聚合松香HEMA酯化物与苯乙烯的共聚研究

以聚合松香(PR)与甲基丙烯酸-β-羟乙酯(HEMA)的酯化物(PRH)为单体,采用自由基溶液聚合方法制备了PRH与苯乙烯(St)的共聚物(PRHS)。探讨了单体比例、反应温度、引发剂用量和反应时间对共聚反应的影响。用红外光谱、热重分析和差示扫描量热分析对产物的结构、热稳定性和玻璃化转变温度进行了测试表征。结果表明:成功合成了酯化物PRH与St的共聚物PRHS;共聚物的热稳定性高于酯化物,苯乙烯用量越多,共聚物热稳定性和玻璃化转变温度越高;PRH与St共聚较佳的反应条件为:mPRH∶mSt=1∶2;反应温度为110℃;m(引发剂)∶m(单体)=1%;反应时间为8 h,在此条件下,产率达70.14%。

Study on copolymerization of polymerized rosin and 2-hydroxyethyl methacrylate-based ester and styrene

A copolymer （PRHS）was prepared from styrene （St）and polymerized rosin ester （PRH）,which was a product via esterification of polymerized rosin （PR）and 2-hydroxyethyl methacrylate （HEMA）,via free radical solution copolymerization.The effects of monomer ratio,reaction temperature,initiator level and reaction time on copolymerization were studied.The molecular structures,thermal stabilities,and the glass transition temperatures （Tg ）of the products were characterized by Infrared spectroscopy,thermal gravimetric analysis and differential scanning calorimetry.The results show that PRHS was prepared successfully.The thermal stability of the copolymer was better than the ester.With the increase of St level,the thermal stability and Tg of the copolymer improved.The yield could reach to 70.14% with the optimal reaction time of 8 h and temperature of 1 10 ℃ at the weight ratio of PRH to St of 1∶2 and the initiator amount of 1% （based on monomer）.