文章摘要
Study on Thermal Decomposition Behavior of Phenyl Silicone Rubber by TGA
Received:August 21, 2020  Revised:August 21, 2020
DOI：10.12136/j.issn.1000-890X.2021.09.0699
Key Words: methylvinyl phenyl silicone rubber；thermal decomposition；kinetics；apparent activation energy；TGA；reaction mechanism function
Author NameAffiliationE-mail
WANG Xuerong* Shandong Nonmetallic Material Institusion wangxr126126@126.com 
WANG Qianqian Shandong Nonmetallic Material Institusion  
LIU Yunchuan Shandong Nonmetallic Material Institusion  
ZHOU Yanping Shandong Nonmetallic Material Institusion  
YAO　Kai Shandong Nonmetallic Material Institusion  
MA Yandong Shandong Nonmetallic Material Institusion  
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Abstract:
      The thermal decomposition kinetics of methylvinyl phenyl silicone rubber（phenyl silicone rubber for short） was studied based on thermogravimetric analysis（TGA）. The results showed that the thermal decomposition of phenyl silicone rubber in the air had a mass loss platform，and the thermal decomposition temperature increased with the increase of the heating rate. Using Flynn-Wall-Ozawa and Friedman methods，and under the condition that the reaction mechanism function was not involved，the average apparent activation energy（Ea） of phenyl silicone rubber at 30% ～ 70% conversion rate（α） was 178. 071 8 and 179. 826 8 kJ·mol-1 respectively. The Ea of phenyl silicone rubber calculated by maximum thermal mass loss theoretical formula of Kissinger method was 182. 633 kJ·mol-1. The Ea obtained by the three methods had good consistency. Combined with Coats-Redfern method，the thermal decomposition reaction of phenyl silicone rubber in the air was controlled by three-dimensional diffusion，and the ideal reaction mechanism function of this method should be （α）＝[（1＋α）－1/3－1]2.
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