Preparation of linear low-density polyethylene by in situ copolymerization of ethylene with Zr supported on montmorillonite/Fe/methylaluminoxane catalyst system
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发布时间：2025-04-30
发布时间：2025-04-30
论文名称：Preparation of linear low-density polyethylene by in situ copolymerization of ethylene with Zr supported on montmorillonite/Fe/methylaluminoxane catalyst system
发表刊物：Journal of Applied Polymer Science
摘要：Linear low-density polyethylene (LLDPE) was prepared by in situ copolymerization of ethylene with dual-functional catalysts that were composed of rac-Et(Ind)(2)ZrCl2 supported on montmorillonite (MMT) and {[(2-ArN = C(Me))(2)C5H3N]FeCl2}[Ar = 2,4-C6H4(Me)(2)] oligomerization catalyst. A series of polyethylenes with different degrees of branching were obtained by adjusting the ratio of Fe and Zr (Fe/Zr). DSC, NMR, GPC, SEM, and density-gradient method were used to characterize the polymers. With increasing Fe/Zr ratio, the densities and melting points of polymers decreased, whereas the branching degrees and molecular weights increased. When the Fe/Zr ratio was increased, the activities of the catalysts decreased at atmospheric pressure and increased at 0.7 MPa ethylene pressure. SEM micrographs revealed that the morphology of branched polyethylene, produced with the catalyst supported on MMT, is better than that produced by the catalyst in a homogeneous system.
合写作者：Zhicheng Zhang; Cunyue Guo; Youliang Hu
卷号：Volume: 94 Issue: 4
页面范围：1690-1696
是否译文：否
发表时间：2004-11-15
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