Preparation of LLDPE by in situ copolymerization of ethylene with polymerization catalyst supported on montmorillonite
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发布时间：2025-04-30
发布时间：2025-04-30
论文名称：Preparation of LLDPE by in situ copolymerization of ethylene with polymerization catalyst supported on montmorillonite
发表刊物：Acta Polymerica Sinica
摘要：Linear 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.
合写作者：Zhicheng Zhang; Ruyi Wang; Youliang Hu
卷号：Issue 5
页面范围：713-718
是否译文：否
发表时间：2004-10-13