文章摘要
POSS嵌段共聚物改性环氧树脂
Epoxy Composites Modified with POSS-Containing Block Copolymer
  
DOI:10.16865/j.cnki.1000-7555.2018.04.003
中文关键词: 环氧树脂  嵌段共聚物  笼形倍半硅氧烷  改性
英文关键词: epoxy resin  block copolymer  polyhedral oligomeric silsesquioxane  modification
基金项目:国家自然科学基金资助项目(51573150,51673161);福建省科技重大研发平台项目(2014H2006);福建省科技重大项目(2013HZ0005-1);福建省自然科学计划资助项目(2018J01079)
作者单位
吴顺伟, 李远源, 陈国荣, 曾碧榕, 李 敏, 许一婷, 戴李宗 福建省防火阻燃材料重点实验室 厦门大学材料学院福建 厦门 361005 
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中文摘要:
      采用可逆加成-断裂转移聚合(RAFT)方法合成甲基丙烯酰氧丙基七异丁基笼形倍半硅氧烷(MAiBuPOSS)和9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物甲基丙烯酸乙酯(HEPO)的嵌段共聚物PMAiBuPOSS-b-PHEPO(BCP),用于改性双酚A型环氧树脂。利用扫描电镜表征环氧树脂复合材料的断面形貌,发现PMAiBuPOSS-b-PHEPO嵌段共聚物可在环氧树脂中发生自组装,形成了以POSS嵌段为核、含磷嵌段为壳的核壳结构自组装体。动态力学分析、热重分析、差示扫描量热分析、垂直燃烧测试(UL-94)及极限氧指数(LOI)研究表明,PMAiBuPOSS-b-PHEPO嵌段共聚物中PHEPO链段增强了聚合物与环氧树脂的相容性,PMAiBuPOSS链段显著提高了环氧树脂的热稳定性和阻燃性能。当PMAiBuPOSS-b-PHEPO质量分数为5%时,环氧树脂复合材料LOI值为33.0%,UL-94燃烧等级为V-0级,且其力学性能也得到显著提升。
英文摘要:
      A block copolymer named PMAiBuPOSS-b-PHEPO was synthesized via reversible addition-fragmentation transfer polymerization (RAFT) and blended by using methacrylolsobutyl polyhedral oligomeric silsesquioxane (MAiBuPOSS) and 9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide ethyl methacrylate(HEPO) as monomers. This polymer was adopted to modify bisphenol A-based epoxy resin. Scanning electron microscope (SEM) characterization of the fracture surface of the composites indicates that PMAiBuPOSS-b-PHEPO could self-assemble in the epoxy resin to form a structure with POSS enriched core and PHEPO enriched shell. The thermal, mechanical and flame-retardant properties of the composites were characterized by dynamic mechanical analysis (DMA), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), vertical combustion test (UL-94) and limiting oxygen index measurement (LOI). It is found that PHEPO could improve the compatibility between PMAiBuPOSS-b-PHEPO and epoxy resin, therefore evidently improving the thermal stability and flame-retardance of the composite materials. With a mass fraction 5% of PMAiBuPOSS-b-PHEPO, the as formed composite materials possess a LOI value of 33.0%, reach UL-94 V-0 rating, as well as exhibit an enhanced mechanical strength.
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