文献类型：期刊文献

英文题名：60Co γ-rays irradiation modified p-diethynylbenzene as prepolymers to prepare polyarylacetylene with excellent heat resistance

作者：Li, Qianqian[1];Yu, Ruobing[1];Zhu, Changjin[1];Jiao, Zheng[2]

机构：[1]E China Univ Sci & Technol, Dept Mat Sci & Technol, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China;[2]Shanghai Univ, Dept Environm & Chem Engn, Shanghai 200436, Peoples R China

年份：2015

卷号：114

起止页码：81

外文期刊名：POLYMER DEGRADATION AND STABILITY

收录：;EI(收录号：20151000593088);WOS:【SCI-EXPANDED(收录号:WOS:000353734700011)】；

基金：This work was supported by the National Natural Science Foundation of China (contract grant number 51003030).

语种：英文

外文关键词：Irradiation; p-diethynylbenzene; Prepolymer; Polyarylacetylene (PAA); Exothermic heat; Heat resistance

摘要：Modified p-diethynylbenzene (p-DEB) by Co-60 gamma-rays irradiation (gamma-p-DEB) was utilized as prepolymer of polyarylacetylene (PAA) for the first time. The composition, structures and properties of prepolymers (gamma-p-DEB) and the corresponding cured PAA resins (gamma-PAA) have been investigated by mass spectrometry (MS), ultraviolet and visible spectrophotometry (UV), Fourier transform infrared (FT-IR) spectra, differential scanning calorimetry (DSC) and solid-state C-13 MAS NMR. The thermal properties have been studied by thermogravimetry (TGA). Compared with unmodified p-DEB, dimers and trimers appear in gamma-p-DEB samples and with the irradiation dose increasing, the content of conjugated structures is on the increase. gamma-p-DEB samples possess lower reaction heat and apparent activation energy of thermal polymerization, achieving the goal of avoiding explosion. gamma-PAA samples show better heat resistance than PM prepared from unmodified p-DEB, corresponding to lower sp content than PAA. Moreover, post-radiated FAA and gamma-PAA have better heat resistance than PM and gamma-PAA, due to higher cross-linking density and lower residual triples. gamma-rays irradiation is an effective way for improving the comprehensive properties of FAA. (C) 2015 Elsevier Ltd. All rights reserved.