【摘要】 以甲基铝氧烷(MAO)改性二氧化硅为载体，以具有双茚基结构的茂金属化合物为活性组分，制备得到负载型催化剂。使用扫描电子显微镜(SEM)、电感耦合等离子质谱仪(ICP-MS)、激光粒度仪等对催化剂进行分析表征，并在淤浆体系中用其催化乙烯/4-甲基-1-戊烯(4M1P)共聚反应。探究了4M1P加入量对聚合活性和产物性能的影响。利用高温凝胶渗透色谱仪(GPC)和示差扫描热分析仪(DSC)对聚合产物分析表征，并使用连续自成核退火热分级(SSA)表征产物的片晶厚度分布。结果表明二氧化硅负载乙烯基双茚基二氯化锆催化剂具有较高的活性，以4M1P为共聚单体可得到熔点更高、密度更低的茂金属聚乙烯产品。更多还原

【Abstract】 In this study,methylaluminoxane（ MAO）-modified SiO₂ was used as the carrier and metallocene compounds with diindanyl structure were used as the active components to prepare supported catalysts. The catalyst was characterized by scanning electron microscopy（ SEM）,inductively coupled plasma mass spectrometry（ ICP-MS） and laser particle size analyzer,and the catalyst was used to catalyze the copolymerization of ethylene/4-methyl-1-pentene（ 4M1P） in the slurry system. The effects of4M1P on polymerization activity and product performance were explored. The polymerization products were analysed and characterized by high-temperature gel permeation chromatography（ GPC） and differential scanning thermal analysis（ DSC）,and the lamellar thickness distribution of the products was characterized by continuous self-nucleation annealing heat fractionation（ SSA）. The results showed that the SiO₂-supported vinyl bisinylzirconium dichloride catalyst had high activity,and the metallocene polyethylene products with higher melting point and lower density could be obtained by using 4M1P as the comonomer.更多还原