以过硫酸铵(APS)为引发剂,丙烯腈(AN)与衣康酸(IA)为聚合反应单体,采用少量水(不超过10%)和二甲基亚砜(DMSO)作为混合溶剂,进行均相溶液聚合制备聚丙烯腈(PAN)共聚物。研究了AN与IA共聚反应动力学规律,绘制了转化率-时间曲线,建立了聚合反应速率方程,探究了温度对聚合速率的影响。结果表明:随着引发剂浓度和总单体浓度升高,聚合反应转化率增加;随着共聚单体IA含量的增多,聚合反应转化率下降;随水含量的增多,转化率先升高后降低;随温度升高,聚合反应速率常数增大,计算得到反应活化能为127.61kJ/mol;该聚合反应速率方程为:R_p∝[APS]^0.924[M]^1.35。

Using ammonium persulfate (APS) as the initiator,acrylonitrile (AN) and itaconic acid (IA) as polymerization monomers,and a small amount of water (not more than 10%) and dimethyl sulfoxide (DMSO) as mixed solvent,polyacrylonitrile (PAN) copolymers were prepared by homogeneous solution polymerization.The kinetics law of AN and IA copolymerization reactions were studied.The conversion-time curve was plotted.The polymerization reaction rate equation was established,and the influence of temperature on the polymerization rate was explored.It was shown that the polymerization conversion rate increased with the increase of APS content and monomer concentration.The polymerization conversion rate decreased with the increase of IA content.With the increase of water content,the polymerization conversion rate firstly increased and then decreased.With the increase of temperature,the polymerization reaction rate constant increased.The calculated activation energy of the reaction was 127.61kJ/mol.The corresponding polymerization reaction rate equation was:R_p∝[APS]^0.924[M]^1.35.