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本工作用核磁共振(~(13)C-NMR)、示差扫描量热(DSC)、动态力学分析(DMA)和扫描电子显微镜(SEM)等技术研究了将丙烯、乙烯单体两步分段共聚、预期为聚丙烯-聚乙烯嵌段共聚物的合成物(简称为聚丙烯-聚乙烯嵌段共聚物或嵌段共聚物)。结果表明,在嵌段共聚物中含有一定量的、能为正庚烷抽提出来的乙丙无规共聚物(EPR);分段共聚的产物并非预想的PP-b-PE两嵌段共聚物,而是含有多种组分的共混物;形态表征的结果表明了嵌段共聚物为多相体系,EPR和PE形成分散相以球形无规分布于PP基体中。
In this work, two steps of propylene and ethylene monomer were studied by 1H NMR, ~ 13 C-NMR, DSC, DMA and SEM. Copolymerization is expected to be a polypropylene-polyethylene block copolymer composition (abbreviated to polypropylene-polyethylene block copolymer or block copolymer). The results show that the block copolymer contains a certain amount of ethylene-propylene random copolymer (EPR) which can be extracted from n-heptane. The product of segmented copolymerization is not the expected PP-b-PE diblock copolymerization The results of morphological characterization showed that the block copolymers were heterogeneous, and the dispersed phases of EPR and PE were spherically distributed in the PP matrix.