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综述了环氧树脂(EP)增韧改性的主要方法,分别阐述了通过热致性液晶聚合物、纳米粒子聚合物、超支化聚合物、核壳结构聚合物、互穿网络聚合物、柔性链聚合物等方式增韧EP的原理,并分析现阶段这些技术所面临的问题,最后对其将来的发展趋势进行了展望。 相似文献
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《中国胶粘剂》2017,(6)
EP(环氧树脂)/酸酐体系固化后形成高度交联的3维网状结构,导致其性能较脆;在不影响大尺寸制件液体成型工艺的前提下,综合考虑成本和增韧效果,初步选定可与EP基体形成"海岛结构"的奇士增韧剂对上述固化体系进行改性。研究结果表明:当w(奇士增韧剂)=5%(相对于EP质量而言)时,EP/酸酐固化体系的增韧效果相对最好;此时EP/酸酐浇铸体的拉伸强度为85.6 MPa、弯曲强度为135.8 MPa、冲击强度为30.6 k J/m~2、断裂伸长率为5%且热变形温度(HDT)仅降低了6℃,说明适量的奇士增韧剂既可弥补传统液体橡胶增韧EP的不足,也可改善浇铸体的断裂韧性,同时不影响浇铸体的热稳定性。 相似文献
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综述了近年来增韧改性聚甲醛(POM)的主要方法和研究进展,从弹性体增韧改性、刚性粒子增韧改性、合金化增韧改性、复合增韧剂增韧改性四个方面重点阐述了近年来国内POM增韧改性的最新研究成果,其中,弹性体增韧改性POM是传统的增韧方法,而且工艺上简单易行;刚性粒子增韧改性POM不但可以提高材料的韧性,而且还可以改善材料的强度、刚性和耐热性等,并降低成本,备受关注;合金化增韧改性POM在保持POM本身性能的同时,还改善了合金的耐磨性、韧性等其它性能;复合增韧剂改性POM对POM的增韧作用更加明显。最后对今后增韧改性POM的研究方向提出了建议。 相似文献
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分别采用邻苯二甲酸二丁酯(DBP)和苯乙烯-丁二烯-苯乙烯(SBS)来增韧环氧树脂玻璃钢(EPFRP),探讨增韧剂对EP FRP的拉伸性能、冲击性能以及硬度的影响。结果表明:DBP和SBS的质量分数为7%左右时,经两种增韧剂改性的EP FRP的性能相当;而当质量分数大于7%时,DBP的增韧效果随用量的增大进一步增强,而SBS的增韧效果则呈减弱趋势。从断口的微观形貌来看,是由于DBP和SBS分散状况不同,导致了两者增韧机理和增韧效果的差异。 相似文献
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聚合物基复合材料的增强增韧 总被引:1,自引:0,他引:1
介绍了聚合物基复合材料增强增韧的改性方法和机理,包括有机小分子、弹性体、刚性粒子、纤维以及碳纳米管增强增韧聚合物。并介绍了一些具有代表性的聚合物/增强增韧剂体系。并对聚合物基复合材料增强增韧的发展前景进行了展望。 相似文献
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废玻璃钢粉(WFRPP)经硅烷偶联剂KH550表面处理后,与环氧树脂(EP)共混并热压固化,制备了WFRPP/EP复合材料。研究了WFRPP与EP配比、偶联剂KH550的用量、增韧剂端环氧基液体丁腈橡胶(ET-BN)的用量对复合材料力学性能的影响,并通过电子扫描显微镜观察了复合材料内部的微观结构。结果表明:当WFRPP与EP配比为50∶70、偶联剂质量分数为5%(基于废玻璃钢粉质量)、增韧剂质量分数为12%(基于环氧树脂质量)时,所制备的复合材料综合性能最佳。废玻璃钢粉经适量偶联剂表面处理后,有利于废玻璃钢粉在体系中的均匀分散,并可以使WFRPP/EP复合材料获得较好的两相相容性。此外,ETBN对复合材料具有一定的增韧效果。 相似文献
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采用种子乳液聚合方法制备了聚(丙烯酸正丁酯/甲基丙烯酸甲酯-co-甲基丙烯酸缩水甘油酯)核壳增韧剂(PBMG),并用湿法球磨与超声辅助相结合的方法对六方氮化硼(h-BN)进行改性,制备的改性氮化硼(MBN)可提高环氧树脂(EP)的热导率。最后采用机械共混方法制备了环氧树脂/增韧剂/改性氮化硼(EP/PBMG/MBN)复合材料。通过透射电子显微镜(TEM)、扫描电子显微镜(SEM)、X射线衍射(XRD)、动态激光光散射(DLS)、热导率和力学性能等测试对核壳增韧剂的粒子形成、改性氮化硼和复合材料进行了表征。结果发现:最终制备的聚丙烯酸酯乳胶粒子呈现明显的核壳结构,且粒度分布很窄。当聚丙烯酸酯增韧剂添加量为5%、改性氮化硼为8.99%时,环氧树脂/增韧剂/改性氮化硼复合材料的冲击强度和热导率比纯环氧树脂(EP)的分别提高了133%和171%。随着未来的基板材料要求有效的热耗散,这种复合材料有望用于微电子工业上。 相似文献
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Weiming Chen Zhiqiang Tao Lin Fan Shiyong Yang Wenge Jiang Junfeng Wang Yanli Xiong 《Polymer Composites》2010,31(4):666-673
Novel‐fluorinated poly(etherimide)s (FPEIs) with controlled molecular weights were synthesized and characterized, which were used to toughen epoxy resins (EP/FPEI) and carbon fiber‐reinforced epoxy composites (CF/EP/FPEI). Experimental results indicated that the FPEIs possessed outstanding solubility, thermal, and mechanical properties. The thermally cured EP/FPEI resin showed obviously improved toughness with impact strength of 21.1 kJ/m2 and elongation at break of 4.6%, respectively. The EP/FPEI resin also showed outstanding mechanical strength with tensile strength of 91.5 MPa and flexural strength of 141.5 MPa, respectively. The mechanical moduli and thermal property of epoxy resins were not affected by blending with FPEIs. Furthermore, CF/EP/FPEI composite exhibited significantly improved toughness with Mode I interlaminar fracture toughness (GIC) of 899.4 J/m2 and Mode II interlaminar fracture toughness (GIIC) of 1017.8 J/m2, respectively. Flexural properties and interlaminar shear strength of the composite were slightly increased after toughening. POLYM. COMPOS., 2010. © 2009 Society of Plastics Engineers 相似文献
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以高密度聚乙烯(HDPE)为基体树脂,(乙烯/丙烯)共聚物和(苯乙烯/丁二烯)共聚物为增韧剂研制出5种弹性体含量不同的聚乙烯增韧母料(E-TMB),将E-TMB与HDPE热机械共混制得弹性体总含量均为6.3%的5种HDPE/E-TMB共混物,研究了E-TMB中弹性体含量对共混物力学性能和热性能的影响。结果表明,当E-TMB中弹性体含量为44%时,共混物的综合力学性能最好,悬臂梁缺口冲击强度是HDPE的5.65倍,拉伸屈服强度和弯曲弹性模量保留率分别为90.8%和73.7%;共混物的熔点和热分解温度随E-TMB中弹性体含量的增加而升高,结晶温度随E-TMB中弹性体含量的增加而降低。 相似文献
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石墨烯是一种新型碳纳米材料,具有独特的力学、热学、光学、电学等性质,将石墨烯与聚合物复合是近年来的研究热点。聚苯乙烯(PS)的可加工性较好、成型收缩率较小、价格低廉、应用广泛,但其硬而脆,耐热性、力学性能和导电性较差,将石墨烯与PS复合能有效改善其综合性能。介绍了石墨烯/聚苯乙烯复合材料的制备方法,分析比较了熔融共混、溶液共混、原位乳液聚合、静电自组装以及微球覆盖还原等5种方法的优缺点;详细阐述了石墨烯或其衍生物改性聚苯乙烯复合材料热性能、电性能及力学性能方面的最新研究进展;最后,分析了复合材料在阻燃、金属防腐、污染物处理、光子晶体等领域的应用现状。 相似文献
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The ternary blends of polyamide 6/maleated ethylene‐propylene‐diene rubber/epoxy (PA6/EPDM‐g‐MA/EP) were prepared by a twin‐screw extruder with four different blending sequences. With the variation of blending sequence, the ternary blends presented distinct morphology and mechanical properties because of different interactions induced by various reactive orders. The addition of epoxy could increase the viscosity of the PA6 matrix, but a considerably larger size of the dispersed rubber phase was observed while first preblending PA6 with epoxy followed by blending a premix of PA6/EP with EDPM‐g‐MA, which was attested by rheological behaviors and SEM observations. It was probably ascribed to the fact that the great increase of the interfacial tension between the matrix and rubber phase aroused a great coalescence of rubber particles. The presence of epoxy in the rubber phase reduced the rubber's ability to cavitate so that the toughening efficiency of the EPDM‐g‐MA was decreased. The results of mechanical testing revealed that the optimum blending sequence to achieve balanced mechanical properties is blending PA6, EPDM‐g‐MA, and epoxy simultaneously in which the detrimental reactions might be effectively suppressed. In addition, thermal properties were investigated by TG and DSC, and the results showed that there was no distinct difference. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
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Xiyun S. Fan 《乙烯基与添加剂工艺杂志》2007,13(2):65-70
An ethylene‐(methyl acrylate) (EMA) copolymer produced from a tubular reactor was found to be effective in toughening polypropylene, even at low concentrations. The addition of a small amount of TiO2 pigment enhanced the EMA toughening effect. Microscopy and thermal analysis helped to reveal the possible EMA toughening mechanisms. The effects of two processing methods, dry blending and melt blending, on the mechanical properties of the formulation were also studied. J. VINYL ADDIT. TECHNOL., 13:65–70, 2007. © 2007 Society of Plastics Engineers. 相似文献