Rhodium-catalyzed phenylacetylene polymerization in compressed carbon dioxide

被引:38
作者
Hori, H
Six, C
Leitner, W
机构
[1] Max Planck Inst Kohlenforsch, D-45470 Mulheim, Germany
[2] Natl Inst Resources & Environm, Tsukuba, Ibaraki 3058569, Japan
关键词
D O I
10.1021/ma981723u
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Polymerization of phenylacetylene using rhodium catalysts can be carried out with high efficiency in compressed (liquid or supercritical) CO2. Using the complex [(nbd)Rh(acac)] (nbd = 12,5-norbornadiene, acac = acetyl acetonate) as a catalyst precursor, the polymerization rate in CO2 is considerably higher than in conventional solvents such as THF or hexane. The resulting polymers consist of THF-soluble (mainly cis-transoidal) and THF-insoluble (mainly cis-cisoidal) species. The polymer characteristics such as stereoregularity and molecular weight are compared to those obtained by polymerization in conventional solvents. Addition of {4-F(CF2)(6)(CH2)(2)C6H4}(3)P gives rise to a ligand-modified rhodium catalyst with high solubility in compressed CO2 and leads to an increase in selectivity toward the cis-transoidal polymer.
引用
收藏
页码:3178 / 3182
页数:5
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