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按阴离子活性聚合的方法,以正丁基锂为引发剂,合成了一系列不同分子量、大分子链端带有甲基丙烯酰基的聚苯乙烯大单体。大单体的分子量可通过引发剂浓度控制,分子量分布较窄。以偶氮二异丁腈为引发剂合成了聚苯乙烯大单体-丙烯酸丁酯的梳形接技共聚物(热塑性弹性体),并考察了大单体与丙烯酸丁酯溶液共聚合反应的能力。用GPC和紫外光谱对共聚物进行了确证,并测定了梳形共聚物的平均组成、数均支化度与支化度系数。按此,只要控制聚合反应条件、用一系列不同分子量的大单体与丙烯酸丁酯共聚,就能合成一系列预期侧链长度、数均支化度与支化度系数的梳形共聚物,由此就能达到高分子分子设计的目的。
According to the method of anionic living polymerization, a series of polystyrene macromonomers with different molecular weights and methacryloyl groups at the macromolecular chain end were synthesized using n-butyl lithium as initiator. The molecular weight of the macromonomer can be controlled by the initiator concentration with a narrow molecular weight distribution. Poly (styrene) macromonomer - butyl acrylate combing copolymer (thermoplastic elastomer) was synthesized using azobisisobutyronitrile as initiator, and the copolymerization of macromonomer and butyl acrylate solution ability. Copolymers were confirmed by GPC and UV spectra. The average composition, number average degree of branching and branching degree of the copolymer were determined. Therefore, as long as a series of macromonomers with different molecular weights and butyl acrylate are copolymerized under polymerization reaction conditions, a series of comb copolymers with expected side chain length, number average degree of branching and degree of branching can be synthesized, This will be able to achieve the purpose of polymer molecular design.