【摘要】 合成了4种氨基硅烷类外给电子体,并用于MgCl2载体型Ziegler-Natta催化剂催化1-丁烯聚合,研究了不同外给电子体结构对催化效率和聚合物等规度、熔点、分子量及其分布的影响.结果表明,含二甲氧基的氨基硅烷类外给电子体更有助于聚(1-丁烯)等规度的提高,含二乙氧基的氨基硅烷类外给电子体可以使聚(1-丁烯)分子量分布变宽.此外,还研究了二哌啶基二甲氧基硅烷、原硅酸乙酯两种外给电子体复配对聚合的影响.研究发现,这两种外给电子体复配可以使聚合活性和聚合物等规度增加、聚合物分子量分布变宽.同时,氢气的加入量,不同的助催化剂及其加入量对以二哌啶基二甲氧基硅烷为外给电子体的聚合体系的活性和聚合物结构都有一定的影响.更多还原

【Abstract】 Four aminosilane compounds as external electron donors were synthesized and employed for 1-butene polymerization with MgCl2 supported Ziegler-Natta catalyst.The four aminosilane compounds are di(piperidinyl)dimethoxysilane(DPPDMS),di(piperidinyl)diethoxysilane(DPPDES),di(pyrrolidinyl)-dimethoxysilane(DPRDMS) and di(pyrrolidinyl)diethoxysilane(DPRDES).The effects of the structure of different external donors on the catalytic efficiency,isotacticity,melting temperature and molecular weight distribution of resulted poly(1-butene) were investigated in detail.Poly(1-butene)s have been characterized by using gel permeation chromatography(GPC) and differential scanning calorimetry(DSC) analysis.The results indicated that the aminosilane compounds possessing dimethoxy groups showed higher catalytic efficiency and isospecificity of polymers than those of compounds having diethoxy groups,whereas the aminosilane compounds containing diethoxy groups were benefit for obtaining broader molecular weight distribution polymers than those of compounds possessing dimethoxy groups.Furthermore,compared with DPPDMS or TEOS as external donor,DPPDMS/TEOS compound as complex external donor at a proper molar ratio not only increased the catalytic efficiency and isotacticity of polymers obtained,but also broadened the molecular weight distribution of the polymer.Moreover,the effects of different amount of hydrogen and concentration of external donor and cocatalyst on catalytic efficiency and isotacticity of polymers obtained were also studied.更多还原