biocompatible materials, for low-friction and better wear-resistance healthcare-related applications.

Conventional chemical treatment of lignocellulosic fibers imposes a burden on environment and compromises the sustainability goals, whereas bio-based tartaric acid (TA) offers a more sustainable approach with lower environmental impact. Hence the current research work focuses on an eco-friendly treatment of kenaf fibers (KFs) with varying concentrations of TA (5%, 10%, 15%, and 20%) and treatment duration (30 and 60 min) at a constant temperature of 80 degrees C. The treated KFs were analyzed to identify the influence of TA on average breaking force, thermal stability, crystallinity, surface morphology, chemical, and structural changes. Furthermore, an alkali treatment with 5% sodium hydroxide (NaOH) for 120 min at room temperature (30 degrees C) was used as a reference to compare the modifications induced by TA. A cradle-to-gate life cycle assessment (LCA) was conducted to compare the environmental impacts of NaOH and TA based treatment of KFs. The KFs treated at lower TA concentration (5%) for 60 min duration (5TA60), showed superior fiber characteristics due to the esterification and crosslinking of cellulosic chains as well as elimination of irregular aromatic phenylpropanoid units (lignin) and heterogeneous polysaccharide units (hemicellulose). These improvements resulted in enhanced breaking force (38.12 f 7.69 N), thermal stability (Tonset: 260 degrees C, Toffset: 370 degrees C), crystallinity (66.7%), and surface roughness (Ra:116.50 f 11.67 nm). The results for 5TA60 are significantly higher than untreated KFs and comparable with the referenced alkali treated KFs. These findings highlight the potential of TA in the functionalization of KFs to be employed as reinforcement in the hydrophobic polymers.

Poly(lactic acid) (PLA) reinforced with nanoparticles (NPs) has gained substantial interest as a biomaterial for internal bone fixation, where the tribological, mechanical behavior, and antibacterial properties are major concerns, and to address the limitations of metallic implants by enhancing biocompatibility, minimizing stress shielding, and eliminating secondary removal surgeries. This study aims to develop PLA hybrid nanocomposites (NCs) reinforced with NPs (egg shell (ES), hydroxyapatite (HAP) and TiO2) fabricated by injection molding followed by homogenous dispersions using solvent casting process, samples were pure PLA (PLA_IM), PLA/ESNP (PE_IM), PLA/HAP (PH_IM), PLA/ESNP/TiO2 (PET_IM), and PLA/HAP/TiO2 (PHT_IM). The compositional analysis of prepared composites was examined through Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM), Energy Dispersive X-ray Spectroscopy (EDX), and X-ray Photoelectron Spectroscopy (XPS). Their shore D hardness, Izod impact strength, and mechanical behavior under fluctuating dynamic load (dynamic mechanical analysis (DMA): frequency sweep) at human body temperature (37 degrees C), cyclic stress were performed on PLA hybrid NCs. Wear behavior of worn surface characteristics was examined using FESEM, and 3D topography. Results showed that wear rate increases with applied load (5-9 N) and sliding speed (300-500 rpm) but decreases with the addition of harder bioceramics as filler, which enhances wear resistance. A machine learning method, i.e., Linear and Random Forest Regression, was used to predict the wear performance. The main concern, superior antibacterial activity for PET_IM and PHT_IM, highlighting their potential suitability for internal bone fixation of the maxillofacial (low-load-bearing) zone implant.

Water hyacinth (WH) creates several ecological problems within water bodies. Apart from being a biomass waste, it can be sustainable resource as its stem contains plenty of natural fibers. Synthetic fibers have a significant negative impact on the environment. This research aims to focus on the exploration of sustainable secondary natural fibers (biowaste). The investigation involves extracting WH fibers through a novel water-retting process. The extracted fibers were eco-friendly treated using sodium bicarbonate at three different concentrations (2.5 %, 5 % and 10 %) for three different time periods (24, 72, and 120 h). Then, fibers were characterized based on physical, mechanical (tensile strength), FTIR, XRD, and surface morphological (FE-SEM, AFM) features. WH fibers treated with 5 % w/v for 72 h and 120 h, and with 10 % w/v for 24 h exhibited favorable trend in properties as compared to other combination of parameters. Fiber treatment at lower and high concentrations for a prolonged period showed a degradation in the properties. FTIR results established the removal of non-cellulosic content from the fiber surface, which is also noticeable through morphological studies. Improvements observed in structural, surface characteristics, and mechanical properties indicates that fiber treatment with NaHCO3 can be an alternative to hazardous chemical treatment. A prototype was also fabricated using extracted fibers, highlighting their use as an alternative to synthetic fibers. The outcome of the current research endeavour is a step towards solving two global problems: the management of aquatic weeds and the replacement of energy-intensive synthetic fibers with natural WH fibers in non-structural applications.

Starch-based biocomposites (SBCs) were obtained by incorporating 5-15 wt% pearl millet starch (PMS) into poly(butylene adipate-co-terephthalate)/polylactic acid (PBAT/PLA) blend. The materials were prepared using standard polymer-processing techniques. The materials were characterized for thermal properties, chemical composition, and crystallinity, while biodegradation profile was evaluated through weight loss, scanning electron microscopy and GC-MS. Biodegradation studies were conducted under thermophilic industrial composting conditions (TICCs) at two time points - 45 and 90 days. The weight loss results show relative increase in degradation associated with higher starch content. Monitoring of surface morphology confirmed microbial colonisation and structural deterioration in terms of presence of cracks, microvoids, surface erosion, and microbial hyphae. Further, GC-MS results revealed formation of hydrolytic and microbial degradation by-products. The study confirmed that integration of PMS into PB/P blend enhanced microbial affinity owing to the presence of natural microbial enzymes. The enzymes triggered moisture and temperature-assisted degradation under thermophilic industrial composting conditions. The fabricated material thus exhibits potential as a sustainable alternative for single-use applications, for example- housing/ packaging components of few diagnostic devices.

Metal matrix composites play a dynamic role in manufacturing industries due to their superior engineering properties. The current research investigation analyses the effects of machining input parameters on process performance and proposes a robust hybrid optimisation technique for effective drilling of Al-4.5%Cu-1.5%Mg-7%(AlB2-Al2O3) composites. The machining input parameters considered are cutting speed, feed rate, drill diameter and point angle. The Taguchi L18 design has been applied to conduct drilling experiments. The main objective of this research work was to achieve the best drilling performance characteristics, such as low thrust force, torque and surface roughness. Main effect plots, chip morphology and tool wear mechanism were analysed and reported. From ANOVA results, the feed rate has been identified as a significant drilling parameter influencing the machining response characteristics. Regression models were developed and experimentally verified for each of the drilling response characteristics. The findings of the confirmation test revealed the desired improvement in machining responses. With a lower mean error (5.61%), the Taguchi grey relation analysis integrated with principal component analysis (TGRA-PCA) approach was determined to be better, suggesting a statistically significant model. The response surface methodology with non-dominated sorting genetic algorithm-II (RSM-NSGA-II) predicted a lower value of the optimal thrust force, torque, and surface roughness with a desirability of 0.9789 in comparison with RSM-DF and TGRA-PCA.

Polylactic acid (PLA) and polybutylene succinate (PBS), and their blends, have gained considerable attention as eco-friendly alternatives for packaging and transportation applications. PLA is recognized for its high strength but suffers from low ductility, whereas PBS offers excellent ductility but relatively low strength. To overcome these limitations, PLA/PBS blends were prepared with varying content of PLA from 100% to 20%. Two compositions, namely PLA80% PBS20% (which maintained similar strength while offering improved ductility) and PLA40% PBS60% (which maintained comparable ductility with increased strength), were found to be optimal. To further improve interfacial compatibility, these optimized blends were grafted with 6% bio-based itaconic acid (IA) in the presence of dicumyl peroxide (DCP) as a radical initiator (0.5% and 1%). Remarkably, PLA/PBS blends grafted with 6% IA and 0.5% DCP showed significant improvements in both mechanical and thermal properties, confirming the effective role of IA in enhancing miscibility. However, increasing the initiator concentration to 1% led to a deterioration of properties, which is attributed to chain scission induced by excess radicals. Overall, the current analysis highlights the potential of bio-derived IA as a sustainable reactive compatibilizer for tailoring the strength-ductility balance of PLA/PBS blends, thereby opening opportunities for the development of high-performance, eco-friendly polymeric materials.

The high processing costs and environmental concerns of conventional compression molding necessitate alternative approaches. Therefore, the present study investigates an eco-innovative approach for producing sustainable poly (butylene succinate)-kenaf composite laminates using a novel spring-forced compression molding (SFCM) setup, potentially utilizing solar energy for heating application. Composite laminates were then synthesized by reinforcing the PBS matrix with untreated woven kenaf fiber mats (KFM), denoted as PBS/K(UT), and with 5% alkali-treated woven KFM, denoted as PBS/K(TR). The processing parameters during the fabrication process included an average solar irradiation of 750-900 W/m2, concentrated solar irradiation of 97-116 kW/m2, wind speeds ranging from 1.5 to 2.5 km/h, and an ambient temperature of 38 degrees C. Identical samples (150 x 150 x 4 mm3) were fabricated for pure PBS, PBS/K(UT) and PBS/K(TR) laminates. The mechanical, thermal, viscoelastic, and water absorption behavior of developed bio PBS, PBS/K(UT) and PBS/K(TR) composites are compared. PBS/K(TR) composite shows superior mechanical and viscoelastic properties and in contrast, bio PBS demonstrates better thermal stability, highest crystallinity, and greater resistance to water absorption. However, the PBS/K(TR) composite shows improved thermal stability, crystallinity, and resistance to water absorption compared to the PBS/K(UT) composite.Highlights Eco-innovative processing of PBS-K Composites using solar-powered novel SFCM setup. Alkali treatment enhances mechanical and viscoelastic properties of composites. PBS/K(TR) composites exhibited superior mechanical and thermal properties. Bio PBS showed higher crystallinity, thermal stability, and water resistance.

The development of polypropylene (PP) composites filled with a biomass from fruit waste, citrus limetta peel (CLP) fillers is explored in the current study. A polymer matrix consisting of neat polypropylene was filled with 10, 20, and 30% weight percentage (w/w) of CLP. The composite specimens were produced by extrusion followed by injection moulding. In addition to thermal and morphological evaluations, the mechanical properties are determined, including tensile and flexural (both strength and modulus). The primary results demonstrate that, for a 10 weight percent filler content, the inclusion of CLP filler raised the tensile and flexural modulus of the neat PP composites by 20.23% and 14.33%, respectively. All of the composites were found to be thermally stable up to 220 degrees C through thermal investigation. The burning rate increased with the incorporation of fillers whereas, the dripping effect gets reduced. Filler agglomeration, filler pull out, and poor adherence with increased CLP filler content were observed using scanning electron microscopy. The developed composites have got tremendous potential to be utilized in non-structural applications. The consequences of plastic burden on the environment can also be reduced.

Life cycle analysis for lignocellulosic fiber-reinforced polymer composites is a systematic approach to evaluate the in-service life and end-of-life characteristics under various environments. The current experimental investigation aims to assess the durability properties under natural outdoor weather conditions (12 months) and end-of-life degradability under soil burial (6 months) of untreated and oxalic acid-treated sisal fibers (SFs) reinforced bio-based poly (butylene succinate) (bio-PBS) composites. Durability of biocomposites was evaluated using visual inspection, tensile and flexural properties, morphological characteristics using the Field emission scanning electron microscope (FESEM), thermal properties using thermogravimetric analysis (TGA), degree of crystallinity using X-ray diffractometer (XRD), and structural properties using Fourier transform infrared (FTIR) spectroscopy. End-of-life degradation characteristics of developed composites were determined using weight loss, microstructural analysis, and structural properties. The results of natural weathering revealed that the neat bio-PBS has retained approximately 74 % of tensile strength and 81 % of flexural strength after 12 months of aging, whereas composites retained 62-69 % tensile strength and approximately 70 % flexural strength. XRD results of 12-month-aged samples revealed that biocomposites have shown 19-21 % crystallinity. FTIR results showed that the number of carbonyl groups increased after aging. The results of soil degradation showed that ∼12 % weight loss occurred in untreated fiber-based composites. SEM images of soil degraded samples revealed surface cracks and fiber peeling. The degree of crystallinity of neat bio-PBS after soil degradation was reduced by ∼39 %. Overall, the incorporation of SFs can mitigate the performance of bio-PBS composites under outdoor natural weather and reduce plastic pollution after their end-of-life.

As the manufacturing landscape continues to evolve, the integration of intelligent decision support systems plays a pivotal role in offering sustainable, efficient, and informed decision making. The current study presents CompoCraft, a rule-based knowledge expert system designed to optimize manufacturing process selection for sustainable polymer composites during the conceptual design stage. The knowledge base for the expert system was developed using inputs from the domain experts across academia and industry. The process-criteria compatibility mapping was conducted using fuzzy ratings; where the criteria included material, part characteristics, and production requirements. The expert system performed selection in two phases: screening and ranking. The ranks of the screened processes were based on the process compatibility score (PCS). Additionally, a comparison based on cost ratings was conducted, empowering the designer to make an informed decision and select the most cost-effective process from the pool of highly compatible options. The validation of the system was performed by showcasing two case studies (Case I: coir polypropylene composite panel knob and Case II: jute epoxy composite chair back support and seat boards) for the natural fiber reinforced polymer composites. Thereon, sensitivity analysis was conducted to justify the system stability. Finally, the robust expert system; CompoCraft can be effectively used by domain practitioners, designers, or researchers.

Plastic waste is a global concern due to its environmental and health risks. Recycling plastics offers a sustainable solution by transforming waste into new materials. This study focused on developing recycled polyvinyl chloride (PVCr) composites reinforced with kenaf and wood fibers. The composites were fabricated via the melting method using a twin-screw extruder and compression molding, and their mechanical and flammability properties were assessed. Adding 20% kenaf or wood fiber significantly enhanced the composites' tensile and flexural strengths. Kenaf fiber improved both strength and modulus, with 20% loading increasing flexural strength by 95% and tensile strength by 54%, compared to 10% loading. Similarly, wood fiber composites showed a 21% increase in flexural strength and a 55% improvement in tensile strength at 20% fiber content. Overall, kenaf fiber outperformed wood fiber in tensile and flexural properties. In flammability tests, all samples exhibited self-extinguishing behavior, with flames extinguishing before reaching the 25 mm mark in the horizontal burning test. These findings demonstrate that recycled PVC composites reinforced with kenaf and wood fibers offer improved mechanical performance and fire resistance, making them suitable for various engineering applications.Highlights Adding 20 wt.% kenaf or wood fiber to recycled PVC increased strength and modulus compared to a 10 wt.% loading. Tensile and flexural modulus improved with kenaf fiber addition. Kenaf fiber outperforms wood fiber in tensile and flexural strength. Horizontal burning test showed self-extinguishing properties in all samples.

Plant-based macromolecules such as lignocellulosic fibers are one of the promising bio-resources to be utilized as reinforcement for developing sustainable composites. However, due to their hydrophilic nature and weak interfacial bonding with polymer matrices, these fibers are mostly incompatible with biopolymers. The current research endeavor explores the novel eco-friendly oxalic acid (C2H2O4. 2H2O) treatment of sisal fibers (SF) with different concentrations (2, 5, and 8 % (w:v)) and exposure duration (4, 8, and 12 h). Optimum treatment conditions were achieved through the single fiber strength testing of SFs. The tensile strength of the treated fiber with 8 % concentration and 12 h exposure duration (TSF/8/12) increased by approximately 60 % compared to untreated SF. Fourier transform infrared spectroscopy (FTIR), morphological observation, X-ray diffraction (XRD), and thermogravimetric analysis (TGA) of untreated and treated fibers confirmed that TSF/8/12 has better mechanical and crystallinity behavior than its counterparts. The thermal stability and maximum degradation temperature of the TSF/8/12 are 232 degrees C and 357 degrees C. Sustainable composites were fabricated by introducing the treated SFs (30 wt%) as reinforcement in a bio-based poly (butylene succinate) (bio PBS) matrix. The experimental evaluation of mechanical properties, thermal degradation behavior, and water absorption established that treated fiber-reinforced biocomposites (bio PBS/TSF/8/12) have strong interfacial bonding between constituents that resulted in better thermal stability and decreased water uptake than untreated sisal fiber (USF)based composites (bio PBS/USF). The results of the soil degradation confirmed that SFs expedite the rate of degradation of composites due to the increased availability of hydroxyl groups.

The current experimental investigation aims to evaluate the durability properties of sustainable composites under accelerated thermal cycling. Sisal fiber (SF) reinforced bio-based poly (butylene succinate) sustainable composites (Bio PBS/SF) were manufactured using extrusion-injection molding with optimized process parameters, such as extrusion speed of 45 rpm and the processing temperature ranges from 135 degrees to 155 degrees for both extrusion and injection molding. Along with untreated and treated fiber polymer composites, specimens with a centric hole and bolted joint samples were fabricated using a conventional drilling machine. Thereafter, the developed specimens were exposed to accelerated thermal cycling conditions (+50 degrees C and-20 degrees C) for six months. The performance of composites assessed in terms of the mechanical properties using the Universal testing machine (UTM), structural modifications using the Fourier transform infrared (FTIR) spectroscopy, degree of crystallinity with the help of X-ray diffraction (XRD), and thermal behavior using thermogravimetric analysis (TGA), as well as visual and weight loss properties. Neat bio PBS has retained 83 % of its original tensile strength (25 MPa), whereas the untreated and treated fiber-reinforced bio PBS composites have retained 51 % and 57 %, respectively, and the maximum failure load of the bolted joint has been reduced by 36 %, revealing the structural modifications in the developed composites after aging. The SEM micrographs of tensile fractured samples revealed the embrittlement of polymer and its composites after aging. The current research has provided knowledge to sustainable product designers and has helped to widen the application spectrum of sustainable composites.