Ring-opening metathesis polymerization of norbornene with catecholato complexes of tungsten(VI) as effective catalyst precursors

被引：9
|
作者：
Nakayama, Y [1 ]
Katsuda, K [1 ]
Yasuda, H [1 ]
机构：
[1] Hiroshima Univ, Dept Appl Chem, Grad Sch Engn, Higashihiroshima 7398527, Japan
来源：
POLYMER JOURNAL | 2003年 / 35卷 / 11期
关键词：
ring-opening metathesis polymerization; norbornene; dicyclopentadiene; tungsten; catecholato; 2,6-dimethylphenoxo;
D O I：
10.1295/polymj.35.896
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Catalysis of catecholatotungsten(VI) complexes for the ring-opening metathesis polymerization (ROMP) of norbornene (NBE) and dicyclopentadiene (DCPD) was studied. Bis(catecholato) complex, WCl2(cat)(2) (2, cat = catecholato), was found to be particularly active for the ROMP of norbornene in the presence of AlEt3 as a cocatalyst to give polymers with relatively narrow molecular weight distributions. A bulky catecholato complex, WCl2((t)Bucat)(2) (3, (t)Bucat = 3,5-di-tert-butylcatecholato), afforded poly(NBE) with high cis-content. The use of modified methylaluminoxane (MMAO, Type 3A in toluene) as a cocatalyst improved activities at low temperature (-78degreesC). A mono(catecholato) complex, WCl4(cat) 1, showed high activity for the ROMP of a bulkier monomer, DCPD, to give poly(DCPD) with high cis-content.
引用
收藏
页码：896 / 900
页数：5
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