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Preparation of linear low-density polyethylene by in situ copolymerization of ethylene with Zr supported on montmorillonite/Fe/methylaluminoxane catalyst system
Zhang, ZC; Guo, CY; Cui, NN; Ke, YC; Hu, YL
2004-11-15
Source PublicationJOURNAL OF APPLIED POLYMER SCIENCE
ISSN0021-8995
Volume94Issue:4Pages:1690-1696
AbstractLinear 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. (C) 2004 Wiley Periodicals, Inc.
KeywordCopolymerization Linear Low-density Polyethylene (Lldpe) Oligomers Branched Catalysts
DOI10.1002/app.21066
Indexed BySCI
Language英语
WOS IDWOS:000224224400048
PublisherJOHN WILEY & SONS INC
Citation statistics
Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/81844
Collection中国科学院化学研究所
Corresponding AuthorHu, YL
Affiliation1.Chinese Acad Sci, Ctr Mol Sci, Inst Chem, State Key Lab Engn Plast, Beijing 100080, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Zhang, ZC,Guo, CY,Cui, NN,et al. Preparation of linear low-density polyethylene by in situ copolymerization of ethylene with Zr supported on montmorillonite/Fe/methylaluminoxane catalyst system[J]. JOURNAL OF APPLIED POLYMER SCIENCE,2004,94(4):1690-1696.
APA Zhang, ZC,Guo, CY,Cui, NN,Ke, YC,&Hu, YL.(2004).Preparation of linear low-density polyethylene by in situ copolymerization of ethylene with Zr supported on montmorillonite/Fe/methylaluminoxane catalyst system.JOURNAL OF APPLIED POLYMER SCIENCE,94(4),1690-1696.
MLA Zhang, ZC,et al."Preparation of linear low-density polyethylene by in situ copolymerization of ethylene with Zr supported on montmorillonite/Fe/methylaluminoxane catalyst system".JOURNAL OF APPLIED POLYMER SCIENCE 94.4(2004):1690-1696.
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