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含有甲基丙烯酸环氧丙酯的聚合物是热活性高分子,它们可以被用来合成体型共聚物或接枝共聚物。 当甲基丙烯酸环氧丙酯、甲基丙烯酸甲酯、和甲基丙烯酸三种单体一起进行共聚合时,首先得到一种綫型的共聚物。这种共聚物经过在120℃以上热处理,就转化成一种透明的体型的共聚物,红外光谱的研究证示,在热处理时分子链间的环氧基和羧基起了反应,交联的结果使共聚物的玻璃化温度由110℃左右提高到150℃左右。 把甲基丙磷酸环氧丙酯和甲基丙烯酸甲酯的共聚物与消去末端氨基的聚己内酰胺共溶于热的苯甲醇并150℃加热,可以得到一种接枝共聚物。这种接枝共聚物一旦析出并干燥以后,在常温下不溶于包括苯甲醇、间甲苯酚在内的大多数溶剂,但却易溶于极性较强的溶剂如98％的甲酸。这个反常的表现被认为是由于分子链间氢键作用所引起的。 作为骨干的甲基丙烯酸环氧丙酯和甲基丙烯酸甲酯共聚物及其聚己内酰胺的接枝共聚物在苯甲醇及在间甲苯酚中作了溶液粘度测定,在间甲苯酚溶液内,由于接枝,Huggins常数k′值增加了;但在苯甲醇溶液内,k′值却无甚变化。这说明由于主链和枝链化学性貭的不同,溶剂对它们的作用不一样,接枝对溶液粘度的影响不能和普通的枝化高分子等 量齐观。
Polymers containing glycidyl methacrylate are heat-active polymers that can be used to synthesize bulk copolymers or graft copolymers. When the three monomers of glycidyl methacrylate, methyl methacrylate, and methacrylic acid are copolymerized together, first, a linear copolymer is obtained. This copolymer after heat treatment at 120 ℃ or more, it is transformed into a transparent body of the copolymer, infrared spectroscopy studies have shown that in the heat treatment of molecular chains between the epoxy and carboxyl react, the result of the crosslinking The glass transition temperature of the copolymer increased from about 110 ° C to about 150 ° C. A copolymer of glycidyl methacrylate and methyl methacrylate was co-dissolved with hot polycaprolactam in hot benzyl alcohol and heated at 150 ° C to obtain a graft copolymer. Once precipitated and dried, the graft copolymer is insoluble in most solvents including benzyl alcohol and m-cresol at room temperature but readily soluble in more polar solvents such as 98% formic acid. This abnormal behavior is believed to be caused by hydrogen bonding between molecular chains. The graft copolymers of glycidyl methacrylate and methyl methacrylate copolymers and their polycaprolactam as the backbone were measured for solution viscosity in benzyl alcohol and in m-cresol, and in the m-cresol solution, the Grafting, Huggins constant k ’value increased; However, benzyl alcohol solution, k’ value without any change. This shows that due to the main chain and branches of the chemical differences in the role of different solvents on their role, the grafting of the viscosity of the solution can not be the same amount as the average amount of branched polymers.