氨化度对聚丙烯腈聚合进程和原液性能的影响  

Influence of ammoniation degree on polymerization process and property of PAN solution

作　　者：石金 钱鸿川 李森源 王飞翔 李常清[2] Shi Jin;Qian Hongchuan;Li Senyuan;Wang Feixiang;Li Changqing(Jiangsu Hengshen Co.,Ltd.,Danyang 212300;State Key Laboratory of Organic-Inorganic Composites,Beijing University of Chemical Technology,Beijing 100029)

机构地区：[1]江苏恒神股份有限公司,丹阳212300 [2]北京化工大学有机无机复合材料国家重点实验室,北京100029

出　　处：《化工新型材料》2021年第4期176-179,共4页New Chemical Materials

基　　金：2019年国家新材料生产应用示范平台建设项目(TC190H3ZV)。

摘　　要：聚丙烯腈(PAN)溶液是制备高性能碳纤维原丝的纺丝溶液,通过氨化改性PAN溶液进行纺丝,可获得结构均质、致密、性能优良的原丝。在丙烯腈/甲基丙烯酸甲酯/衣康酸(AN/MA/ITA)三元聚合体系中加入不同量氨水,研究不同氨化度对PAN转化率、分子量及分布、黏度和亲水性等的影响。结果表明,当氨化度低于20%时,对PAN转化率和分子量及分布影响较小;当氨化度大于20%时,PAN溶液转化率由91.73%降低至87.2%,重均分子量由28.5×10^(4)降低至24.5×10^(4),数均分子量由9.4×10^(4)降低至7.6×10^(4),分布系数由2.98升至3.4,对聚合反应进程和原液指标有明显影响。聚会体系加入氨水后,随着氨化度增加,聚合原液旋转黏度和接触角持续降低,原液旋转黏度由11.9×10^(4)cP下降至9.8×10^(4)cP,接触角由70.1°降低至60.3°,原液亲水性明显改善。Polyacrylonitrile(PAN)solution is the spinning solution to prepare precursor for carbon fiber.The precursor with homogeneous,compact structure and excellent performance can be obtained by ammoniating of PAN solution.The effects of ammoniation degrees on the conversion,molecular weight and distribution,viscosity and hydrophilicity of PAN were studied by adding different amount of ammonia into the ternary polymerization system with acrylonitrile(AN)/methyl methacrylate(MA)/itaconic acid(ITA).The results shown that when the ammoniation degree was lower than 20%,It had little effect on the conversion,molecular weight and distribution of PAN.When the ammoniation degree was greater than 20%,the conversion was decreased from 91.73%to 87.2%,MWdecreased from^(2)85000 to 245000,Mndecreased from 94000 to 76000,and distribution increased from 2.98 to 3.4.However,with the increase of ammoniation degree,the rotational viscosity and contact angle of the polymerization solution decreased continuously.The rotational viscosity of PAN solution decreased from 119000 to 98000 cP,and the contact angle of PAN solution decreased from 70.1°to 60.3°.The hydrophilicity of PAN solution changed obviously.

关 键 词：聚丙烯腈 聚合 氨化度 反应进程 原液性能 

分 类 号：TQ342.3[化学工程—化纤工业]