【摘要】 通过原子转移自由基聚合反应合成了以丙烯酸正丁酯(nBA)、甲基丙烯酸甲酯(MMA)及甲基丙烯酸缩水甘油酯(GMA)为单体的嵌段共聚物,采用凝胶渗透色谱仪、核磁共振波谱仪和傅立叶红外光谱仪对嵌段共聚物的结构与组成进行了确定。然后用合成的嵌段共聚物对环氧树脂(EP)/4,4′-二氨基二苯甲烷体系进行增韧改性,采用动态热机械分析仪、冲击试验机和扫描电子显微镜对增韧效果进行了表征并对增韧机理做了初步分析。结果表明,嵌段共聚物的加入对体系的主转变温度和模量影响不大;在嵌段共聚物中MMA与nBA的物质的量之比为1∶1时,嵌段共聚物在EP固化时发生微相分离,缺口冲击强度明显提高。更多还原

【Abstract】 A series of copolymers of methylmethacrylate(MMA), glycidylmethacrylate(GMA) and n-butylacrylate(nBA) were prepared by copper-mediated atom transfer radical polymerization (ATRP). The properties of copolymer were characterized by 1HNMR, GPC and FTIR. The copolymers were added into epoxy resin(EP)/4,4′-diaminodipenyl methane (DDM) system as toughening modifier. The properties of EP/DDM/copolymer cured system and toughening mechanism were investigated by impact testing machine, DMA and SEM. Results showed that the glass transition temperature and the modulus of EP/DDM/copolymer cured system were approximate with EP/DDM cured system. When polymerization degree of PMMA/PnBA in block copolymer was 1∶1(mol/mol), micro-phase separation occured in the cure process of EP, and the best impact strength was obtained.更多还原