文献类型：期刊文献

英文题名：Thermal curing and degradation behaviour of silicon-containing arylacetylene resins

作者：Guo, Kangkang[1,2];Li, Ping[2];Zhu, Yaping[1];Wang, Fan[1];Qi, Huimin[1]

机构：[1]East China Univ Sci & Technol, Key Lab Specially Funct Polymer Mat & Related Tec, Minist Educ, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2016

卷号：131

起止页码：98

外文期刊名：POLYMER DEGRADATION AND STABILITY

收录：;EI(收录号：20164102893313);WOS:【SCI-EXPANDED(收录号:WOS:000382408100011)】；

基金：The authors gratefully acknowledge the support of the National Science Foundation of China (Grant No.90816021).

语种：英文

外文关键词：Silicon; Arylacetylene; Cure; Degradation

摘要：Silicon-containing aryacetylene resins (PSAs) have already shown potential application as heat-resistant materials due to their excellent thermal stability. The formation and degradation of structures in cured PSAs are very important to evaluate the thermal properties during their applications. Herein, the thermal curing and degradation behavior of PSAs with different substituents were investigated by DSC, FT-IR, Py-GC-MS, TGA and TG-GC-MS. DSC and FT-IR analysis reveals that the curing reaction is dominated by the crosslinking reaction of C C-H and Si-C C-, meanwhile, the reactive substituents (such as Si-H and Si-CH=CH2) could promote the C C-H and Si-C C- reaction with higher conversion. Py-GC-MS was used to detect the pyrolysis products at 650 degrees C and 750 degrees C, respectively, and the results could provide important information about the curing reaction and structures of cured PSAs. The curing reaction of PSAs mainly contains cyclotrimerization and Diels-Alder reaction of C C-H and Si-C C-, and some addition reaction to form polyene structure. The main structures in cured PSAs contain a lot of phenyl rings, some aromatic fused rings and a little of polyene structure, moreover, their contents in cured PSAs are dependent on the substituents of the precursors. The TGA results show that the substituents of Si-H and Si-CH=CH2 can effectively improve the crosslinking index of the cured PSA-H and PSA-V, and endow them with better thermal stability. Additionally, the degradation behavior of cured PSAs have been well studied by TG-GC-MS. When the temperature is 400 degrees C, the Si-CH3 and some aliphatic structure begin to degrade and form CH4, and with the temperature increasing to 500 degrees C, the unsaturated and aliphatic structures decompose into C2H4 and C2H6, and after 600 degrees C, the aromatic rings and fused rings in cured PSAs are dehydrogenated and release H-2. In addition, the content of the degradation products and their forming temperature are also related with the substituents. (C) 2016 Elsevier Ltd. All rights reserved.