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使用不同条件,如不同溶剂、温度、反应时间、丁基锂用量及加料次序,将氯甲基化聚苯乙烯与丁基锂反应;然后选择没有交联的产物,使其与甲基丙烯酸甲酯进行接枝聚合。另外,又用氯甲基化聚苯乙烯在金属锂的存在下与甲基丙烯酸甲酯反应。 在乙醚溶液制得的聚苯乙烯次甲基锂与甲基丙烯酸甲酯反应不能分离出聚甲基丙烯酸甲酯及它的接枝共聚物。在甲苯溶液所制得的聚苯乙烯次甲基锂(表1甲_(45)及甲_(46))与甲基丙烯酸甲酯反应,产物通过分离提钝后,由元素分析,水解与交换量测定,浊度滴定,及红外光谱证明系接枝共聚物。甲基丙烯酸甲酯约占该接枝体重量的50％左右。 氯甲基化聚苯乙烯在金属锂存在下与甲基丙烯酸甲酯反应,产物通过分离提钝后,用浊度测定、水解后滴定交换量与热机械曲线也证明是接枝共聚物,但甲基丙烯酸甲酯只占该接枝体重量的3—3.5％左右。
The chloromethylated polystyrene was reacted with butyllithium using different conditions such as different solvents, temperature, reaction time, the amount of butyllithium and the order of addition; and then the product without cross-linking was selected to react with methyl methacrylate Ester graft polymerization. In addition, chloromethylated polystyrene is reacted with methyl methacrylate in the presence of lithium metal. Polymethylmethyldithiophosphate and methylmethacrylate prepared in ether solution can not separate polymethylmethacrylate and its graft copolymer. Polystyrene methine methyllithium (Table 1, Methyl (45) and Methyl (46)) prepared in toluene solution was reacted with methyl methacrylate and the product was isolated by a blunter and analyzed by elemental analysis, hydrolysis and Exchange volume determination, turbidity titration, and infrared spectroscopy proved that the graft copolymer. Methyl methacrylate accounts for about 50% of the weight of the graft. Chloromethylated polystyrene reacts with methyl methacrylate in the presence of metallic lithium. The product is passed through a blunt separator and measured for turbidity. Titration of the exchange with thermomechanical curve after hydrolysis also proves to be a graft copolymer, however Methyl methacrylate accounts for only about 3-3.5% by weight of the graft.