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Unsaturated polyester (UP)/montmorillonite (MMT) nanocomposite was prepared by using hydroxypropylacrylate (HPA) as a reactive diluent instead of conventional styrene monomer and the effect of polarity of reactive diluent on properties of nanocomposite was investigated. X‐ray and mechanical test data indicated that mixing for an extended period of time is essential to enhance the physical properties of nanocomposites in the UP/Cloisite 6A system. This was attributed to the high polarity of HPA that may disturb the preintercalation of UP resin into the galleries of MMT. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 238–242, 2004 相似文献
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NR/有机蒙脱土/GMA纳米复合材料的制备与性能研究 总被引:5,自引:0,他引:5
采用胶乳接枝插层法制备NR/有机蒙脱土/甲基丙烯酸缩水甘油酯(GMA)纳米复合材料,并对其性能进行研究。结果表明,在NR胶乳与有机蒙脱土体系中加入GMA,并使之原位聚合,同时实现对NR的接枝和对有机蒙脱土的插层并与有机蒙脱土层间的基团产生化学结合,可以制备NR/有机蒙脱土/GMA纳米复合材料;采用胶乳接枝插层法制备的NR/有机蒙脱土/GMA纳米复合材料的物理性能和耐热氧老化性能优异,动态力学性能良好,热稳定性与NR胶料相差不大。 相似文献
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Unsaturated polyester/montmorillonite nanocomposites with improved mechanical and thermal properties fabricated by in situ polymerization 下载免费PDF全文
Although organically modified montmorillonite (OMMT) has been incorporated into unsaturated polyester (UP) resin to enhance properties, the aggregation often leads to defects which directly affect the properties of nanocomposites. In this work, OMMT slurry modified by a new allyl surfactant with carbon–carbon double bond, hexadecyl allyl dimethyl ammonium chloride (C16‐DMAAC), was employed to prepare nanocomposites by in situ polymerization. The results illustrated that the existence of OMMT slurry helped monomers enter the OMMT galleries, leading to well‐dispersed OMMT in the UP matrix. The mechanical properties and thermal properties of OMMT nanocomposites were improved. With OMMT loading of 5 wt %, the tensile strength and flexural strength can be improved by 22% and 38%, respectively. Meanwhile, the onset thermal decomposition temperature (T–10) value was ameliorated from 310.6 °C to 330.6 °C. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 45251. 相似文献
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利用与天然纤维具有良好亲和性的聚酯聚氨酯(PU)改性不饱和聚酯(UP),通过扫描电镜(SEM)、傅里叶红外光谱(FT-IR)、接触角和力学性能等,研究了改性不饱和聚酯的微观结构、反应程度和主要性能.研究结果表明,引入PU提高了不饱和聚酯树脂的韧性,增加了与天然纤维的界面浸润性,降低了不饱和聚酯树脂的固化收缩率.所得改性不饱和聚酯的冲击断裂截面表现为韧性断裂;与天然纤维的接触角随着聚氨酯添加量的增加而降低,表明改性不饱和聚酯与天然纤维的浸润性增强.力学性能测试表明,当PU含量为5%时,其冲击强度可提高80%,弯曲模量降低小于20%,固化收缩率低于4%. 相似文献
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简要介绍了聚氯乙烯/蒙脱土纳米复合材料的有机改性机理和制备方法,重点阐述了聚氯乙烯/蒙脱土纳米复合材料的研究进展。 相似文献
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Mengwei Jiang Yunshu Zhang Yuan Yu Qingwu Zhang Bujun Huang Zhiquan Chen Tingting Chen Juncheng Jiang 《应用聚合物科学杂志》2019,136(11):47180
Ammonium polyphosphate (APP) was modified using a new method, where the resulting modified APP (MAPP) was obtained by mixing APP with unsaturated polyester resin (UPR). MAPP was more effective in improving the flame retardancy of UPR than APP which was due to the improved dispersion of MAPP in UPR composite. Then, the UPR composites were prepared based on dimethyl methylphosphonate, MAPP, montmorillonite, and zinc borate. Finally, the flame-retardant and mechanical properties of the UPR composites were analyzed using the limited oxygen index (LOI), thermogravimetric analysis, UL-94 vertical burning test, scanning electron microscopy, cone calorimetry, mechanical tests, and viscosity measurements. The LOI and UL-94 tests showed that the flame-retardant properties clearly improved with the addition of fillers in the UPR composites compared to pristine UPR. The synergistic effect of Si- and P-containing flame retardants in this composite resulted in the LOI value increasing from 18.9 to 31.3% and achieved the UL-94 V-0 rating. Moreover, the heat release rate was lower than the pristine UPR. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47180. 相似文献
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DSC thermal analysis and X‐ray diffraction have been used to investigate the isothermal crystallization behavior and crystalline structure of nylon 6/clay nanocomposites. Nylon 6/clay has prepared by the intercalation of ε‐caprolactam and then exfoliating the layered silicates by subsequent polymerization. The DSC isothermal results reveal that introducing saponite into the nylon structure causes strongly heterogeneous nucleation induced change of the crystal growth process from a two‐dimensional crystal growth to a three dimensional spherulitic growth. But the crystal growth mechanism of nylon/montmorillonite nanocomposites is a mixed two‐dimensional and three‐dimensional spherulitic growth. The activation energy drastically decreases with the presence of 2.5 wt % clay in nylon/clay nanocomposites and then slightly increases with increasing clay content. The result indicates that the addition of clay into nylon induces the heterogeneous nucleation (a lower ΔE) at lower clay content and then reduces the transportation ability of polymer chains during crystallization processes at higher clay content (a higher ΔE). The correlation among crystallization kinetics, melting behavior, and crystalline structure of nylon/clay nanocomposites is also discussed. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 2196–2204, 2004 相似文献
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N-苯马来酰亚胺改性不饱和聚酯树脂 总被引:6,自引:0,他引:6
研究了N-苯基马来酰亚胺(NPMI)在苯乙烯中的溶解规律,即NPMI在苯乙烯中溶解度呈线性关系:5~35℃时,S=0.1t;40~60℃时,S=4.2+2.2t。NPMI的引入可以有效提高不饱和聚酯(UP)树脂的耐热性,NPMI用量在1%~9%,可以将UP树脂的热变形温度提高4.5℃。研究了NPMI用量对UP树脂浇注体拉伸强度和冲击强度的影响,对材料冲击断面进行了SEM表征。NPMI用量为2%时,材料的拉伸强度最大,提高了5.5%,达到67.3 MPa;NPMI用量为6%时,材料的冲击强度最大,提高了23%,达到8.6 kJ/m2。 相似文献
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环氧树脂/蒙脱土纳米复合材料的制备与性能 总被引:1,自引:0,他引:1
重点综述了影响蒙脱土片层在环氧基体中剥离的主要因素。根据环氧树脂/蒙脱土纳米复合材料的结构特点,解释了其力学性能、热性能、耐腐蚀和阻隔性能得到明显改善的原因。 相似文献
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Wayne D Cook Michelle Lau Mansour Mehrabi Katherine Dean Marcus Zipper 《Polymer International》2001,50(1):129-134
The curing behaviour of an unsaturated polyester resin has been studied by gel time and pseudo‐adiabatic exotherm measurements. The gel time corresponded closely with the initial rise in exotherm temperature. Incorporation of tert‐butyl catechol inhibitor increased the gel time in a linear fashion and the exotherm was similarly delayed. An increase in the concentrations of initiator (either methyl ethyl ketone peroxide or acetyl acetone peroxide) or cobalt octoate accelerator decreased the gel time in a reciprocal fashion and increased the rate of polymerization. These results are fitted to a theoretical model for inhibition and initiation. © 2001 Society of Chemical Industry 相似文献
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具有高伸长率的二异氰酸酯改性不饱和聚酯 总被引:1,自引:0,他引:1
介绍了1种新型二异氰酸酯改性不饱和聚酯,该树脂可以室温固化,固化后树脂的拉伸强度和断裂伸长率分别可达20 MPa和106%。该树脂可用于制作高柔韧性制品,亦可以加入到其他不饱和聚酯中,提高其冲击性能和断裂伸长率。 相似文献
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苯乙烯对不饱和聚酯树脂性能的影响 总被引:3,自引:0,他引:3
本文主要探讨了不饱和聚酯中应用得最广泛的活性稀释剂——苯乙烯,对不饱和聚酯树脂机械性能、电性能、吸水性、耐化学性等的影响,从而为实际生产中采用最佳的苯乙烯含量提供参考。 相似文献
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简要叙述了蒙脱石的结构;综述了阳离子表面活性剂插层蒙脱石以形成有机蒙脱石的机理、插层方法以及阳离子表面活性剂的结构对被插层蒙脱石的层间距的影响;讨论了不同类型的聚合物/蒙脱石纳米复合材料制备方法;同时比较了所得到的纳米复合材料的力学性能、热性能与纯聚合物的力学性能和热性能。结果表明:前者的力学性能和热性能比后者均有较大程度的提高。最后提出了聚合物/蒙脱石纳米复合材料目前存在的问题、发展方向和应用前景等。 相似文献
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综述了近年来废旧不饱和聚酯制品的回收利用技术进展,对几种主要的回收方法:化学回收(包括高温热解、低温热解、超临界/亚临界水解、醇解、胺解、生物酶分解)、物理回收和能量回收等进行了比较。分析了不饱和聚酯回收的主要问题和今后发展方向。 相似文献