共聚单体改性PAN原丝热性能研究  

Study on pre-oxidation thermal behavior of PAN precursor by comonomer modification

作　　者：王中泽[1] 钟珊[1] 张博文[1] 刘正博 徐樑华[1] 

机构地区：[1]北京化工大学碳纤维及功能高分子教育部重点实验室,北京100029

出　　处：《化工新型材料》2017年第3期116-118,共3页New Chemical Materials

基　　金：国家重点基础研究发展计划(2011CB605602)

摘　　要：采用溴化1-烯丙基3-乙基咪唑(VIM-Br)与丙烯腈(AN)自由基溶液共聚,以偶氮二异丁腈为引发剂在二甲基亚砜中合成了聚丙烯腈(PAN)纺丝溶液,并用湿法纺丝纺制得了PAN原丝。运用差示扫描量热分析(DSC)、红外光谱(FT-IR),13 C固体核磁(13 C-NMR)研究了VIM-Br对PAN原丝预氧化热性能的影响。结果表明,在预氧化反应过程中,含有强极性Br原子的共聚单体VIM-Br能够催化环化反应,降低预氧化起始反应温度,缓和预氧化反应放热;和传统共聚单体衣康酸(IA)相比,VIM-Br的空间效应为氧气向PAN纤维内部扩散提供了分子级的通道,增加了进入纤维内部的氧气量,提高了预氧化反应程度。Bromine-1-allyl-3-ethyl-imidazolium（VIM-Br）was used as comonomer to copolymerize with acrylonitrile（AN）in dimethyl sulfoxide,and poly acrylonitrile（PAN）precursor was prepared in the means of wet spinning.The influence of VIM-Br exerted on the crystallization and thermal behavior of PAN precursor was studied by differential scanning calorimetry（DSC）,Fourier transform infrared spectroscopy（FT-IR）and 13 C solid state nuclear magnetic resonance（13 C-NMR）.The results showed that,VIM-Br can lower the initiation temperature by Br with its strong polarity,and moderate stabilization relaxed the process of pre-oxidation.Compared with the traditional comonomer itaconicacid（IA）,VIM-Br can increase the spacing of molecular chain to promote the oxygen penetrating into the fiber,which was beneficial to elevate the extent of stabilization.

关 键 词：共聚单体 溴化1-烯丙基3-乙基咪唑 聚丙烯腈 预氧化 

分 类 号：TQ342.31[化学工程—化纤工业]