关键词: [关键词] 无规共聚, 乙烯含量, 淤浆聚合, 聚丙烯催化剂, 无规共聚, 乙烯含量, 淤浆聚合, 乙烯, 丙烯

Abstract: The structures and properties of polypropylene random copolymers with different ethylene contents，synthesized via slurry polymerization，were characterized with FT-IR，DSC，GPC，and 13C NMR. It was demonstrated that with the increase of ethylene content in the feed gas，the polymerization activity of catalyst as well as the ethylene content in the resulting random copolymer increased，and the copolymer also changed from mainly propylene segments to mainly ethylene segments. It was also shown that when the percentage of ethylene in the feed gas was 15%～30%，the DSC data of the copolymer reached relatively lower values，the corresponding relative molecular weight was at its minimum，and the distribution of ethylene and propylene segments in the copolymer became more uniform.

Key words: [Keywords] random copolymer, Ethylene content, Slurry polymerization, Polypropylene catalyst, random copolymer, ethylene content, slurry polymerization, ethylene, proylene