低分子量AN/AA共聚物的制备

Preparation of Low Molecular Weight AN/AA Copolymer

以过硫酸钾—亚硫酸氢钠的氧化还原体系为引发剂,采用水相沉淀聚合法制备了AN/AA共聚物,用不同链转移剂控制共聚物的分子量。研究了反应时间、引发剂含量、链转移剂含量对聚合物转化率以及聚合物分子量的影响。结果表明,选用N,N-二乙基羟胺为链转移剂,其用量为5%,反应时间为2 h时,共聚物分子量最小,控制在15000左右。

The paper studied the system of potassium persulfate - sodium hydrogen sulfite as initiator, We prepared the binary copolymer of acrylonitrile -acrylic acid by water phase precipitation polymerization, to which we introduced chain transfer agents for controling the polymer＇s molecular weight. We studied the effects of reaction time, the content of the initiator, the chain transfer agent content on the polymer conversion rate and molecular weight. The results show that： we control oligomers molecular weight of about 15000 via selecting N, N-diethylhydroxylamine as chain transfer agent in an amount of 5 %, and the reaction time was 2 h.