Abstract: Hybrid catalyst was devised based on phase inversion method. The catalyst was as following: PSA was the organic part for binding (n-BuCp)2ZrCl2, and SiO2/MgCl2 was the inorganic part to immobilize TiCl3. As an alternative to a tandem or cascade type process, a two-step polymerization method was carried out in a single reactor on a laboratory scale. Utilizing this two-step slurry polymerization process, reactor blends of ultra high molecular weight copolymer and low molecular weight homo-polymer were produced. Different fractions of polymer blends were obtained according to variance of the polymerization time in each stage. The miscibility and thermal behaviors of blends were investigated by different differential scanning calorimetry (DSC) techniques and rheology methods. Finally, the miscibility of blends obtained by different blending methods was compared.

Key words: hybrid catalyst, miscibility, ultra high molecular weight polyethylene, composite support, polyethylene blends

摘要： 基于相转化法制备了复合微球载体负载的(n-BuCp)2ZrCl2/PSA/TiCl3复合催化剂。利用聚合物膜将两个传统的催化剂（茂金属和Ziegler-Natta催化剂）隔开，即先将Ziegler-Natta催化剂负载于无机载体上作为内核，随后将聚合物膜均匀沉积在无机载体催化剂表面，最后将茂金属催化剂溶液迅速负载于聚合物膜上，得到“内钛外茂”型(n-BuCp)2ZrCl2/PSA/TiCl3复合催化剂。在实验室条件下，模拟工业淤浆双釜串联反应工艺，在第一段反应中制备超高分子量(1.4×106 g/mol)高支化度的乙烯/1-己烯共聚物，在第二段反应中，制备低分子量低支化度的聚合物。调节两段反应的聚合时间，制备了不同组成的聚乙烯共混物。通过DSC和流变学的方法研究了聚乙烯共混物的共混性能，并与机械共混法得到的聚乙烯共混物的共混性质进行比较。

关键词: 复合催化剂, 共混性, 超高分子量聚乙烯, 复合载体, 聚乙烯共混物