侧环氧基端醛基液体橡胶对环氧树脂的改性研究  

The modification of epoxy resin by aldehyde-terminated liquid rubberwith side epoxy groups

作　　者：王银龙 胡激江 朱丽倩[1,2,3] 姚臻 卜志扬 李伯耿[1,2,3] Yinlong Wang;Jijiang Hu;Liqian Zhu;Zhen Yao;Zhiyang Bu;Bo-Geng Li(Institute of Zhejiang University-Quzhou,Quzhou 324000,China;Zhejiang High-end Chemical Technology Innovation Centre,Quzhou 324000,China;State Key Laboratory of Chemical Engineering,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学衢州研究院,衢州324000 [2]浙江省高端化学品技术创新中心,衢州324000 [3]浙江大学化学工程与生物工程学院,化学工程联合国家重点实验室,杭州310058

出　　处：《中国科学：化学》2024年第11期2300-2310,共11页SCIENTIA SINICA Chimica

基　　金：浙江省“尖兵领雁+X”研发攻关计划项目(编号:2024SJCZX0018);浙江省高端化学品技术创新中心项目(编号:ACTIC-2022-006)资助。

摘　　要：环氧树脂是主要的热固性树脂之一,传统的增韧方法虽能改善其韧性,但刚性与强度等其他性能往往有所下降.因此,在提高环氧树脂韧性的同时,保持甚至提高其刚性和强度具有重要意义.本文通过环氧化-裂解法分别制备了含侧环氧基的端醛基液体丁苯橡胶和聚丁二烯橡胶,并利用其链结构中的活性基团,通过共固化反应将柔性链引入到环氧树脂交联网络中,形成硬软链相互交联的特殊拓扑结构,并适度增大了交联密度.研究发现,两种液体橡胶均可有效改善环氧树脂的韧性,并明显提高刚性和强度.此外,因丁苯橡胶中的苯乙烯单元可使液体橡胶更好地分散在环氧树脂基体中,侧环氧基端醛基液体丁苯橡胶对环氧树脂具更好的增韧增强效果;当液体丁苯橡胶的环氧化率为5.8%、添加量为1 wt%时,改性树脂的综合性能最佳.Epoxy resin is one of the main thermosetting resins.Although traditional toughening methods can improve the toughness,other properties,such as rigidity and strength,tend to decrease.Therefore,it is of great significance to maintain or even improve the rigidity and strength while increasing the toughness of epoxy resins.In this paper,the aldehyde-terminated liquid styrene-butadiene rubber and polybutadiene rubber with side epoxy groups(EATSBR and EATPB)were prepared by the epoxidation-cracking method.Then,the flexible chains were introduced into the epoxy resin cross-linking network through co-curing by utilizing their reactive groups to form a special topology where the hard and soft chains were cross-linked with each other,and the cross-linking density was moderately enlarged.It has been found that both of the two liquid rubbers can effectively improve the toughness of epoxy resin and significantly enhance its rigidity and strength.Moreover,EATSBR has a better toughening and strengthening effect on epoxy resin since existence of styrene units in its macromolecular chain can better disperse the rubber in the epoxy resin matrix.The comprehensive modification effect was the best when the epoxidation ratio of EATSBR is 5.8%and its addition amount is 1 wt%.

关 键 词：环氧树脂 侧环氧基液体橡胶 共固化 增韧改性 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]