聚亚苯基硅氧烷交联网络的热性能.pdf

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CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2008年第27卷第8期
聚亚苯基硅氧烷交联网络的热性能
陈循军,崔英德2,尹国强',胡文斌
(仲恺农业工程学院绿色化工研究所,广东广州510225:2西北T业大学材料学院,陕西西安710072)
摘要:用Si-H/Si-OR縮聚的方法制备了含可交联乙烯基的聚亚苯基硅氧烷-二甲基硅氧烷共聚物
( PTMPS-DMS)、用硅氢加成、BPO热交联两种方法进行交联得到交联网络,并用热重分析(TG)、300℃恒温
热分析和DSC等方法对其热性能进行了研究。结果表明,交联方法对 PTMIPS-DMS交联网络的热稳定性影响很
大,BPO热交联网络的热稳定性远远高于硅氲加成交联网络,两种交联网络在空气中的5%热失重温度分别是480
℃和368℃,2则没有显著差异,分別是-55℃和-49℃。H2PtCk能显著降低 PTMPS-DMS及其交联网络在空
气中的热稳定性
关键词:耐高温弹性体;硅橡胶;聚亚苯基硅氧烷;热性质
中图分类号:TQ050.4文献标识码:A文章编号:1000-6613(2008)08-1246-05
Preparation and thermal properties of cross linked
poly(silphenylene-dimethyl siloxane )network
CHEN Xunjun UI Yingde,, Y/N Guoqiang, HU Wenbin
Institute of Green Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225
Guangdong, China; School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an
710072, Shaanxi, China)
Abstract: Poly(Silphenylene-dimethyl siloxane)s(ptmps-dms)containing crosslinkable vinyl groups
were synthesized through the SI-H/SI-OR polycondensation process. The crosslinked PTMPS-DMS
networks were prepared by hydrosilation and the BPO thermal crosslink process respectively. TG, DSC
and isothermal gravimetric analysis at 300C showed that the crosslink process had great impact on the
thermal properties of the crosslinked networks. The BPO thermal crosslinked network, which began to
degrade at 480 C in air, possessed much higher thermo-oxidation stability than that crosslinked by the
hydrosilation process, which began to degrade at 368 C in air. The Tes of these two networks had no
significant difference, which were -55C and -49C, respectively. It showed that the catalyst
H> Ptclo greatly decreased the thermo-oxidation stability of the PTMPS-DMS networks
Key words: high temperature elastomer; silicone rubber; poly(silphenylene siloxane)s; thermal property
在聚硅氧烷主链中引入亚芳基链节可以大大提合物在过渡金属催化剂催化下通过脱氢耦合制备聚
高其耐高温、耐辐照性能,同时也能提高其机槭强亚苯基硅氧烷具有选择性高、副产物氢气易分离的
度。交联聚苯基硅氧烷是一种耐高低温、耐辐照特点,是一-种十分有效的制备聚亚苯基佳氧烷新方
的高性能弹性体材料,可以应用于微电子元器件的法]。但这种方法要用到易自聚的硅醇单体,且
绝缘、航天器燃料罐的密封、炊具的表面涂层、汽不能制备可交联的乙烯基取代的聚亚苯基硅氧烷。
车刹车系统、核反应装置等高技术领域1。亚苯Si-H/B(C6Fs)3是一种十分有效的还原试剂,在有
基聚硅氧烷通常是由1,4-双(羟基二甲基硅基)苯
( BASB)与二氯烷、二氨基硅烷、二脉硅烷等
收稿日期:2007-11-19:修改稿日期:2008-02-22
缩聚得到+-]。Si-H与Si-OH或其它含活泼氢化
第一作者简介:陈循军(1976…),男,博士,研究方向为有机精
细化学品及有机硅高分子材料。E-mailcxiqiao@163.coma