【摘要】 以球形高效负载的TiCl4/MgCl2/邻苯二甲酸二异丁酯(DIBP)为催化剂,采用本体聚合方法进行丙烯与1-丁烯共聚合研究.考察了共单体效应对共聚活性及聚合物立构规整性的影响;表征了共聚物的结构.结果表明,随着1-丁烯/丙烯投料比的增加,聚合活性呈先升高后降低的趋势,在1-丁烯/丙烯摩尔投料比为0.26条件下聚合活性达到最高,并随着共聚物中1-丁烯含量的增加,共聚物的熔点明显下降,分子量降低,分子量分布变窄,同时共聚物力学性能有明显提高,透明度逐渐增加.更多还原

【Abstract】 The spherical MgCl2 supported TiCl4catalyst( TiCl4/MgCl2/DIBP) was applied to bulk copolymerization of propylene and 1-butene. The influence of comonomer feed ratio on catalyst activity and stereoregularity of the copolymers were studied. The composition and properties of copolymers were investigated by13 C nuclear magnetic resonance(13C NMR),differential scanning calorimetry( DSC),infrared( IR) and gel permeation chromatography( GPC). The results showed that the polymerization activity increased firstly and then decreased with the increasing 1-butene /propylene feed ratio( B /P). The highest polymerization activity was achieved at B /P = 0. 26. As the 1-butene content in the copolymers increased,the melting point of the copolymers decreased and the molecular weight distribution became narrow. Meanwhile,the mechanical properties of the copolymers were improved significantly,and the transparency was gradually increased.更多还原