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首页> 外文期刊>Journal of Applied Polymer Science >Novel Monotitanocene and Methylaluminoxane Catalyst for Syndiospecific Polymerization of Styrene
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Novel Monotitanocene and Methylaluminoxane Catalyst for Syndiospecific Polymerization of Styrene

机译：新型单钛茂金属和甲基铝氧烷催化剂的苯乙烯间间特异性聚合

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摘要

Syndiotactic polystyrene (sPS) was synthesized with a novel monotit- anocene complex of #eta# 5-pentamethylcyclopentadienyltri-4-methoxyphenoxy titanium [Cp*Ti(OC_6H_4OCH_3)_3] activated by methylaluminoxane (MAO) in different poly- merization media, including heptane, toluene, chlorobenzene, and neat styrene. ID ; all cases bulk polymerization produced BPS with the highest activity and molecular weight. Solution polymerization produced much better activity in heptane than in the other solvents. Using a solvent with a higher dipole moment, such as chloro- benzene resulted in lower activity and syndiotacticity because of the stronger coordination of solvent with the Ti(III) active species, which controlled syndiospe- cific polymerization of styrene. With bulk polymerization at a higher polymerization , temperature the Cp*Ti(OC_6H_4OCH_3)_3-MAO catalyst produced BPS with high cat- alytic activity and molecular weight. The external addition of triisobutylaluminum (TIBA) to the Cp*Ti(OC_6H_4OCH_3)_3-MAO system catalyzing styrene polymerization led to significant improvement of activity at a lower AI:Ti molar ratio, while the syndiotacticity and molecular weight of the yields were little affected.
机译：间规聚苯乙烯（sPS）是由甲基铝氧烷（MAO）在不同的聚合介质（包括庚烷）中活化的＃eta＃5-五甲基甲基环戊二烯基三-4-甲氧基苯氧基钛[Cp * Ti（OC_6H_4OCH_3）_3]的新型单叔二十碳烯络合物合成的，甲苯，氯苯和纯苯乙烯。 ID ;在所有情况下，本体聚合均产生具有最高活性和分子量的BPS。溶液聚合在庚烷中产生的活性要比其他溶剂好得多。使用具有较高偶极矩的溶剂（例如氯苯）会导致活性和间同规整度降低，因为溶剂与Ti（III）活性物种之间的较强配位关系，从而控制了苯乙烯的间同聚合。在较高的聚合温度下进行本体聚合时，Cp * Ti（OC_6H_4OCH_3）_3-MAO催化剂生产的BPS具有较高的催化活性和分子量。在Cp * Ti（OC_6H_4OCH_3）_3-MAO体系中外加三异丁基铝（TIBA）催化苯乙烯聚合可在较低的AI：Ti摩尔比下显着提高活性，而间同立构规整度和收率的分子量几乎不受影响。

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