摘要
为克服引发剂铈盐较昂贵,工业应用难的缺点,实验采用CAN-KPS复合引发体系引发丙烯腈接枝改性淀粉,采用接枝率和接枝效率作为评价接枝效果的指标,详细研究了接枝工艺及其引发剂浓度、丙烯腈单体的用量和接枝温度对接枝率和接枝效率的影响,结果表明:接枝率达130%以上,接枝效率达90%以上,可较好地代替铈盐引发剂。接枝后对接枝淀粉的结构分析表明:淀粉大分子上已接枝上丙烯腈单体;接枝反应不仅发生在淀粉的无定形区也发生在结晶区,且接枝后接枝淀粉的结晶度有所提高。
The influence of the concentration of the initiator , the dosage of acrylonitrile and grafting temperature on the grafting ratio and the grafting efficiency were researched with CAN - KPS initiation system for overcoming the defects of expensive Ce4~ and difficulty in industrial application , acting the grafting ratio and the grafting efficiency as the evaluation index. The result shows that the grafting ratio reaches above 130% , the grafting efficiency reaches above 90% and the CAN - KPS initiator can replace the Ce^4＋. The structure analysis showed that the acrylonitrile monomer had been grafted to the starch molecular; the reaction occurs on grafting crystalline area and amorphous area and the crystaflinity of grafting starch increases after grafting.
出处
《化学工程师》
CAS
2007年第1期6-8,共3页
Chemical Engineer
关键词
絮凝剂
淀粉
接枝
引发体系
flocculating agent
starch
grafting
initiation system
