低分子量苯乙烯──马来酸酐共聚物(SMA)的合成

Synthesis of Low molecular Weight Styrene-Maleic Anhydride Copolymer

以３－巯基丙酸为链转移剂，偶氮二异丁腈为引发剂，１，２一二氯乙烷为溶剂，采用自由基溶液共聚法合成低分子量、无异味的苯乙烯一马来酸酐共聚物。确定了聚合反应的最佳工艺条件。以产率为指标：反应温度 ８０ ℃，反应时间 ４ ｈ，引发剂用量 ３．５％，链转移剂用量 ３．０％。产率达到 ９６％以上，特性粘数为 ０．０７８；以特性粘数为指标：反应温度 ８０ ℃，反应时间 ５ ｈ，引发剂用量 ５．０％，链转移剂用量 ４．０％。产率达到９５％以上，特性粘数为 ０．０７７。

Low molecular weight weight ,odorless styrene-maleic anhydride copolymer was synthesized by free radical solution copolymerization with 3-mercaptopropinic acid as chain transfer 2.2-azoisobutyronitril as initiator 1.2-dichloroethane as solvent The influences of reac- tion temperature reaction time and amount of initiator and chain transfer on copolymerization were investigated and the optimum synthe- sis conditions were build by orthogonal test method