两亲性嵌段共聚物聚己内酯-聚二甲基硅氧烷-聚己内酯增韧氰酸树脂性能研究  

THE PROPERTIES OF AMPHIPHILIC BLOCK COPOLYMER POLYCAPROLACTONE-POLYDIMETHYLSILOXANE-POLYCAPROLACTONE TOUGHENED CYANATE RESIN

作　　者：刘琦 周权[1] 宋宁[1] 倪礼忠[1] 冯伟祖 张颂 和胡明峰 LIU Qi;ZHOU Quan;SONG Ning;NI Li-zhong(Key Laboratory for Specially Functional Polymers and Related Technology of Ministry ofEducational of East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学特种功能高分子材料及相关技术教育部重点实验室,上海200237 [2]无锡新宏泰电器科技股份有限公司,无锡214174

出　　处：《玻璃钢／复合材料》2018年第11期99-103,63,共6页Fiber Reinforced Plastics/Composites

摘　　要：采用开环聚合合成聚己内酯-b-聚二甲基硅氧烷-b-聚己内酯(PCL-b-PDMS-b-PCL)两亲性三嵌段聚合物混合进氰酸酯树脂预聚体中,得到了具有纳米复合结构的氰酸酯树脂/嵌段改性混合物。氰酸酯树脂/嵌段体系的SAXS与TEM结果表明,CE/PCL-b-PDMS-b-PCL体系自组装形成50 nm～60 nm的纳米复合结构。随着嵌段含量增加,多相形态由颗粒改变至蠕虫状结构,粒子间距增大。非等温DSC固化与KIC数据结果表示,氰酸酯树脂/嵌段体系固化放热峰的温度逐渐降低,反应活性提高,并且其断裂韧性有所提高。By the ring-opening polymerization of caprolactone,PCL-b-PDMS-b-PCL triblock amphiphilic polymer was obtained and added into the cyanate ester thermosetting resin,producing a mixture of self-assembled nanostructures.In the ester resin prepolymer,a cyanate resin/block modification mixture having a nanocomposite structure is obtained.The results of cyanate resin/block system SAXS and TEM confirm that the 50 nm^60 nm nanostructures were achieved by CE/PCL-b-PDMS-b-PCL system.The system also has a diverse morphology from particles to worm-like structures as the block polymer content increases.Meanwhile,the average distance between neighboring microdomains increases.The mechanism of the the CE/PCL-PDMS-PCL is self-assembling.By non-isothermal DSC curing and critical stress intensity factor(K IC)value,the block-modified resin is 25℃~50℃ahead of the exothermic peak of the unmodified CE resin,indicating that the reactivity of blends system is improved.The K IC of the 20 wt%block content of CE/PCL-b-PDMS-b-PCL was 0.65,which was 97%higher than that of the unmodified CE system,demonstrating that the fracture toughness of the block-modified resin is improved.

关 键 词：嵌段共聚物 氰酸树脂 自组装 

分 类 号：TB332[一般工业技术—材料科学与工程]