苯并噁嗪_聚醚砜共混体系的相结构及性能研究.docVIP

 苯并噁嗪/聚醚砜共混体系的相结构及性能 研究# 梁晓敏，赵培，顾宜** 5 10 15 20 25 30 （高分子材料工程国家重点实验室，四川大学高分子科学与工程学院，成都 610065） 摘要：本文首次用 20wt%聚醚砜(PES)改性二苯甲烷二胺型苯并噁嗪(BOZ-M)。通过涂膜的 方法得到外观均匀的韧性薄膜，并借助于扫描电子显微镜(SEM)、傅里叶红外光谱(FTIR)及 动态机械分析仪(DMA)研究了固化物薄膜的微相结构、微相组成、耐热性能及力学性能。结 果表明，该共混体系在 BOZ-M 树脂固化过程中发生了明显相分离，形成以 PES 富集相为连 续相、聚苯并噁嗪(PBOZ-M)富集相为球形分散相的相反转结构的相形态，其中柔性的 PES 薄膜紧密包裹着 PBOZ-M 微球(1-3um)。共混薄膜的玻璃化转变温度(Tg)为 216 ，断裂伸 长率为 3.5%，具有优异耐热性及力学性能。 关键词：聚醚砜；苯并噁嗪；相形态；耐热性；力学性能 中图分类号：TQ323.1 Morphology and Properties of Benzoxazine/Poly(ether sulfone) System LIANG Xiaomin, ZHAO Pei, GU Yi (State Key Laboratory of Polymer Materials Engineering , College of Polymer Sciences and Engineering ,Sichuan University, Chengdu 610065) Abstract: 4,4’-diaminodiphenyl methane based benzoxazine(BOZ-M) resin was modified with 20wt% content of poly(ether sulfone)(PES). Uniform and flexible film after curing could be obtained through casting method. The morphology of blending film, constitutes of each phase, thermal and mechanical property were studied by scanning electron microscope (SEM), flourier transform infrared spectrometer (FTIR) and dynamic mechanical thermal analysis (DMA). The results showed that this blending film exhibited phase inversion structure, which included PES-rich phase as the continuous phase and polybenzoxazine(PBOZ-M)-rich phase as the spherical disperse phase. PBOZ-M microspheres(1-3um) were packed by flexible PES films. The glass transition temperature(Tg) for this blending film was 216 ℃, the strain at break was 3.5%. This blending film had outstanding thermal stability and improved mechanical property. Key words: property poly(ether sulfone); benzoxazine; morphology; thermal stability; mechanical 35 40  0 引言 苯并噁嗪(BOZ)是一类新型的热固性树脂，因其灵活的分子设计性，固化过程中无小分 子放出，固化物近似零收缩，且固化物具有优异的热稳定性和机械性能，而被广泛应用于各 个领域[1-2]。但是 BOZ 树脂仍存在热固性树脂固有的缺陷，如固化物质脆、韧性差、冲击强 度低等，因此 BOZ 树脂的增韧改性成为近年来研究的热点和难点。 液体橡胶改性热固性树脂(TS)[3]在提高体系韧性的同时总是伴随体系耐热性的降低。而 热塑性工程塑料具有较好的耐热性和力学性能，用于改性 TS 树脂时，可以有效提高 TS 树 脂的韧性，同时保持 TS 树脂自身较高的强度、模量和玻璃化转变温度(Tg)，是 TS 树脂