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乙丙橡胶的性能不仅取决于共聚物的组成、分子量及其分布,而且依赖于共聚物的微结构。Natta等认为共聚物中乙烯和丙烯单体链节呈无规分布时可获得性能最好的弹性体。但因催化剂及聚合条件不同,共聚物的单体链节总是存在不同程度的无规、交替及长序列分布。本文采用红外吸收光谱研究了乙丙共聚物的组成及不同催化体系和加入添加剂后对乙丙共聚物序列分布的影响。
The properties of ethylene-propylene rubber depend not only on the composition, molecular weight and distribution of the copolymer, but also on the microstructure of the copolymer. Natta et al. Found that the best performing elastomers were obtained when the chain lengths of ethylene and propylene monomer were randomly distributed in the copolymer. However, due to the different catalyst and polymerization conditions, the copolymer monomer chain always exists in varying degrees of random, alternating and long sequence distribution. In this paper, the composition of ethylene-propylene copolymer and the influence of different catalytic systems and additives on the sequence distribution of ethylene-propylene copolymer were studied by infrared absorption spectroscopy.