采用链式聚合方法,用4,4'-偶氮.二(4-氰基戊酸)为引发剂引发苯乙烯的自由基聚合,合成了两端带有羧基基团的功能化聚苯乙烯.研究了单体、引发剂、溶剂之间的配比及聚合温度对合成端羧基聚苯乙烯的影响.并用合成得到的端羧基聚苯乙烯与聚乙二醇在室温、常压等十分温和的条件下进行酯化缩聚反应,得到聚苯乙烯/聚乙二醇两亲性嵌段共聚物.红外分析(FT-IR)和核磁共振(~1H-NMR)测试结果证实成功合成了端羧基聚苯乙烯和聚苯乙烯/聚乙二醇嵌段共聚物;凝胶渗透色谱(GPC)和差热分析(DSC)测试结果分别表明合成得到的端羧基聚苯乙烯的分子量较大、分子量分布比较均匀,并且随着分子量的增加,端羧基聚苯乙烯的玻璃化转变温度逐渐升高.
Polystyrene with carboxyl-terminated groups was synthesized via a chain-polymerization reaction by the use of styrene as the monomer and 4, 4'-azobis-4-cyanopentanoic acid(ACPA)as an initiator. The effect of proportions among styrene, ACPA and solvent as well as the polymerization temperature on the synthesis of functional polystyrene was investigated. Finally, an amphiphilic block copolymers was prepared by the polycondensation between carboxyl-terminated polystyrene and poly(ethylene glycol)under extremely mild conditions, for instance, ambient temperature and atmospheric pressure. Results from characterizations of Fourier transform infrared spectroscopic(FT-IR)and hydrogen nuclear magnetic resonance spectrum(~1H-NMR)confirms the successful synthesis of the carboxyl-terminated polystyrene and polystyrene-block-poly(ethylene glycol)copolymers. Gel permeation in chromatography(GPC)test indicates that the resulted carboxyl-terminated polystyrene has quite large molecular weight, and the molecular weight distributions are considerably quite narrow.Results from differential scanning calorimetry(DSC)show that the glass transition temperature of the resulting polystyrene enhances gradually with the increase of the molecular weight.
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