多壁碳纳米管表面可控接枝柔性嵌段-含环氧基团嵌段共聚物及其对环氧树脂的增强增韧研究

项目名称： 多壁碳纳米管表面可控接枝柔性嵌段-含环氧基团嵌段共聚物及其对环氧树脂的增强增韧研究

项目编号： No.51503071

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 叶昀昇

作者单位： 华中科技大学

项目金额： 21万元

中文摘要： 与碳纳米管复合是同时增强增韧环氧树脂的有效方法，目前还缺乏构建合适的界面结构，导致碳纳米管的作用难以充分发挥。本项目结合点击化学和可逆加成-断裂链转移聚合法，制备接枝密度、嵌段长度可控的柔性嵌段(聚丙烯酸丁酯)-b-含环氧基团嵌段(聚甲基丙烯酸环氧丙酯)接枝多壁碳纳米管(MWNT@PBA-b-PGMA)，然后与环氧树脂复合，研究接枝密度、PBA及PGMA嵌段长度对复合材料的分散性、界面粘接强度和力学性能的影响规律，通过材料损伤后微观结构揭示其增强增韧机理，优化MWNT@PBA-b-PGMA，制备高性能的环氧树脂复合材料。项目创新点是建立接枝密度、各嵌段长度可控的嵌段共聚物接枝MWNT的方法，在环氧树脂/MWNT复合材料中构建界面粘接强度适中、可形变的界面，利用碳纳米管桥联裂纹增韧机理，充分发挥碳纳米管卓越的增强增韧作用，从而制备高性能环氧树脂复合材料，丰富高性能高分子复合材料结构设计理论。

中文关键词： 环氧树脂；碳纳米管；可控聚合；界面调控；增强增韧

英文摘要： Interface design is a crucial factor for developing superior mechanical performance of epoxy/carbon nanotube (CNT) composites. However, the interfacial construction between CNT and epoxy need to be optimized for utilizing CNT nanostructure more fully. Herein, an alkyne-bering CNTs core was used to prepare poly(butyl acrylate-b-glycidyl methacrylate) (PBA-b-PGMA) block copolymer functionalized CNT using grafting to and grafting from strategies in combination with reversible addition fragmentation chain transfer and click chemistry. The PBA-b-PGMA-functionalized multi-walled CNT (MWNT@PBA-b-PGMA) was introduced into epoxy matrix for the preparation of epoxy/MWNT@PBA-b-PGMA composites. The modulating the stoichiometric ratio of functionalized-block copolymer around CNTs to construct a hiearachical structure that can further modulate CNTs/EP interfaces to optimize the strength and toughness of composites simultaneously. The highlights of this article are constructing flexible and tunable epoxy/CNT interfaces by adjusting grafting strategies, grafting densities, grafted chain length, stoichiometric ratio of functionalized-block copolymer that can promote load transfer but also improve fiber bridging for preparation of thermal stable, high strength and toughness epoxy-based composites.

英文关键词： epoxy;carbon nanotube;controllable polymerization;interface optimization;reinforcing and toughening