亚磷酸酯功能化聚硅氧烷扩链聚乳酸的阻燃性能研究  

Effect of Phosphite‑Functionalized Polysilsesquioxane on Flame Retardancy of Polylactic Acid

作　　者：梁娟 蒋泽文 公维光 孟鑫[1,2] LIANG Juan;JIANG Zewen;GONG Weiguang;MENG Xin(Shanghai Key Laboratory of Multiphase Materials Chemical Engineering,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;Research&Development Center for Sports Materials,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学化工学院产品工程系,上海市多相结构材料化学工程重点实验室,上海200237 [2]华东理工大学体育学院,上海200237

出　　处：《中国塑料》2020年第6期7-13,共7页China Plastics

基　　金：国家自然科学基金项目(21576086)。

摘　　要：将聚氨基环氧基硅氧烷(PSQ)以及亚磷酸酯功能化的聚氨基环氧基硅氧烷(PPSQ)与聚乳酸(PLA)通过熔融共混制备了扩链PLA。研究了亚磷酸酯基团的引入对PSQ在PLA中的扩链和阻燃性能的影响,探究PPSQ在PLA中的阻燃机理。结果表明,相比于PSQ,PPSQ可以明显提高PLA的分子量和复合黏度,具有更好的扩链作用;PPSQ的引入可以明显改善PLA的阻燃性能,使得PLA-PPSQ的极限氧指数提高至25.4%,比纯PLA提升了31.6%,且使得PLA的热释放速率峰值和总热释放量分别下降了18.1%和16.6%。分析可知,由于亚磷酸酯基团的引入,促使PLAPPSQ中的硅元素在燃烧过程中向炭层表面迁移形成更多富含碳化硅和氧化硅的致密炭层,起到隔热隔氧的作用,进而发挥优异的阻燃性能。The chain-extended PLA was prepared by blending PLA with poly(amino-epoxy)silsesquioxane(PSQ),and phosphate-functionalized poly(amino-epoxy)silsesquioxane(PPSQ).The effect of phosphite ester groups on the chain extension and flame retardancy of PSQ in PLA matrix was investigated,and the flame retardant mechanism of PPSQ was further studied in detail.The results showed that the PPSQ significantly improved the molecular weight and complex viscosity of PLA in comparison of PSQ,indicating that the PLA-PPSQ compound achieved a better chain-extension effect.The incorporation of PPSQ also enhanced the flame retardancy of PLA and led to a limiting oxygen index of 25.4 vol%for the chain-extended PLA,which increased by 31.6%compared to pure PLA.Furthermore,the heat release rate and total heat release of PLA-PPSQ compound also decrease by 18.1%and 16.6%,respectively.On the basis of the flame retardant mechanism,the introduction of phosphite ester groups into PSQ can promote the migration of silicon to the surface during the combustion of PLA-PPSQ compound and forms a dense carbon layer rich in silicon carbide and silicon oxide.Such a carbon layer can effectively inhibit the transfer of heat and oxygen and endows PLA with excellent flame retardancy accordingly.

关 键 词：聚乳酸 亚磷酸酯 聚硅氧烷 扩链 阻燃 机理 

分 类 号：TQ323.6[化学工程—合成树脂塑料工业]