文献类型：期刊文献

英文题名：Thermosetting mechanism study of silicon-containing polyarylacetylene via in situ FTIR and solid-state NMR spectroscopy

作者：You, Xintong[1];Deng, Shifeng[1];Huang, Yanchun[1];Liu, Zhongqi[1];Hu, Yanhong[1]

机构：[1]East China Univ Sci & Technol, Minist Educ, Key Lab Specially Funct Polymer Mat & Related Tec, Shanghai 200237, Peoples R China

年份：2019

卷号：136

期号：13

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;EI(收录号：20184806143058);WOS:【SCI-EXPANDED(收录号:WOS:000454418300033)】；

语种：英文

外文关键词：in situ FTIR spectroscopy; PSA; solid-state NMR spectroscopy; thermosetting mechanism

摘要：Silicon-containing polyarylacetylene (abbreviated as PSA) resins, which contain Si-(R-1, R-2) (R-1 and R-2 represent methyl or phenyl groups) and -C(sic)C-, exhibits high thermal stability upon curing up to 250 degrees C. The structure and thermosetting mechanism of PSA were characterized using FTIR, in situ FTIR, C-13 and Si-29 CP-MAS spectroscopy, and thermogravimetric analysis. From the experimental results we can conclude that: (1) biphenyl and naphthalene rings are formed via a Diels-Alder reaction between the Ph-C(sic)C and C(sic)C groups at 210 degrees C, (2) the terminal alkyne mainly transforms into ethylenic bonds at 170 and 210 degrees C, and (3) an oxidation reaction occurs to give the oxide structure (Si-O-Si) and carbon dioxide at 250 degrees C. A new curing procedure has been proposed to maximize the T-d5 up to 635.2 degrees C on that basis. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47301.