不同溶剂中的苯乙烯-马来酸酐共聚研究

Copolymerization of Styrene-Maleic Anhydride in Different Solvents

以偶氮二异丁腈为引发剂,分别以乙酸乙酯、N,N-二甲基甲酰胺、甲苯为溶剂,通过改变苯乙烯与马来酸酐的投料摩尔比,探究了苯乙烯-马来酸酐(PSMA)共聚物的合成条件对共聚物中马来酸酐单元含量的影响。利用傅立叶变换红外光谱、核磁共振氢谱、凝胶渗透色谱和热失重对共聚产物进行了表征。结果表明:以甲苯为溶剂进行沉淀聚合反应,苯乙烯和马来酸酐投料摩尔比为1∶1时,通过核磁共振氢谱计算所合成的PSMA共聚物中马来酸酐单元质量分数为46.42%,产率为75%;通过GPC测得共聚产物的重均分子量为79 697。合成的PSMA是一种低聚合度、高马来酸酐单元含量的共聚物。

Poly(styrene-co-maleic anhydride)(PSMA)copolymer was prepared in three solvents(ethylacetate,N,N-dimethylformamide and toluene)with azodiisobutyronitrile as an initiator.Effect of synthesisconditions such as the feed mole ratio of styrene to maleic anhydride on the content of maleic anhydride units inthe copolymers was investigated.The copolymerization products were characterized by Fourier transforminfrared spectroscopy,nuclear magnetic resonance spectroscopy,gel permeation chromatography andthermogravimetric analysis.The results show that when the mole ratio of styrene to maleic anhydride is 1∶1 withtoluene as a solvent of precipitation polymerization,the mass fraction of maleic anhydrideunits in the synthesizedPSMA is 46.42%and the yield is 75%calculated by nuclear magnetic resonance spectroscopy.The weight-average relative molecular mass of the product is 79 697 determined by gel permeation chromatography.Thesynthesized PSMA is a copolymer with low degree of polymerization and high content of maleic anhydrideunits.