文献类型：期刊文献

英文题名：Catalytic Polymerization of Phthalonitrile Resins by Carborane with Enhanced Thermal Oxidation Resistance: Experimental and Molecular Simulation

作者：Jia, Yuxiang[1];Bu, Xiaojun[2];Dong, Junyu[1];Zhou, Quan[1];Liu, Min[1];Wang, Fang[1];Wang, Maoyuan[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Special Funct Polymer Mat & Related Techn, Minist Educ, Shanghai 200237, Peoples R China;[2]Shanghai Great Composites Technol Co Ltd, Shanghai 201400, Peoples R China

年份：2022

卷号：14

期号：1

外文期刊名：POLYMERS

收录：;EI(收录号：20220211439908);WOS:【SCI-EXPANDED(收录号:WOS:000750809800001)】；

基金：FundingThis work was supported by the Natural Science Foundation of China (52173074).

语种：英文

外文关键词：phthalonitrile resin; 1; 7-bis(hydroxymethyl)-m-carborane; cure; B-H catalysis; oxidation resistance

摘要：Biphenyl phthalonitrile (BPh) resins with good thermal and thermo-oxidative stability demonstrate great application potential in aerospace and national defense industries. However, BPh monomer has a high melting point, poor solubility, slow curing speed and high curing temperature. It is difficult to control the polymerization process to obtain the resins with high performance. Here, a BPh prepolymer (BPh-Q) was prepared by reacting 1,7-bis(hydroxymethyl)-m-carborane (QCB) with BPh monomers. The BPh-Q exhibited much better solubility, faster curing speed and lower curing temperature compared with pure BPh and BPh modified with bisphenol A (BPh-B, a common prepolymer of BPh). Thus, the polymerization process of BPh was greatly accelerated at a low temperature, resulting in a BPh resin with enhanced thermostability and oxidation resistance. The experimental and theoretical models revealed the promotion effect of B-H bond on the curing reaction of phthalonitrile via Markovnikov addition reaction due to the special steric structure of carborane. This study provided an efficient method to obtain low-temperature curing phthalonitrile resins with high thermal and thermo-oxidative resistance, which would be potentially useful for the preparation of high-performance cyanide resin-based composites.