氯化聚乙烯接枝水溶性单体

采用溶胀悬浮接枝共聚法，将水溶性单体丙烯酸（AA）、丙烯酰胺（AM）接枝到疏水性氯化聚乙烯（CPE）大分子链上，合成双亲性接枝共聚物。通过正交实验法探讨了反应条件（膨胀剂、单体、引发剂和分散剂用量以及反应时间、反应温度和分散介质用量）对接枝率及接枝效率的影响规律，并用傅立叶红外光谱对接枝物进行了表征。研究结果表明，采用水作分散介质，乙酸乙醋作膨胀剂的溶胀悬浮接枝体第。在回流温度和一定搅拌速度下，可实现CPE接枝水溶性单体AA、AM且接枝（效）率较高。最佳反应条件分别为：CPE－g-AA接枝体系：CPE／AA／BPO／EA／H2O＝2／2／0．65／5／50（g/g/g/mL/mL),反应温度80℃；CPE－g-AM接枝体系：CPE／AM／BPO／EA／H2O＝2／2／0．07／8／50（g/g/g/mL/mL),反应温度72℃。反应时间均为3h。

Graft copolymerization of acrylic acid and acrylamide onto chlorinated polyethylene using the suspension grafting technique

Graft copolymerization of acrylic acid(AA) and acrylic amide(AM) onto chlorinated polyethylene(CPE) by the oil-swellable suspension graft copolymerization technique was studied, benzoyl peroxide (BPO) was used as the free radical initiator and ethyl acetate (EA) as the sweller. Optimum reaction conditions to obtain maximum grafting were evaluated. The variable factors were temperature, initiator amount, volume of sweller, monomer amount, etc. The graft copolymer was characterized by infrared spectroscopy (IR). The results showed that the oil-swellable suspension graft copolymerization technique, in which EA as sweller, can improve the degree of grafting.