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OALib Journal期刊
ISSN: 2333-9721
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主链含芳基均三嗪环结构杂萘联苯共聚芳醚腈的结构与性能
DOI: 10.3724/SP.J.1105.2012.12044, PP. 1283-1288
Keywords: 聚芳醚腈,三芳基均三嗪,二氮杂萘酮,结构与性能
Abstract:
以含均三嗪环结构的双氟单体2,4-二(4-氟苯基)-6-苯基-1,3,5-三嗪与商用2,6-二氟苯腈为共聚单体,与具有扭曲、非共平面结构的4-(4-羟基-苯基)-2H-二氮杂萘-1-酮(DHPZ)经溶液亲核取代逐步聚合,合成了一系列主链含三芳基均三嗪环结构和二氮杂萘酮结构线性共聚芳醚腈(PPENPs),其特性黏数为0.65~1.02dL/g;采用FTIR和1H-NMR证明了聚合物结构与设计一致.PPENPs的DSC曲线中只有一个玻璃化转变温度,在301~337℃之间,且随着分子链中三嗪环结构的增加而升高.N2气氛5%热失重温度在510℃以上,800℃残碳率大于60%.当共聚物中三嗪环含量低于50%时,在室温下可溶于N-甲基吡咯烷酮(NMP)、N,N-二甲基乙酰胺(DMAc)和氯仿(CHCl3)等极性非质子溶剂中.其薄膜的拉伸强度为72~84MPa,断裂伸长率为7.6%~11%,且随着分子链中三嗪环结构的增加而降低.
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