端烷氧基聚甲基三氟丙基硅氧烷的合成表征和室温交联特性  

Synthesis,Characterization and Room Temperature Crosslinking Characteristics of Alkoxy Terminated Poly(methyltrifluoropropyl)siloxanes

作　　者：刘润竹 张猛[1] 张天福 张孝阿[1] 王成忠[1] 江盛玲[1] 史翎[1] 李伟[2] Runzhu Liu;Meng Zhang;Tianfu Zhang;Xiao’a Zhang;Chengzhong Wang;Shengling Jiang;Ling Shi;Wei Li(Key Laboratory of Carbon Fiber and Functional Polymers of Ministry of Education,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Key Laboratory of Aerospace Chemical Power Technology,Hubei Institute of Aerospace Chemistry Technology,Xiangyang 441003,China)

机构地区：[1]北京化工大学碳纤维及功能高分子教育部重点实验室材料科学与工程学院,北京100029 [2]航天化学动力技术重点实验室湖北航天化学技术研究所,湖北襄阳441003

出　　处：《高分子材料科学与工程》2022年第4期1-9,19,共10页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(21975066);航天化学动力技术重点实验室开放基金(STACPL 120201B07)。

摘　　要：以α,ω-端羟基聚甲基三氟丙基硅氧烷为初始聚合物,通过与含氢硅氧烷脱氢缩合合成了相对分子质量、官能度和官能团各异的6种氟硅聚合物(M1~M4,M5和E1)。通过傅里叶变换红外光谱和核磁共振波谱对封端聚合物进行了表征,并通过流变学手段研究了聚合物在室温交联硫化过程中黏度(η)和模量(G′和G″)的变化,为交联反应速率提供依据。结果表明,封端聚合物在不外加交联剂时亦能发生自交联。当采用同一交联剂M1时,与初始聚合物H4相比,封端后的聚合物M4具有较快的黏度上升趋势和交联反应速率,溶胶-凝胶转变点的时间由2 h以上缩短为22.5 min,原因在于烷氧基封端降低了三氟丙基侧基对活性端基的屏蔽作用,因而反应性大为提高。以M2~M4为基础聚合物制得的氟硅密封胶,具有较好的交联密度、力学性能和耐高低温性能。Six fluorosilicon polymers with different molecular weight,functionalities and functional groups(M1~M4,M5 and E1)were synthesized.The capped polymers were characterized by Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy,and the viscosity(η)and moduli(G′and G″of the polymers during room temperature cross-linking and vulcanization were studied by rheological measurements)changes to provide a basis for the cross-linking reaction rate.The results show that the end-capped polymer can also self-crosslink without adding cross-linking agent.When the same cross-linking agent(M1)is used,the same as the initial polymer(H4),the end-capped polymer(M4)has a faster viscosity increase trend and cross-linking reaction rate,and the sol-gel transition point time is shortened from more than 2 h to 22.5 min,because the alkoxy end-capping reduces the shielding effect of the trifluoropropyl side groups on the active end groups,so the reactivity is greatly improved.The fluorosilicone sealant made of M2~M4 as base polymer has the better crosslinking density,mechanical properties and resistance to high and low temperature performance.

关 键 词：氟硅聚合物 烷氧基封端 室温脱醇硫化 

分 类 号：TQ436.6[化学工程]