摘要
合成一种含P、Si协同阻燃的新型嵌段共聚物,将合成的阻燃嵌段共聚物分散于双酚A型环氧树脂E51中,以4,4′-二氨基二苯甲烷(DDM)为固化剂,制备了一系列不同P、Si含量的阻燃环氧树脂.采用扫描电镜(SEM)对改性环氧树脂断面进行观察,通过动态力学热分析(DMTA)、差示扫描量热法(DSC)、热失重分析(TGA)及氧指数(LOI)对改性环氧树脂进行性能测试.结果表明:合成的含P、Si新型嵌段共聚物在环氧树脂中能够自组装形成以多面体齐聚半硅氧烷(POSS)链段为核、含磷嵌段为壳的纳米核壳结构,阻燃元素P、Si以"捆绑式"均匀分散在环氧基体中,达到低P、Si含量下优良的协同阻燃效果.此外,添加阻燃嵌段共聚物还能够有效提高环氧树脂热稳定性.
A novel phosphorus-silicon synergistic flame retardant block copolymer,named as PMAiBuPOSS-b-PGMA-g-DOPO（PMGD）,was prepared.A series of flame retardant epoxy resins composed of different content of phosphorus and silicon were prepared by mixing PMGD with diglycidyl ether of bisphenol-A（E51）,and using 4,4′-diaminodiphenylmethane（DDM）as a curing agent.The morphology of fracture surfaces was studied using scanning electron microscope（SEM）,and the properties were evaluated using dynamic mechanical thermal analysis（DMTA）,differential scanning calorimetry（DSC）,thermogravimetric analysis（TGA）,and limiting oxygen index（LOI）.The results showed that PMGD could self-assemble into core-shell structure in E51 with PMAiBuPOSS segment as core,and phosphorus-containing block as shell.Despite of a very low P and Si content in the epoxy matrix,retardant elements P and Si were homogeneously dispersed in the epoxy matrix in a ＂ bundled＂ form,which led to an excellent synergistic flame retardant effect.In addition,the modified epoxy resins had much better thermal stability.
出处
《厦门大学学报（自然科学版）》
CAS
CSCD
北大核心
2015年第2期156-162,共7页
Journal of Xiamen University：Natural Science
基金
国家自然科学基金(U1205113,51273164)
厦门市科技计划项目(3502Z20130033,3502Z20133003)
关键词
POSS基含磷嵌段共聚物
无卤阻燃
环氧树脂
热稳定性
POSS-based phosphorus-containing block copolymer
halogen-free flame retardant
epoxy resin
thermal stability
