双环戊二烯与乙烯-醋酸乙烯酯共聚物原位聚合共混  

Polymerization-Blending of Dicyclopentadiene with Ethylene-Vinyl Acetate Copolymer in Situ

作　　者：郭萌[1] 李旭阳[1] 赫玉欣[1] 高喜平[1] 张玉清[1] 

机构地区：[1]河南科技大学高分子科学与纳米技术重点实验室,河南洛阳471003

出　　处：《高分子材料科学与工程》2015年第5期115-120,共6页Polymer Materials Science & Engineering

基　　金：河南省杰出人才创新基金项目(074200510019)

摘　　要：采用拟反应注射成型(RIM)工艺,在经典开环易位催化体系下,将溶有乙烯-醋酸乙烯酯共聚物(EVA)的双环戊二烯(DCPD)进行原位聚合共混,制备了PDCPD/EVA复合材料,从而对PDCPD进行增韧。考察了EVA的相对分子质量及添加量对DCPD聚合反应和复合材料力学性能的影响,运用扫描电镜、差示扫描量热分析、热重分析等对聚合物进行了表征,研究了复合材料的微观形貌、力学性能以及热性能。结果表明,EVA与PDCPD能形成半互穿网络结构,EVA的引入显著提高了材料的冲击性能,其中,EVA用量为5%时冲击性达到最高,可提高85%,拉伸和弯曲强度略有下降,同时材料的热稳定性也有所提高,热分解温度提高了4.2℃,PDCPD/EVA的冲断面呈现韧性断裂。By means of reaction injection molding( RIM),polydicyclopentadiene / ethylene-vinyl acetate copolymer( PDCPD/EVA) composite was prepared for toughening PDCPD by in-situ polymerization-blending of dicyclopentadiene( DCPD) and EVA,using the classical catalytic system of ring-opening metathesis polymerization. The influence of EVA molecular weight and content on polymerization activity and mechanical properties of polymer composites were investigated. The obtained polymer composites were characterized through SEM,DSC,TG and so on,and studied the microstructure,mechanical properties and thermal properties. The results reveal that EVA and PDCPD form semi-interpenetrating polymer networks structure. The addition of EVA significantly improves the impact resistance of material,especially when all EVA content rises to 5%,the impact strength reaches the maximum which increases by 85% comparing with PDCPD,tensile strength and flexural strength decrease slightly; and the composite has good thermal stability,the thermal decomposition tempreture increases 4. 2 ℃. The impact fracture shows a ductile fracture.

关 键 词：聚双环戊二烯 共混 互穿网络 乙烯-醋酸乙烯酯共聚物 增韧 

分 类 号：TQ323[化学工程—合成树脂塑料工业]