Radiative cooling textiles offer a promising approach for personal thermal management, yet conventional singlelayer designs often fall short in achieving effective temperature regulation. To overcome this limitation, a Janusstructured PVDF-HDPE/BN textile was prepared via functional group matching and hierarchical structural regulation. The optimized textile, fabricated with 12 wt% PVDF, exhibits outstanding spectral selectivity, with a solar reflectivity of 93.24% and an atmospheric window emissivity of 98.45%, enabling highly efficient sunlight reflection and radiative heat dissipation into outer space. Furthermore, the incorporation of high thermal conductivity h-BN into the bottom layer enhances the in-plane thermal conductivity, facilitating quickly transfer of body heat to the top PVDF radiation cooling layer and thereby enhancing the efficiency of the cooling efficiency. For the personal thermal management applications, the 12PVDF-HDPE/BN textile achieves a daytime temperature reduction of up to 7.59 degrees C. When applied to the building exteriors, it attains a cooling effect of 9.7 degrees C under outdoor conditions, with performance further strengthening under increased solar irradiance. In addition, the composite textile demonstrates excellent moisture-wicking and breathability, promoting convective heat convection and enabling more efficient body cooling efficiently. This work provides a scalable and multifunctional material strategy for next-generation radiative cooling textiles suited for both personal and architectural applications.

Developing multifunctional textiles integrating energy-efficient thermal management and robust electromagnetic interference (EMI) shielding remains a significant challenge. Herein, a stretchable phase-change fiber membrane with a programmable wrinkled conductive network is fabricated by in situ depositing silver nanoparticles (AgNPs) on a pre-stretched coaxial electrospun substrate. Its hierarchical structure, comprising paraffin wax (PW) encapsulated in the polyurethane (PU) shell and a surface-wrinkled AgNP layer, delivers a high latent heat of 73.8 J g-1, along with deformable photothermal and Joule heating. Numerical simulations corroborate that the synergy of dual-mode heating and PW-based energy storage allows effective personal thermal management at low temperatures. Moreover, the membrane exhibits an initial EMI shielding effectiveness (SE) of 66.4 dB, retaining 33.71 dB even at 100% strain due to its elastic wrinkled topology. Endowed with hydrophobicity, breathability, and mechanical stretchability, the composite presents a promising platform for next-generation wearable devices requiring integrated thermal regulation and adaptive EMI protection.

Film casting is a predominant industrial method for manufacturing polymer films, whose end-use properties are critically governed by microstructure and morphology. Understanding the polymer crystallization under realistic processing conditions remains a challenge because most studies rely on simplified laboratory-scale models that cannot capture the complexity of industrial operations. This study bridges this gap by integrating an in situ high time-resolved synchrotron X-ray scattering technique with a custom-designed industrial-scale steel belt casting line, enabling continuous structural monitoring from the melt to the fully solidified film under independently controlled stretching ratio (SR) and belt temperature (T belt). Under low SR (1.398 - 3.18), the 100 -140 degrees C temperature window and moderate temperature gradients (T gra <= 225 degrees C/mm), we observe direct and preferential nucleation of the metastable beta-phase without epitaxial growth on alpha-templates, which is a phenomenon not captured in conventional model experiments. This direct beta-nucleation occurs within a specific processing window (100 -140 degrees C) and demonstrates that coupled flow and thermal fields can kinetically override thermodynamic preference. Increasing SR progressively favors alpha-phase nucleation, while raising T belt promotes beta-phase formation up to 133 degrees C. Total crystallinity remains invariant at similar to 65%, but the alpha/beta ratio changes systematically, and a through-thickness phase gradient is confirmed by FTIR mapping. These results establish a mechanistic framework for phase selection in industrial film casting and highlight the necessity of realistic processing conditions for discovering new crystallization pathways.

Developing phase-change fabrics for multi-source energy harvesting is crucial for personal thermal management, yet modulus mismatch between elastic matrices and rigid fillers still causes functional failure under deformation. Herein, a deformation-adaptive, hierarchically structured phase change fabric is engineered via coaxial electrospinning followed by pre-strainu2013assisted MXene deposition. This design robustly encapsulates a paraffin wax (PW) core within a polyurethane (PU) sheath to prevent leakage, while the wrinkled MXene architecture mechanically decouples the rigid conductive network from the stretchable substrate. This geometry accommodates tensile strain through geometric unfolding, preserving a substantial latent heat of 105.0 J/g alongside excellent gas permeability. Consequently, the fabric exhibits deformation-insensitive thermal performance, maintaining saturation temperatures of 42.3 u00B0C (100% strain, 50 mW/cm2 irradiation) and 41.7 u00B0C (90% strain, 2 V). Simulations further highlight its robust reliability in cold environments (u22124 u00B0C), a 238 s photothermal charge sustains comfort for 2960 s, while a mere 120 s electrothermal input extends protection for over 2864 s. Even under 150% tensile strain, the electrothermal mode maintains skin temperature around 30 u00B0C after u2248 2800 s. By synergizing mechanical robustness, breathability, and reversible energy storage, this work presents a versatile structural strategy for multi-scenario wearable thermal management.

High-performance thermoelectric materials (TE) are significant for sustainable development. Among them, ionic TE materials have attracted significant attention mainly due to their ultrahigh thermopower, higher than that of electronic TE counterparts by 2-3 orders in magnitude. However, they cannot be directly adopted in the conventional thermoelectric generators (TEGs) because the ions cannot transport across the electrodes into the external circuit. Instead, they are used in ionic thermoelectric capacitors (ITECs) for heat harvesting. A big concern for ITECs is that they cannot generate electricity under steady temperature gradient. Here, we report a mixed ion-electron thermoelectric generator (MTEG) that can harvest heat under both fluctuating and steady temperature gradients. An ionogel blended with Ag nanowires (AgNWs) is used as the active material of the MTEGs, and it is a mixed ion-electron conductor because the ionic liquid is an ionic conductor while the AgNWs can form electronically conductive networks. The MTEGs can supply a steady output voltage to the external load under steady temperature gradient, and the behavior is similar to that of the conventional TEGs. The thermopower can be 10.3 mV/K, higher than that of TEGs with electronic materials by 1-2 orders in magnitude. The operation mechanism of the MTEGs is attributed to the electron tunneling across the AgNWs and the Soret effect of the ions.

The phase transition mechanism of isotactic polybutene-1 (iPB-1) has always been a central research topic in the fields of polymer physics and industrial application. Phase transition kinetics of the flow-induced oriented form II is significantly faster than the isotropic form II that crystallizes under quiescent condition. In this study, combining the in situ X ray diffraction technique and a homemade extensional rheometer, the influence of amorphous region on the transformation kinetics was been investigated. Results indicated that annealing above the melting temperature (Tm) decreased the phase transition rate, while annealing below the Tm exhibited no obvious impact on the phase transition rate when the annealing time was only 5 min. However, prolonging the annealing time significantly reduced the phase transition kinetics. Remarkably, the crystallinity remained constant during the annealing process, while it exhibited an increase during the subsequent cooling process. The SAXS measurements showed that long spacing decreased after annealing. It is speculated that extended chains in the amorphous region are relaxed and shortened during the annealing process. This work recommends the rapid cooling of iPB-1 products in industrial manufacturing to prevent the relaxation of amorphous chains and promote the phase transition process.

Passive radiative cooling fabrics with high solar reflectance and mid-IR emissivity hold great promise for personal cooling applications. Nevertheless, most current passive radiative cooling fabrics overlook their inherent thermal conductivity, resulting in ineffective heat transfer from human skin to the environment. Herein, by constructing highly anisotropic thermal conductive thermoplastic polyurethane/boron nitride nanosheet (TPU/BNNS) fabrics via one-step electrospinning, thermal conductive cooling mechanism was introduced into passive radiative cooling fabrics. The stacked TPU/BNNS nanofibers with aligned BNNS along the fiber direction and the porous fiber network with high contact thermal resistance resulted in high thermal conductivity along the in-plane direction but low thermal conductivity along the out-of-plane direction. This high anisotropy enables rapid heat transfer along the in-plane direction to dissipate heat while blocking external heat penetration along the out-of-plane direction, thus achieving an effective conductive cooling effect. Moreover, the incorporation of BNNS increased the scattering sites for solar radiation, further improving the fabric’s solar reflectivity to 95

The influence of melt structure on the polymorphic selection during recrystallization of isotactic polybutene-1 (iPB-1) was investigated with differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) measurements in this work. The melt with varying ordered structures was prepared by controlling the melt temperature (Tme). The result revealed a significant memory effect on the polymorphic selection in recrystallization, which recrystallized into form I ' or II depending on Tme and the initial crystallization temperature of the sample. The Tme range, which was commonly divided into three Domains (Domains I, II, and III) according to the recognized rule, was re-divided. Where the Domain III was further divided into three regions while Domain II was further divided into two regions based on the melting of initial form I and the polymorphic selection in recrystallization. To be specific, only the initial crystal form I is observed in Domain IIIc; form I ' generated in Domain IIIb; while in Domain IIIa, a mixture of forms I ' and II formed; when Tme reaches Domain IIb, the melt crystallize into form II while no formation of form I ' is observed; in Domain IIa, where only form II is shown, the initial crystal form I is not observed. Samples with different initial crystallization temperatures exhibit significant variations in the specific boundary temperatures of Domains, which may be attributed to the lamellar thickness and its distribution in the initial crystals. Overall, the polymorph selection is attributed to the heterogeneous melting of the initial lamellae.

Stretchable conductive fibers are essential for the advancement of wearable electronic textiles. However, a significant challenge arises as their conductivity sharply decreases when stretched due to disruptions in electronic transport. Coating fibers with soft liquid metal (LM) has emerged as a promising solution. Despite this, there remains an urgent need to develop methods that enhance LM adhesion to substrates while facilitating efficient electron transport pathways. This study demonstrates a novel Ag-LM conductive network strategy for fabricating a thermoplastic polyurethane/polydopamine/silver-LM (TPU/PDA/AgLM) fiber membrane. This membrane exhibits outstanding stretchable electromagnetic interference (EMI) shielding performance and is produced through straightforward electrospinning, electroless depositing, and LM coating and activation. The TPU/PDA/Ag fiber membrane is initially prepared via polydopamineassisted deposition of silver nanoparticles (AgNPs) on electrospun TPU fibers. The presence of AgNPs on the surface of TPU/PDA fibers enhances LM adhesion to the substrate and bridges adjacent LM to establish efficient conductive paths. This interaction benefits from the reactive alloying between AgNPs and LM, where the LM infiltrates the gaps among AgNPs, forming a distinctive LM-Ag alloy layer that uniformly coats the surface of TPU fibers. As anticipated, the unique three-dimensional (3D) interconnected LM-Ag conductive network remains intact during stretching, ensuring strain-invariant conductivity. The fabricated TPU/PDA/Ag-LM fiber membrane demonstrates exceptional EMI shielding effectiveness (SE) of 77.4 dB within the frequency range of 8.2-12.8 GHz and maintains an excellent EMI SE of 37.2 dB under extensive tensile deformation of 300 %. Furthermore, the TPU/PDA/Ag-LM fiber membrane shows remarkable mechanical properties and stable Joule heating performance even under significant stretching. (c) 2025 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

Durable and multifunctional electromagnetic interference (EMI) shielding materials have garnered significant attention due to their growing application demands. However, achieving optimal EMI shielding performance remains challenging, primarily due to the inherent interfacial resistance among conductive fillers. In this study, a novel polyimide@silver-sintered (PI@Ag-S) nanofiber composite was developed through in situ anchoring and low-temperature sintering of Ag nanoparticles (AgNPs) on electrospun PI nanofibers. The sintering process created a highly interconnected AgNPs layer, significantly reducing the electrical resistance and enhancing the electrical conductivity from 49 S/cm to an exceptional 154 S/cm. The resulting PI@Ag-S nanofiber composite demonstrated outstanding EMI shielding effectiveness (86.7 dB), and a remarkable SSE/t value of 14985 dB cm2 g-1, alongside excellent in-plane thermal conductivity (2.6011 W/(m.K)). Additionally, the composite showcased superior electrical heating performance, enabling effective defogging and de-icing operations at a low voltage of 1.5 V. Notably, the composite, protected by an ultrathin 8 mu m PI coating, exhibited exceptional durability, including resistance to extreme temperatures, strong acid and alkali corrosion, and flame-retardant properties. These attributes make the flexible PI@Ag-S nanofiber composite a promising candidate for advanced EMI shielding and thermal management applications, particularly in harsh environments.

Electrospun fabrics enable efficient passive radiative cooling through their porous, solar-scattering structure and spectral selectivity, making them promising for personal thermal regulation. However, relying solely on radiative cooling may be insufficient under varying environmental conditions. Herein, an PVDF/BNNS fabric with integrating heat conduction cooling with passive radiative cooling was fabricated via one-step electrospinning for multi-scenario all-day thermal regulation. On the one hand, the alignment of BNNS within PVDF fibers establishes in-plane thermal conduction pathways, whereas the significant interfacial thermal resistance across stacked fibers in the out-of-plane direction induces highly thermal conduction anisotropy, thereby achieving excellent conduction cooling ability for the PVDF/BNNS fabric. On the other hand, the high-refractive-index BNNS serves as highly efficient light-scattering centers, boosting the solar reflectance of PVDF/BNNS porous fabric to 87.7 %. Simultaneously, it eliminates the emissivity dip of PVDF within the atmospheric transmission window, maintaining it consistently above 90 %. Consequently, the PVDF/BNNS fabric demonstrates all-day passive personal cooling capability with reducing the simulated skin temperature by 8 degrees C under a solar irradiance of approximate to 378 W m-2 during daytime and by 6 degrees C at night. Additionally, the fabric maintains breathability, hydrophobicity, and flexibility, making it a practical zero-energy solution for diverse outdoor environments.

Flexible piezoelectric sensors have received extensive attention for wearable real-time human motion monitoring applications due to their self-powered capacity, wearability, and lightweight properties. However, developing piezoelectric sensors with both high sensitivity and substantial voltage outputs remains challenging. This study presents an innovative yet straightforward approach to fabricate high-performance piezoelectric flexible textiles by stretching electrospun oriented PVDF nanofiber (SO-PVDF). The macroscopic alignment of the PVDF nanofiber prevents fiber flipping and sliding during stretching, enabling efficient transfer of mechanical strain to molecular chains. This results in a remarkable improved relative content of beta crystal of 95.1%, representing high piezoelectric performance. The resulting PVDF yarn shows good mechanical strength, overcoming the typical fragility limitations of electrospun materials. The assembled piezoelectric generators (SO-PEG) show high piezoelectric performance, including substantial voltage outputs (27 V), high sensitivity (0.93 V/N), rapid response time (T-r = 93 ms, T-f = 84 ms), and good operational stability (>2000 cycles). Furthermore, the SO-PEG serves as a versatile self-powered sensor capable of detecting both small movement (finger bending) and large-scale movements (elbow, knee, and foot movement) based on efficient mechanical-to-electrical energy conversion. Overall, this work provides a cost-effective and scalable strategy for manufacturing high-performance wearable piezoelectric sensors, opening possibilities for intelligent biomonitoring applications.

Flexible piezoelectric sensors exhibit significant potential for applications in human motion monitoring, human-computer interaction, and intelligent robots, attributed to their self-powered nature and simplified wearable architecture. In addition to the developed sensitivity and output voltage of piezoelectric sensors, large-scale production is a critical prerequisite for their widespread commercialization. In this study, we report a novel method of preparing piezoelectric smart PVDF fabric via melt spinning and post-stretching. The transformation mechanism from nonpolar alpha phase to polar beta phase over a wide temperature range (80-130 degrees C) was thoroughly investigated using WAXD, DSC and FTIR techniques. The findings reveal an inverse relationship between stretching temperature and phase-transformation kinetics: higher temperatures notably slow down the alpha to beta crystal conversion, necessitating larger tensile strain for achieving comparable transformation degrees. Furthermore, multi-step destruction of the alpha crystal at high temperatures was observed, with preferential damage to (100) and (110) crystallographic planes before (020) and (021) planes that exhibited greater stability. Based on these insights, optimal post-stretching temperatures were determined for fabricating PVDF fiber. As demonstrated, piezoelectric generators assembled by PVDF fabric show exceptional performance, including piezoelectric output (26.3 V), high sensitivity (0.167 V/kPa), short response time (T-r = 30 ms, T-f = 34 ms), and long-term stability (>2000 cycles), making them ideal self-powered sensor for multimodal intelligent biomonitoring of human movement and handwriting monitor. This research provides a cost-effective and facile pathway for the scalable fabrication of high-performance, flexible, wearable piezoelectric sensors.

Developing stretchable electromagnetic interference (EMI) shielding wearable fabrics is crucial in light of the increasing electromagnetic pollution. However, achieving satisfactory stretchable shielding ability is challenging due to the significant difference in modulus between the elastic matrix and rigid conductive network. In this study, a dual wrinkled conductive network with macro-wrinkles on the surface of fabric and micro-wrinkles on the surface nanofiber was constructed by in situ anchoring silver coating onto a pre-stretched thermoplastic polyurethane (TPU) electrospinning fabric. The unique geometric dual-wrinkled structure not only enhances the EMI shielding performance from 57.9 dB to 77.8 dB by reinforcing multiple reflecting/scattering. More importantly, it can protect the conductive network from damage during stretching, achieving stretchable EMI shielding performance with maintaining effective shielding of 36 dB under 100 % tensile deformation. Notably, the EMI shielding performance can be restored to the initial level after strain recovery and still holds over 65 dB even after cyclic stretching for 500 times. Additionally, the dual-wrinkled structure imparts stretchable Joule heating and photothermal conversion abilities to the fabric enabling controllable personal thermal management. With its excellent hydrophobicity, gas permeability, and mechanical stretchability, the dual-wrinkled EMI shielding fabric holds significant prospects for the next generation of wearable electronics.

Polyethylene fibers (PEFs) with high inherent thermal conductivity have been proved to be able to prepare fully organic thermally conductive composites. Herein, the effect of macroscopic fiber orientation and microscopic molecular chain orientation on the thermal conductivity of PEF composites was investigated. Specifically, four kinds of PEFs (PENT, PESF, U1PEF, U2PEF), were selected to prepare fully organic thermally conductive composites. The morphology results show that PENT distributed randomly and loosely in the composite, while the other three PEFs showed high orientation stacking arrangement. As a result, PENT composite shows a low thermal conductivity of 0.132 W/mK due to the absence of effective heat transfer channels and the serious phonon scattering at matrix-to-fiber interfaces. By comparison, the parallel arrangement of continuous fiber provides an ideal channel for phonon transport, so that PESF composite has substantial increase in thermal conductivity (6.543 W/mK). Furthermore, U1PEF and U2PEF composites with higher chain orientation and crystallinity in the inner of fibers, thus reveal the higher thermal conductivities of 11.07 and 15.48 W/mK. Therefore, it can be concluded that not only the fiber orientation distribution, but also the chain orientation structure of fibers both have an important influence on the thermal conductivity of PEF composites.

In order to maintain the human body temperature within a comfortable range in harsh environments, flexible and wearable thermal management fabrics that can combine energy storage and multi-modal heat recharging ability are urgently needed. Here, a strategy of coaxial electrospinning and spray coating was proposed to prepare the MXene-coated core-sheath phase change fibers to satisfy the above requirement. The hierarchical structure endows the composite film with phase change energy storage and photo/electro-thermal multi-modal heat charging performance. Specifically, the encapsulated paraffin wax (PW) in flexible polyurethane (PU) fibers has a high enthalpy value of 91.7J/g, meanwhile, the flexible film exhibits excellent photo-thermal performance conversion capability (up to 40oC under the irradiation intensity of 30mW/cm2) and electro-thermal conversion capability (up to 40oC at the voltage of 1.5V) at extremely low MXene loading (0.23mgcm-2), which endows the MXene/PU@PW (MPP) ability of “heat recharging” by low light power density or low voltage. The multifunctional fabrics with phase change function and multi-modal heat recharging capacity exhibit great potential application in the design of wearable personal thermal management.

Electromagnetic interference (EMI) shielding fabrics are crucial in addressing the increasingly serious electromagnetic pollution. To meet wearable requirements, stretchability and thermal comfortability are often desired, but which still are challenging. Herein, a stretchable EMI shielding fabric is fabricated via electrospinning coupled with biaxial pre-stretching spraying, in which a block stacking wrinkled silver nanowire (AgNW)/Ti3C2Tx MXene network is coated on one side of electrospun thermoplastic polyurethane (TPU)/polydimethylsiloxane (PDMS) fabric. As expected, the wrinkled structure protects conductive network from fracture during stretching process, so as to realize the strain-invariant electrical conductivity. Thus, the fabric exhibits a stretchable EMI shielding performance of over 40 dB when subjected to 10-50% uniaxial strains or 21-125% biaxial strains. More importantly, the white TPU/PDMS side and the black AgNW/MXene side enable the fabric passive radiative cooling and heating, respectively. The cooling side exhibits high mid-infrared emissivity (97.5%) and solar reflectance (90%), thus reducing the skin temperature by approximate to 4.9 degrees C. The heating side with high solar absorptivity (86.6%) and photothermal effect increased the skin temperature by approximate to 5 degrees C. Therefore, the fabirc with stretchable EMI shielding and Janus-type dual-mode personal passive thermal management is promising in future wearable products. A Janus-type electrospun TPU/PDMS fabric containing block stacking wrinkled AgNW/MXene conductive network is fabricated via biaxial pre-stretching method. The wrinkled conductive network gives the fabric a strain-invariant EMI shielding performance of over 40 dB. Meanwhile, the Janus-type white TPU/PDMS side and black AgNW/MXene side enable the fabric passive radiative cooling and heating, i.e., dual-mode passive personal thermal management ability.image

Tensile deformation in the post processing of polymer plays a critical role in determining its mechanical properties. In this work, we investigated the structure evolution of high-density polyethylene/hexagonal boron nitride (HDPE/h-BN) composite during stretching in a wide temperature range from 25 degrees C to 100 degrees C in order to reveal the suitable post processing temperature of HDPE/h-BN composites fiber. The structure transition of HDPE crystal and the distribution of h-BN were investigated by in-situ small-angle X-ray scattering (SASX), in-situ wideangle X-ray diffraction (WAXD) measurements, and scanning electron microscopy (SEM). The result shows that the parent HDPE crystal would be broken and recrystallize into highly oriented daughter crystal along the tensile direction when the tensile temperature (Tten) is in the range from 70 degrees C to 100 degrees C, though the recrystallization rate is low at high Tten. When Tten is low (25 degrees C), the crystallinity decreases continuously as no recrystallization takes place. In addition, the h-BN migrates accompany with the HDPE matrix and becomes oriented during the tensile direction. Combining the result of WAXD, SAXS, and the SEM measurement, it is concluded that the temperature of 70 degrees C is suitable for post processing of the HDPE/h-BN composite fiber.

Most enzyme catalysts are unable to achieve effective oxidation resistance because of the monotonous mimicking function or production of secondary reactive oxygen species (ROS). Herein, the Au@Cu2O heterostructure with multienzyme-like activities is deigned, which has significantly improved antioxidant capacity compared with pure Cu2O for the scavenging of highly cell-damaging secondary ROS, i.e.,·OH. Experiments and theoretical calculations show that the heterostructure exhibits a built-in electric field and lattice mismatch at the metal-semiconductor interface, which facilitate to generate abundant oxygen vacancies, redox couples, and surface electron deficiency. On the one hand, the presence of rich oxygen vacancies and redox couple can enhance the adsorption and activation of oxygen-containing ROS (including O2·- and H2O2). On the other hand, the electron transfer between the electron-deficient Au@Cu2O surface and electron donor would promote peroxide-like activity and avoid producing ·OH. Importantly, endogenous ·OH could be eliminated in both acidic and neutral conditions, which is no longer limited by the volatile physiological environment. Therefore, Au@Cu2O can simulate superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), and glutathione peroxidase (GPx) to form a complete antioxidant system. The deigned nanoenzyme is explored in the real sample world such as A549 cells and zebrafish. This work provides theoretical and practical strategies for the construction of a complete antioxidant enzyme system.

In this work, the memory effect on the phase transition from form II to I of isotactic polybutene-1 (iPB-1) in the flow field is studied with in situ wide-angle X-ray diffraction (WAXD) techniques combined with a homemade two-drum extensional rheometer. Heterogeneous melt containing residual form II seeds was prepared by heating the form II crystal to different melting temperatures (Tm). The results show that the memory effect has a limited contribution to the phase transition kinetics without melt extension. However, the memory effect can be activated by a flow field. The phase transition kinetics shows obvious dependence on Tm, which increases with the decrease of Tm. In addition, the result shows that the melt memory and flow field mainly accelerate the nucleation rather than the growth of form I. As form II with a high orientation degree is induced in the flow field, it is speculated that the higher nucleation rate of form I during phase transition is attributed to the large number of tie molecules distributed in the oriented form II lamellae, which promote the nucleation of form I. In summary, the coupling of memory effect and melt extension plays an essential role in accelerating the phase transition of iPB-1.