How the Crosslinking Agent Influences the Thermal Stability of RTV Phenyl Silicone Rubber

被引：32

作者：

He, Chen ^{[1
]}

Li, Boqian ^{[1
]}

Ren, Ying ^{[1
]}

Lu, Wu ^{[1
]}

Zeng, Yibing ^{[1
]}

He, Weidong ^{[2
,3
]}

Feng, Anchao ^{[4
]}

机构：

[1] Aerosp Res Inst Mat & Proc Technol, Beijing 100076, Peoples R China

[2] Univ Sci & Technol China, Chinese Acad Sci, Key Lab Soft Matter Chem, Hefei 230026, Anhui, Peoples R China

[3] Univ Sci & Technol China, Dept Polymer Sci & Engn, Hefei 230026, Anhui, Peoples R China

[4] Beijing Univ Chem Technol, Coll Mat Sci & Engn, Beijing 100029, Peoples R China

来源：

MATERIALS | 2019年 / 12卷 / 01期

关键词：

RTV phenyl silicone rubber; thermal stability; pyrolysis; cross-linking agent; residual hydroxyl; DEGRADATION; POLYSILOXANES; MECHANISM; LOOKING;

D O I：

10.3390/ma12010088

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this work, a thermal degradation mechanism of room temperature vulcanized (RTV) phenyl silicone rubber that was vulcanized by different crosslinking agents was discussed. Firstly, RTV phenyl silicone rubber samples were prepared by curing hydroxyl-terminated polymethyldiphenylsiloxane via three crosslinking agents, namely, tetraethoxysilane (TEOS), tetrapropoxysilane (TPOS), and polysilazane. Secondly, the ablation properties of RTV phenyl silicone rubber were studied by the muffle roaster test and FT-IR. Thirdly, thermal stability of the three samples was studied by thermogravimetric (TG) analysis. Finally, to explore the thermal degradation mechanism, the RTV phenyl silicone rubber vulcanized by different crosslinking agents were characterized by TG analysis-mass spectrum (TG-MS) and pyrolysis gas chromatogram-mass spectrum (pyGC-MS). Results showed that the thermal stability of RTV phenyl silicone rubber is related to the amount of residual Si-OH groups. The residual Si OH groups initiated the polysiloxane chain degradation via an 'unzipping' mechanism.

引用

页数：13

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