含苯并双咪唑高阻燃共聚聚酰亚胺薄膜的制备及其性能研究  

Synthesis and properties of high-flame retardance co-polyimide films containing bis-benzimidazole units

作　　者：李猛猛 董杰[1] 甘锋 郑森森 赵昕[1] 张清华[1] LI Mengmeng;DONG Jie;GAN Feng;ZHENG Sensen;ZHAO Xin;ZHANG Qinghua(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620)

机构地区：[1]东华大学材料科学与工程学院纤维改性国家重点实验

出　　处：《合成纤维工业》2019年第3期24-29,共6页China Synthetic Fiber Industry

基　　金：国家重点研发计划项目(2017YFB0308304)

摘　　要：以二胺单体2,2′-对苯基双-(5-氨基苯并咪唑)(PBABI)、1,4-二氨基苯二胺(p-PDA)与二酐单体3,3′,4,4′-联苯四甲酸二酐(BPDA)进行共聚,制备高相对分子质量的聚酰亚胺(PI)前驱体聚酰胺酸(PAA),再通过热酰亚胺化的方式得到含苯并双咪唑重复单元的高阻燃共聚PI薄膜;研究了PI薄膜的聚集态结构、化学结构、热稳定性、阻燃性能和力学性能。结果表明:随着苯并双咪唑单体的增多,PI薄膜逐渐从有序堆积向无定型结构演变;苯并双咪唑结构促进了PI薄膜体系中形成分子间氢键作用;苯并咪唑的引入使PI薄膜的最大热分解温度提高5℃、玻璃化转变温度提升90℃、拉伸强度提高126MPa,同时含苯并双咪唑的PI薄膜表现出优异的阻燃性能,极限氧指数提高到54%。Polyamide acid(PAA),a co-polyimide(PI)precursor with high relative molecular mass,was synthesized by copolymizing a diamme monomer of 2,2′-p-phenylenebis(5-aminobenzimidazole)(PBABI),1,4-diaminophenylenediamine(p-PDA)and a dinhydride monomer of 3,3′,4,4′-biphenyltetracarboxylic dianhydride(BPDA)and was produced into high-flame retardance PI films containing bis-benzimidazole moieties by thermal imidization.The aggregation structure,chemical structure,thermal stability,flame retardancy and mechanical properties of PI films were studied.The results showed that PI films gradually evolved from ordered accumulation to amorphous structure with the increase of bis-benzimidazole monomer;the bis-benzimidazole structure promoted the formation of intermolecular hydrogen bonds in PI film system;the introduction of bis-benzimidazole increased the maximum thermal decomposition temperature of PI films by 5℃,glass transition temperature by 90℃and tensile strength by 126 MPa;and PI films containing bis-benzimidazole exhibited excellent flame retardancy and the limiting oxygen index up to 54%.

关 键 词：聚酰亚胺 聚酰胺酸 苯并双咪唑 共聚 阻燃性能 热稳定性 力学性能 

分 类 号：TQ342.73[化学工程—化纤工业]