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Ziegler-Natta Catalysts: Regioselectivity and 'Hydrogen Response'

机译:Ziegler-Natta催化剂:区域选择性和“氢反应”

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摘要

Advanced High Throughput Experimentation (HTE) methods were applied to quantify the regioselectivity and the so-called "hydrogen response" in propene polymerization of four Ziegler-Natta catalysts representative of the three latest industrial generations (i.e., modified with a dialkyl phthalate, 1,3-dimethoxypropane or dialkyl succinate Internal Donor), used in combination with AlEt3 and a library of eight alkoxysilane External Donors with large structural diversity. At odds with stereo selectivity, regioselectivity turned out to be only modestly impacted by the chemical structure of the electron donors used as surface modifiers. A clear and simple relationship between regioselectivity and "hydrogen response", and, therefore, polymer molecular weight modulation was highlighted.
机译:应用先进的高通量实验(HTE)方法以量化丙烯聚合的四个Ziegler-Natta催化剂的丙烯聚合中的区域选择性和所谓的“氢反应”(即用邻苯二甲酸二烷酸二烷酸二甲酸酯改性,1, 3-二甲氧基丙烷或二烷基琥珀酸酯内部供体),与Alet3组合使用,具有大结构多样性的8个烷氧基硅烷外部供体。 在具有立体选择性的赔率下,目前的区域选择性仅受到用作表面改性剂的电子供体的化学结构的谦逊。 突出了区域选择性和“氢反应”之间的清晰简单的关系,以及因此聚合物分子量调节。

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