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首页> 外文期刊>Journal of Polymer Science, Part A. Polymer Chemistry >Preparation of linear low-density polyethylene by the In situ copolymerization of ethylene with an iron oligomerization catalyst and rac-ethylene bis(indenyl) zirconium (IV) dichloride
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Preparation of linear low-density polyethylene by the In situ copolymerization of ethylene with an iron oligomerization catalyst and rac-ethylene bis(indenyl) zirconium (IV) dichloride

机译：通过乙烯与铁低聚催化剂和外消旋乙烯双（茚基）二氯化锆（IV）原位共聚制备线性低密度聚乙烯

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摘要

An iron oligomerization catalyst, [(2-ArN C(Me))(2)C5H3N]FeCl2 [Ar = 2,6-C6H3(F)(2)], was combined with rac-ethylene bis(indenyl)zirconium (IV) dichloride [rac-Et(Ind)(2)ZrCl2] to prepare linear low-density polyethylene (LLDPE) by the in situ copolymerization of ethylene. A series of LLDPEs with different properties were prepared by the alteration of the reaction temperature, Fe/Zr molar ratio, Al/(Fe + Zr) molar ratio, and reaction time. The structures of the polymers were characterized with differential scanning calorimetry, C-13 NMR, gel permeation chromatography (GPC), and so forth. The melting points, crystallizations, and densities of the resulting products increased, and the average branching degree decreased, as the reaction temperature, Al/(Fe + Zr) ratio, and reaction time increased. The melting points, crystallizations, and densities of the polymers decreased, and the average branching degree increased, when the Fe/Zr ratio increased. The C-13 NMR and GPC results showed that there were no unreacted alpha-olefins remaining in the resulting polymers because the percentage of low-molar-mass sections (C-4-C-10) of the oligomers obtained with this catalyst was very high (>70%). In addition, the formation of polymers with two melting points under different reaction conditions was examined in detail, and the results indicated that the two melting points of the polymers could be attributed to polyethylene with different branches. (C) 2005 Wiley Periodicals, Inc.
机译：铁低聚催化剂[（2-ArN C（Me））（2）C5H3N] FeCl2 [Ar = 2,6-C6H3（F）（2）]与外消旋乙烯双（茚基）锆（IV ）二氯化物[rac-Et（Ind）（2）ZrCl2]通过乙烯原位共聚制备线性低密度聚乙烯（LLDPE）。通过改变反应温度，Fe / Zr摩尔比，Al /（Fe + Zr）摩尔比和反应时间，制备了一系列不同性质的LLDPE。用差示扫描量热法，C-13NMR，凝胶渗透色谱法（GPC）等表征聚合物的结构。随着反应温度，Al /（Fe + Zr）比和反应时间的增加，所得产物的熔点，结晶度和密度增加，平均支化度降低。当Fe / Zr比增加时，聚合物的熔点，结晶度和密度降低，平均支化度增加。 C-13 NMR和GPC结果表明，所得聚合物中没有残留未反应的α-烯烃，因为用该催化剂获得的低聚物的低摩尔质量部分（C-4-C-10）的百分比非常高。高（> 70％）。另外，详细研究了在不同反应条件下具有两个熔点的聚合物的形成，结果表明该聚合物的两个熔点可归因于具有不同支链的聚乙烯。 （C）2005 Wiley期刊公司

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