Butene-based elastomers were pre-pared by bulk polymerization of butene-1 and he-xene-1 using self-made supported titanium catalyst,and the optimization of polymerization process was studied.The structure of the copolymers was charac-terized by nuclear magnetic resonance spectrometer and differential scanning calorimetry,and the physi-cal and mechanical properties of the copolymers were investigated.The results showed that the opti-mum polymerization conditions were as follow:n(monomers)/n(catalyst)was in range of 20 000 to 25 000,n(triethylaluminum)/n(supported titanium catalyst)was in range of 250 to 300,reaction tem-perature was 45 ℃,reaction time was 4 h,hydrogen pressure was in range of 0.10 to 0.15 MPa.The copolymer contained a random copolymer structure of butene-1 and hexene-1.The copolymer had no fixed melting point.The tensile strength and elastic modulus of the copolymer decreased with the increase of the amount of hexene-1,and the nominal fracture strain of the copolymer reached 534％when the mass fraction of hexene-1 was 20％.
关键词
负载钛系催化剂/聚烯烃弹性体/丁烯-1/己烯-1/无规共聚/聚合工艺/物理机械性能
Key words
supported titanium catalyst/polyolefin elastomer/butene-1/hexene-1/random copolymeriza-tion/polymerization process/physical and mechanical property
维普
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