In this work, alkyd resin and 3-glycidyloxypropyl-polyhedral oligomeric silsesquioxanes were synthesized from castor oil and siloxane, respectively, and used to as the modifier of the epoxy resins. Laminate of fiberglass-reinforced composite were prepared from alkyd-epoxy resin with different 3-glycidyloxypropyl-polyhedral oligomeric silsesquioxanes content. The properties of nanocomposite were characterized. The results showed that the 3-glycidyloxypropyl-polyhedral oligomeric silsesquioxanes could increase the impact strength of nanocomposite. When the content of 3-glycidyloxypropyl-polyhedral oligomeric silsesquioxanes is 6 wt% of the alkyd resin, the T-g enhances to 5.2 degrees C, the impact strength increases to 53.01 kJ/m(2) (64%), but the tensile strength decreases 15.03 MPa (7.6%). Nanocomposite has good electrical properties and insulating properties. [GRAPHICS] .

The methyl acryloyloxy propyl silsesquioxane(MAP-POSS) was prepared by hydrolysis condensation of KH-570, and composing free radical-cationic hybrid UV curing system with the unsaturated epoxy resin. The changes of characteristic absorption peak in the curing process was characterized by using infrared spectroscopy (FT-IR), and the influence of MAP-POSS content on the surface water contact angle, silicon elements distribution, mechanical properties and thermal performance of UV-cured film was investigated. The results show that with the addition of MAP-POSS the crosslinking degree, hydrophobicity, thermal stability and glass transition temperature(T-g) of the film are improved. When the content of MAP-POSS is 12 % (mass fraction, the same below), T-g is increased by 16. 9 degrees C. When the MAP-POSS content is 15%, the water contact angle of film is increased from 58. 0 degrees to 94. 2. The impact strength is improved firstly and then decreased with the addition of MAP-POSS.

In order to prepare the bio‐based polymeric materials, a gallic acid epoxy resin (GA‐ER) is synthesized by using biodegradable gallic acid, and the nanocomposites of GA‐ER/glycidyl methacrylate (GMA)/multiwalled carbon nanotubes (MWCNTs) were prepared by dual hybrid cationic ring‐opening reaction. Differential scanning calorimetry (DSC) results show that the curing reaction temperature of the nanocomposites is between 150 and 225°C. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results suggest that MWCNTs are homodispersing in the GA‐ER/GMA matrix when the MWCNTs content is not more than 1.0 wt%. The glass transition temperature of the nanocomposite with 0.5 wt% MWCNTs is 9.3°C higher than that of pure resin system. The initial thermal degradation temperature and degradation activation energies E a of the nanocomposite with 1.0 wt% MWCNTs is 10°C and 68.6 kJ/mol higher than that the pure resin system, respectively. POLYM. COMPOS., 37:3093–3102, 2016. © 2015 Society of Plastics Engineers

Boron-containing bisphenol-S formaldehyde resin (BBPSFR) with different amounts of nano-SiO2 by in situ formation was used to cure o-cresol formaldehyde epoxy resin (o-CFER). The curing kinetics, dynamic mechanical properties, and thermal stability of BBPSFR/o-CFER/nano-SiO2 composites (BCS) were investigated by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), thermogravimetry (TG), and thermogravimetrymass spectrometry (TGMS). Morphology of nano-SiO2-containing BBPSFR and glass fiber laminates of the BCS were characterized by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The mechanical properties and electrical properties were also determined. The results showed that nano-SiO2 accelerated the curing process and decreased the curing temperature; the non-isothermal curing kinetics of the BCS can be described by the two-parameter (m, n) Šesták-Berggren kinetic model, and the average value of m was 0.32 and n was 1.00. The thermal stability was enhanced by the addition of nano-SiO2, especially at higher temperatures, and the residual weight increased with increasing nano-SiO2 content. Incorporation of 6 wt% of nano-SiO2 increased the impact strength from 105 to 149 kJ/m2 and storage modulus at ambient from 6.85 to 12.7 GPa, and the TEM photograph of which showed that nano-SiO2 particles (about 50 nm) were dispersed in the matrix more uniformly. The volume resistance, R v, and dielectric constant, ε, slightly increased when the nano-SiO2 content was 3 wt%.

为了保护环境和利用可再生资源,文中合成了甲基丙烯酸马来海松酸环氧树脂（MREMA）和聚氨酯丙烯酸酯（PUA）,将MREMA和PUA按质量比1∶1进行UV固化反应,并用羟基多壁碳纳米管（HCNTs）改性制备纳米复合材料。利用红外光谱仪、热重分析仪、动态力学谱仪和漆膜测试仪等研究了碳纳米管对MREMA/PUA材料的热性能、动态力学性能以及涂膜性能的影响。结果表明,加入HCNTs可以明显改善材料的热性能和动态力学性能。加入0.5%HCNTs,材料的玻璃转化温度Tg达到173.4℃,与纯组分相比提高了64.6℃;加入0.7%HCNTs,材料的起始热分解温度提高了38.2℃。UV-光固化涂膜的硬度也因加入HCNTs而提高,且涂膜具有很好的物理化学性能。

合成了己二酸锌钙皂,并将纳米氧化铈和氧化镧分别作为共稳定剂制备了新型复合热稳定剂.采用刚果红法、热失重分析仪、动态力学分析仪等考查了复合热稳定剂对聚氯乙烯/丙烯酸酯-苯乙烯-丙烯腈接枝共聚物(PVC/ASA)共混材料的热稳定效果及动态力学性能.结果表明,稀土化合物作为共稳定剂可以提高己二酸锌钙皂对PVC/ASA共混材料的热稳定效果,氧化镧与己二酸锌钙皂的协同效果优于纳米氧化铈,而纳米氧化铈的加入可以提高材料的热变形温度.

Graphene oxide was reduced into reducing-graphene oxide (r-GO) successfully using gallic acid (GA) as a green reducing agent. Biobased gallic acid epoxy resin (GAER) was synthesized from renewable GA, and the biobased GAER/r-GO nanocomposites and glass fiber-reinforced composites were prepared with succinic anhydride as a curing agent. The dynamic mechanical, thermal, and mechanical properties of the composites with varying r-GO contents were characterized. When the content of r-GO was 0.5 wt%, the glass transition temperature was 10.4 degrees C higher than the pure resin system. The thermal and mechanical properties were increased with increasing r-GO content; when the r-GO content was 1.0 wt%, the initial degradation temperature was enhanced by approximately 6.8 degrees C, the tensile and impact strengths were 34.5% and 49.1% higher, respectively, than the pure cured GAER. The impact strength of GAER was higher than that of the bisphenol A epoxy resin/SUA curing system, but the tensile strength was lower than it.

In order to prepare bio-nanocomposites with no-cytotoxicity, the rosin-based epoxy resin (MPAER) and castor oil-based polyurethane (COPU) were synthesized and carbon nanotubes (CNTs) was used to enhance the properties of curing MPAER/COPU materials. The curing reaction, dynamic mechanical and thermal properties of this system were characterized by FTIR, NMR, DMA, TG et al. The cytotoxicity of materials is evaluated for HeLa cells using a MTT cell-viability assay. The results showed that COPU can cure MPAER and CNTs can increase effectively the properties of MPAER/COPU nanocomposites. The Tg of MPAER/COPU/CNTs has the highest value when CNTs content is 0.4wt%, which is 52.4 degrees C higher than the pure MPAER/COPU. Thermal stability of the nanocomposites is enhanced by the addition of CNTs, the initial decomposition temperature Td5 of the sample No. 0.4 has increased from 284.5 to 305.2 degrees C, which is 20.7 degrees C higher than No. 0. The impact strength of the No. 0.4 film is 15kgcm higher than the pure resin system. The survival rate of HeLa cells to the products is greater than 90% within 48 and 72h, which demonstrate that this material has excellent biocompatibility and no obvious cytotoxicity for HeLa cells, which may be used in the medical treatment.

Polyurethane acrylate (PUA) and o-cresol formaldehyde epoxy resin (o-CFER) is synthesized. The PUA/o-CFER glass fiber-reinforced composites cured by free radical/cationic ring-opening reaction are modified by the reducing graphene oxide (r-GO). Effect of r-GO on the thermal and mechanical properties of PUA/o-CFER glass fiber-reinforced composites are characterized by FTIR, DMA and TGA. The result of FTIR shows that the system has cured completely. DMA analysis indicates that this system has better compatibility, and the glass transition temperature (T g) decreases with increasing r-GO content. TGA analysis shows that the initial thermal degradation temperature (T id) and activation energy (E a) enhance 13.1 °C and 3.12 kJ/mol, respectively. The tensile and impact strength of glass fiber-reinforced composites are approximately 50 and 60 % higher than those without r-GO. It is shown that the r-GO can enhance the mechanical properties and thermal stability of composites.

松香与马来酸酐进行Diels-Alder反应合成马来海松酸酐(MPA),与环氧氯丙烷进一步反应生成松香基环氧树脂,以马来海松酸酐(MPA)做固化剂固化松香环氧树脂,利用差示扫描量热仪、动态力学谱仪、热重分析仪等分析手段,对该体系固化产物进行固化动力学和热降解动力学研究.结果表明,质量比为5∶5的环氧树脂/马来海松酸酐体系固化后玻璃化转变温度达53.2℃,平均固化反应活化能为52.29 kJ/mol;固化物在10℃/min时初始分解温度为211.9℃,最大分解温度为347.7℃,最终分解温度为639.0℃.

为改进酚醛固化环氧树脂复合材料的性能,合成了邻甲苯酚醛树脂（o-CFR）、邻甲酚醛环氧树脂（o-CFER）和氧化石墨烯（GO）,制备了o-CFR/o-CFER/GO玻璃钢复合材料,研究了不同含量的氧化石墨烯对复合材料物理力学性能的影响。结果表明,GO加入可以改善材料的力学性能、耐热性能和电绝缘性能。当酚醛与环氧质量比为4∶6,材料中加入1.2%的GO时,起始分解温度（Tid）提高了91℃,复合材料的拉伸强度和冲击强度分别提高了102%和86%;加入2.0%时材料玻璃化转变温度（Tg）可提高19℃。

Polyvinylchloride (PVC)/poly(acrylonitrile–styrene–acrylate) (ASA)/multi-walled carbon nanotubes (MWCNTs) nanocomposites were prepared. The plasticizing behavior, dynamic mechanical properties, mechanical properties and thermal stability of the nanocomposites were studied. The results demonstrate that the plasticizing time shortens as the MWCNTs content increases. The nanocomposites show the best impact strength, which is 83.7 % higher than pure PVC/ASA blend and is 2.1 times higher than pure PVC, when the MWCNTs content is 0.054 wt%. MWCNTs can enhance the thermal stability of PVC/ASA blends; the initial decomposition temperature (T id) and thermal degradation activation energy (E a) increase by 13.1 °C and 5.7 kJ mol−1, respectively, when the MWCNTs content is 0.066 wt%. The storage modulus (E ′) and glass transition temperature (T g) also increase when MWCNTs are added. MWCNTs can be used as an efficient toughening modifier and processing aid for PVC/ASA blends.

Core-shell nanocomposites were prepared from acrylates, fluorine- containing methacrylate monomers and methylacryloypropyl polyhedral oligomeric silsesquioxanes (MAP-POSS) by emulsion polymerization. The properties of latex and nanocomposites were characterized by FTIR, NMR, TEM, laser particle diameter analyzer, DMA and TGA. The results showed that the particle diameter of composite latexes was about 33.5nm, dynamic mechanical loss peak temperature T-p of the nanocomposites had the best high value at 99.6 degrees C when 7wt.% MAP-POSS was added, which is 7.8 degrees C higher than the pure polyacrylates. MAP-POSS could increase the thermal stability of materials, the initial thermal decomposition temperature increases about 34 degrees C.

合成了具有不同甲基丙烯酰氧丙基笼型倍半硅氧烷(MAP-POSS)含量和不同芯壳比的丙烯酸酯芯壳聚合物(ACR)树脂,并用透射电子显微镜研究了ACR乳胶粒子的形态;用动态力学谱仪研究了聚氯乙烯(PVC)/ACR共混物的动态力学性质;测试了PVC/ACR共混物的塑化行为和力学性能.结果表明,MAP-POSS在ACR芯中参与接枝和交联反应;MAP-POSS加入量为单体质量5％和10％时,壳层有最高的玻璃化转温度;芯/壳比为1∶1时,ACR粉末效果较好;PVC/ACR共混物材料塑化时间随ACR的含量增加而缩短,而塑化扭矩增大;ACR加入量为m(ACR)/m (monomer)=11/100时共混材料具有最大的冲击强度,较未加时提高了72.9％,比不合增塑剂的纯PVC提高了3.41倍.

Boron-containing bisphenol-S formaldehyde resin (BBPSFR) with different amounts of carbon nanotubes (CNTs) was used to cure o -cresol formaldehyde epoxy resin ( o -CFER). The curing kinetics, dynamic mechanical properties, and thermal stability of BBPSFR/ o -CFER/CNTs (BCC) composites were investigated by DSC, DMA, and TGA. The morphology of BCC composites was characterized by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The mechanical properties and electric properties were also determined. The results showed that the glass transition temperature T g , initial decomposition temperature T id all increased with increasing CNTs content. The T g and T d5 is about 20°C and 30°C higher than that of pure BBPSFR/ o -CFER (BC), when content of CNTs is 1.5 wt%. The curing reaction active energy Ea can be calculated by Kissinger’s method. When the conversions α is between 0.15 and 0.95, E a has a slight increase for the BBPSFR/ o -CFER (BC) composite, but it exhibits slight decrease for the BCC composites. The non-isothermal curing kinetics of the BCC can be described by the two-parameter ( m, n ) Šesták-Berggren kinetic model. The BCC has the highest tensile and impact strength when contains of CNTs is 1.0 wt%, which is 34 MPa and 13 kJ/m 2 higher than that of pure BC laminate, respectively. The electric properties of BCC laminates were improved by the addition of 1.0 wt% CNTs.

ABSTRACT In this study, the gallic acid‐based epoxy resin (GA‐ER) and alkali‐catalysed biphenyl‐4,4′‐diol formaldehyde resin (BPFR) are synthesized. Glass fibre‐reinforced GA‐ER/BPFR composites are prepared. Graphene oxide (GO) is used to improve the mechanical and thermal properties of GA‐ER/BPFR composites. Dynamic mechanical properties and thermal, mechanical, and electrical properties of the composites with different GO content are characterized. The results demonstrate that GO can enhance the mechanical and thermal properties of the composites. The glass transition temperature, T g , of the BPFR/GA‐ER/GO composites is 20.7°C higher than the pure resin system, and the 5% weight loss temperature, T d5 , is enhanced approximately 56.6°C. When the BPFR: GA‐ER mass ratio is at 4 : 6 and GO content is 1.0–1.2 wt %, the tensile and impact strengths of composites are 60.97 MPa and 32.08 kJ/m 2 higher than the pure resin composites, respectively. BPFR/GA‐ER composites have better mechanical properties, and can replace common BPA epoxy resins in the fabrication of composites. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42637.

Glycidyloxypropyl-polyhedral oligomeric silsesquioxanes (G-POSS) were prepared from 3-glycidyloxypropyl-trimethoxysilane (GTMS) by hydrolytic condensation. The hybrid cationic thermal polymerization of G-POSS with bisphenol A epoxy resin (E-51) using diphenyliodonium fluoride borate (DPI·BF4) as a cationic initiator and benzoyl peroxide (BPO) as a co-initiator was investigated by DSC and FTIR. The structure of G-POSS was characterized by liquid chromatography–mass spectrometry (LC/MSD), FTIR and NMR. The effect of BPO content on reaction system, the distribution of G-POSS in the curing system, curing reaction activation energy E a and dynamic mechanical properties of the E51/G-POSS nanocomposites were characterized. The results showed that octa(3-glycidyloxypropyl)-POSS (G-POSS) had been synthesized and displayed uniform dispersion in E51/G-POSS curing system. The DPI·BF4, which was capable to initiate the thermal ring-opening curing of epoxy resin, showed an initial curing temperature of epoxy resin decreased by 54.7 °C when the added amount of BPO was 2 wt%. The reaction process was well accorded with Kissinger’s kinetics model, and the average curing reaction activation energy E a was increased as the content of G-POSS increased. The T g and storage modulus of the E-51/G-POSS nanocomposites reached its optimum when the content of G-POSS was 2 wt%. The T g of nanocomposite was 8.3 °C higher than that of the pure epoxy resin. The T g and storage modulus decreased with the further increasing of G-POSS content.