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介绍了用2,6-二异丙基苯基苊二亚胺氯化镍/改性甲基铝氧烷(mMAO)催化乙烯制备支化聚乙烯(PE),讨论了mMAO中三甲基铝(TMA)含量、外加三异丁基铝(TIBA)以及铝镍摩尔比对催化活性、PE相对分子质量、熔点、支化度及支链类型的影响。PE的核磁共振碳谱表明,当mMAO中TMA摩尔分数小于20%时,产物的支链绝大多数为甲基支链;TMA摩尔分数增大,PE支化度增大,长支链增多;外加TIBA导致产物的长支链(支链长度大于或等于6)增多。
The preparation of branched polyethylene (PE) by ethylene catalyzed by 2,6-diisopropylphenylboronimide nickel chloride / modified methylaluminoxane (mMAO) is discussed. The effects of trimethyl aluminum (TMA), the content of TIBA and the molar ratio of aluminum to nickel on the catalytic activity, the relative molecular mass, melting point, degree of branching and branching of PE. PE NMR spectroscopy showed that when the mole fraction of TMA in mMAO was less than 20%, most of the branches of the product were methyl branches; the mole fraction of TMA increased, the degree of PE branching increased, and the long branches increased; The addition of TIBA results in an increase of the long chain branching of the product (the length of the branches is greater than or equal to 6).