微量共聚单体甲基丙烯酸-N,N-二甲氨基乙酯对PAN溶液流变性能的影响  

Effect of Trace DEMA on the Rheological Properties of PAN Copolymer Spinning Dope

作　　者：杨成然[1,2] 张玉梅[1,2] 王彪[1,2] 

机构地区：[1]东华大学材料科学与工程学院,上海201620 [2]东华大学纤维材料改性国家重点实验室,上海201620

出　　处：《东华大学学报（自然科学版）》2016年第1期12-17,23,共7页Journal of Donghua University(Natural Science)

基　　金：上海市重点学科建设资助项目(B603);高等学校学科创新引智计划资助项目(111-2-04)

摘　　要：采用水相沉淀聚合法,在醋酸乙烯酯(VA)和丙烯腈(AN)聚合的基础上,加入微量第三单体甲基丙烯酸-N,N-二甲氨基乙酯(DEMA),制得聚丙烯腈三元共聚物(PANT).使用旋转流变仪对PANT/硫氰酸钠纺丝原液的流变性能进行了研究.结果表明,所得共聚物纺丝原液属于切力变稀流体,相对于常规聚丙烯腈纺丝原液,其黏度随剪切速率变化较小,切力变稀趋势不明显.随着DEMA质量分数的增加,PANT纺丝原液黏度降低.固含量在19%以下的PANT纺丝原液流变行为仍接近牛顿流体,说明DEMA单体的引入使聚丙烯腈在硫氰酸钠溶液中的溶解能力得到了提高,纺丝原液的稳定性也得到了增强,且黏流活化能降低,说明温度对共聚物成型影响相对较小,有利于成型的稳定.随着温度的升高,共聚物原液动态黏度和模量均减小.Polyacrylonitrile copolymers（PANT）were synthesized by the aqueous deposited copolymerization of acrylonitrile（AN）,vinyl acetate（VA）and trace methacrylic acid 2-（dimethylamino）ethyl ester（DEMA）.The rheological properties of obtained PANT/sodium thiocyanate solution were studied using rotational rheometer.The results show that this spinning dope belongs to a typical pseudoplastic fluid.Compared to the conventional spinning dopes,the viscosity of PANT spinning dope changes slightly when the shear rate increases and the shear-thinning behavior becomes less distinct.With the increase of DEMA content,the viscosity of PANT spinning dope decreases.The rheological properties of PANT spinning dopes with concentration below 19% are similar to Newtonian fluid which indicates that cooperation of DEMA into PAN leads to its improved dissolving capacity and enhanced stability.The flow-activation energy of PANT spinning dope is also lower,which means less influence on spinning by temperature.The viscosity and dynamic modulus of the spinning dope decrease when the temperature increases.

关 键 词：聚丙烯腈(PAN) 甲基丙烯酸-N N-二甲氨基乙酯(DEMA) 流变性能 黏流活化能 

分 类 号：TQ342.31[化学工程—化纤工业]