以甲氧基封端的MQ硅树脂为自增强交联剂的室温硫化硅橡胶的合成与表征

Synthesis and Characterization of Room Temperature Vulcanized Silicone Rubber Using Methoxyl-Capped MQ Silicone Resin as Self-Reinforced Cross-Linker.

作者信息

Ji Jianye, Ge Xin, Pang Xiaoyan, Liu Ruoling, Wen Shuyi, Sun Jiaqi, Liang Weijie, Ge Jianfang, Chen Xunjun

机构信息

Guangdong Engineering Research Center of Silicone Electronic Fine Chemicals, College of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China.

School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China.

出版信息

Polymers (Basel). 2019 Jul 3;11(7):1142. doi: 10.3390/polym11071142.

DOI:10.3390/polym11071142

PMID:31277337

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6680893/

Abstract

Methoxyl-capped MQ silicone resin (MMQ) was first synthesized by the hydrosilylation of vinyl-containing MQ silicone resin and trimethoxysilane and then used in condensed room-temperature vulcanized (RTV) silicone rubber as a self-reinforced cross-linker. Results show that modified silicone rubber exhibits good light transmission. Compared with unmodified silicone rubber, the hardness, tensile strength and elongation of MMQ at the break are increased by 26.4 A, 2.68 MPa and 65.1%, respectively. In addition, the characteristic temperature of 10% mass loss is delayed from 353.5 °C to 477.1 °C, the temperature at maximum degradation rate is also delayed from 408.9 °C to 528.4 °C and the residual mass left at 800 °C is increased from 1.2% to 27.7%. These improved properties are assigned to the synergistic effect of the rigid structure of MMQ, the formation of a dense cross-linking structure in polymers and the uniform distribution of MMQ cross-linking agent in RTV silicone rubber.

摘要

甲氧基封端的MQ硅树脂（MMQ）首先通过含乙烯基的MQ硅树脂与三甲氧基硅烷的硅氢加成反应合成，然后用作自增强交联剂用于缩合型室温硫化（RTV）硅橡胶。结果表明，改性硅橡胶具有良好的透光性。与未改性硅橡胶相比，MMQ的硬度、拉伸强度和断裂伸长率分别提高了26.4 A、2.68 MPa和65.1%。此外，10%质量损失的特征温度从353.5℃推迟到477.1℃，最大降解速率温度也从408.9℃推迟到528.4℃，800℃时的残留质量从1.2%增加到27.7%。这些性能的改善归因于MMQ刚性结构的协同作用、聚合物中致密交联结构的形成以及MMQ交联剂在RTV硅橡胶中的均匀分布。