Ethylene polymerization and ethylene/styrene copolymerization with secondary phosphine-pendant and phosphide-pendant complexes of Zr and Hf
Ethylene polymerization and ethylene/styrene copolymerization with secondary phosphine-pendant and phosphide-pendant complexes of Zr and Hf
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DOI：
10.1016/j.molcata.2004.06.024
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发表时间：
2004-11
影响因子：
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通讯作者：
T. Ishiyama;K. Miyoshi;H. Nakazawa
中科院分区：
文献类型：
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作者：
T. Ishiyama;K. Miyoshi;H. Nakazawa
乙烯和苯乙烯的聚合和乙烯/苯乙烯的共聚用锆或铪配合物的组合得到的催化体系进行了研究，该体系带有二级膦-垂环戊二烯基配体{η5-C5H4(CH2)2P(H)R} （R = 2,4,6-三甲基苯基（Mes）），2,4,6-三（i-丙基）苯基（Tip）)或以修饰的甲基铝氧烷（MMAO）或甲基铝氧烷（MAO）和三-i-丁基铝（TIBA）的混合物为助催化剂的磷悬垂环戊二烯基配体{η5-C5H4(CH2)2PR-κP}。这些体系在乙烯聚合中表现出中等的活性（8-316gmmol−1h−1），但在苯乙烯聚合中表现出无活性。在乙烯/苯乙烯共聚中，这些体系提供了苯乙烯含量相对较高（35-87%）的乙烯/苯乙烯共聚物。
Ethylene and styrene polymerizations and ethylene/styrene copolymerization have been examined with a catalytic system obtained by a combination of zirconium or hafnium complexes bearing a secondary phosphine-pendant cyclopentadienyl ligand {η5-C5H4(CH2)2P(H)R} (R = 2,4,6-trimethylphenyl (Mes), 2,4,6-tri(i-propyl)phenyl (Tip)) or a phosphide-pendant cyclopentadienyl ligand {η5-C5H4(CH2)2PR-κP} with modified methylaluminoxane (MMAO) or a mixture of methylaluminoxane (MAO) and tri-i-butylaluminium (TIBA) as a cocatalyst. These systems show moderate activity in ethylene polymerization (8–316gmmol−1h−1) but show inactivity in styrene polymerization. In ethylene/styrene copolymerization, these systems afford ethylene/styrene copolymers with a relatively high styrene content (35–87%).