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Preparation of LLDPE by in situ copolymerization of ethylene with polymerization catalyst supported on montmorillonite
Zhang, ZC; Wang, RY; Ke, YC; Zheng, YS; Guo, CY; Cui, NN; Hu, YL
2004-10-01
Source PublicationACTA POLYMERICA SINICA
ISSN1000-3304
Issue5Pages:713-718
AbstractLinear low-density polyethylene (LLDPE) has been prepared by in situ copolymerization of ethylene with a dual functional catalyst, which was 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 LLDPE with different branching degrees were obtained by adjusting the molar ratio of Fe and Zr ( Fe/Zr), the molar ratio of Al and (Fe + Zr) (Al/( Fe + Zr)) as well. The kinetics curves of polymerization show that the two catalysts exhibit respective catalytic characterizations, and the activity of copolymerization catalyst is more smoothly after supported on MMT. As increasing the Fe/Zr ratio,the densities of polymers measured by density gradient method and the melting points of polymers obtained from DSC decrease. C-13-NMR shows that the polymers are LLDPE, and their branching degrees increase as the increasing of the Fe/Zr ratio. At the same time, there are some unreacted alpha-olefins in polymers, which were confirmed by C-13-NMR and GPC. The SEM shows that the polymerization catalyst supported on MMT may produce LLDPE with better morphology than that produced by the catalyst in homogeneous.
KeywordIn Situ Copolymerization Branched Polyethylene Montmorillonite
Indexed BySCI
Language英语
WOS IDWOS:000224710100018
PublisherSCIENCE CHINA PRESS
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/81892
Collection中国科学院化学研究所
Corresponding AuthorZhang, ZC
Affiliation1.Chinese Acad Sci, Inst Chem, Joint Lab Polymer Sci & Mat, Key Lab Engn Plast, Beijing 100080, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
3.Xian Jiaotong Univ, Inst Polymer, Environm & Chem Engn Sch, Xian 710049, Peoples R China
Recommended Citation
GB/T 7714
Zhang, ZC,Wang, RY,Ke, YC,et al. Preparation of LLDPE by in situ copolymerization of ethylene with polymerization catalyst supported on montmorillonite[J]. ACTA POLYMERICA SINICA,2004(5):713-718.
APA Zhang, ZC.,Wang, RY.,Ke, YC.,Zheng, YS.,Guo, CY.,...&Hu, YL.(2004).Preparation of LLDPE by in situ copolymerization of ethylene with polymerization catalyst supported on montmorillonite.ACTA POLYMERICA SINICA(5),713-718.
MLA Zhang, ZC,et al."Preparation of LLDPE by in situ copolymerization of ethylene with polymerization catalyst supported on montmorillonite".ACTA POLYMERICA SINICA .5(2004):713-718.
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