ICCAS OpenIR
Copolymerization of ethylene and propylene with (CpCH2CH2CH = CH2)(2)MCl2 (M = Zr, Hf) and Cp2ZrCl2 catalysts
Yao, H; Xiao, SJ
2000-03-01
Source PublicationCHINESE JOURNAL OF POLYMER SCIENCE
ISSN0256-7679
Volume18Issue:2Pages:169-175
Abstract(CpCH2CH2CH = CH2)(2)MCl2(M = Zr, Hf)/MAO and Cp2ZrCl2/MAO (Cp = cyclopentadienyl; MAO = methylaluminoxane) catalyst systems have been compared for ethylene copolymerization to investigate the influence of the ligand and transition metal on the polymerization activity and copolymer properties. For both CH2CH2CH = CH2 substituted catalysts the catalytic activity decreased with increasing propene concentration in the feed. The activity of the hafnocene catalyst was 6 similar to 8 times lower than that of the analogous zirconocene catalyst, C-13 NMR analysis showed that the copolymer obtained using the unsubstituted catalyst Cp2ZrCl2, has greater incorporatien of propene than those produced by CH2CH2,CH = CH2 substituted Zr and Hf catalysts. The melting point, crystallinity and the viscosity-average molecular weight of the copolymer decreased with an increase of propene concentration in the feed. Both CH2CH2CH = CH2 substituted Zr and Hf catalysts exhibit little or no difference in the melting point and crystallinity of the produced copolymers. However, there are significant differences between the two zirconocene catalysts. The copolymer produced by Cp2ZrCl2 catalyst have much lower T-m and X-c than those obtained with the (CpCH2CH2CH = CH2)(2)ZrCl2 catalyst. The density and molecular weight of the copolymer decreased in the order: (CpCH2CH2CH = CH2)(2)HfCl2>(CpCH2CH2CH = CH2)(2)ZrCl2>Cp2ZrCl2. The kinetic behavior of copolymerizaton with Hf catalyst was found to be different from that with Zr catalyst.
KeywordMetallocene Catalyst Ethylene/propylene Copolymerization Methylaluminoxane
Indexed BySCI
Language英语
WOS IDWOS:000085850700012
PublisherSPRINGER-VERLAG SINGAPORE PTE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/76064
Collection中国科学院化学研究所
Corresponding AuthorXiao, SJ
AffiliationChinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Yao, H,Xiao, SJ. Copolymerization of ethylene and propylene with (CpCH2CH2CH = CH2)(2)MCl2 (M = Zr, Hf) and Cp2ZrCl2 catalysts[J]. CHINESE JOURNAL OF POLYMER SCIENCE,2000,18(2):169-175.
APA Yao, H,&Xiao, SJ.(2000).Copolymerization of ethylene and propylene with (CpCH2CH2CH = CH2)(2)MCl2 (M = Zr, Hf) and Cp2ZrCl2 catalysts.CHINESE JOURNAL OF POLYMER SCIENCE,18(2),169-175.
MLA Yao, H,et al."Copolymerization of ethylene and propylene with (CpCH2CH2CH = CH2)(2)MCl2 (M = Zr, Hf) and Cp2ZrCl2 catalysts".CHINESE JOURNAL OF POLYMER SCIENCE 18.2(2000):169-175.
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