丙烯腈与衣康酸的共聚合

STUDY ON AN- IA COPOLYMERIZATION IN DMSO SOLUTION

以偶氮二异丁腈为引发剂 ,研究了丙烯腈与衣康酸在溶剂二甲基亚砜中的自由基溶液共聚合反应 .考察了单体浓度、引发剂浓度、反应温度和时间等对共聚反应的影响 ,分别用乌氏粘度计和玻璃粘度管测定了共聚物的相对分子质量和粘度 .结果表明该反应符合自由基溶液共聚反应的一般规律 :随着引发剂浓度的增加 ,单体转化率增加 ,但共聚物的相对分子质量下降 ;随着反应温度的升高 ,聚合速率提高 ,而相对分子质量下降 .该反应的最佳条件是 :在 60℃ ,控制引发剂和单体的浓度分别为 1 %和 2 2 % ,反应时间为 8h.经理论计算 ,共聚单体衣康酸应连续补加入反应器中 。

Free-radical solution copolymerization of itaconic acid and acrylonitrile is carried out in DMSO at definite temperature using azodiisobutyronitrile( AIBN) as the initiator.The effectof monomer concentration,reaction temperature and time and initiator on copolymerization is studied.Ithas been shown thatthe concentration of AIBN increas- es with increase of conversion,but relative molecular mass of resulted in copolymer de- creases,conversely.On the other hand,the rate of copolymerization and conversion in- crease as reaction temperature increases,but higher temperature results in lower relative molecular mass.The ideal condition to the copolymerization should be controlled the con- centration of AIBN and monomersof1 % and2 2 % ,respectively,at60℃ with reaction time about8h.In order to control the distribution ofcomposition among the polymeric chains, itaconic acid should be introduced ata controlled rate into the reaction vessel.