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首页> 外文期刊>Chemistry: A European journal >Polybenzimidazole-supported [Rh(cod)Cl]_2 complex:effective catalyst for the polymerization of substituted acetylenes
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Polybenzimidazole-supported [Rh(cod)Cl]_2 complex:effective catalyst for the polymerization of substituted acetylenes

机译：聚苯并咪唑负载的[Rh（cod）Cl] _2配合物：取代乙炔聚合的有效催化剂

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摘要

The first heterogeneous catalyst which affords polymerization of substituted acetylenes into readily available high molecular weight polymers is reported. The catalyst (Rh/PBI) has been prepared by supporting di-#mu#-chloro-bis(#eta#~4-cycloocta-1,5-diene)dirhodium(I), [Rh(cod)Cl_2]_2, on commercial polybenzimidazole (PBI) porous beads by means of a simple quantitative adsorption from THF solution, and tested in polymerization of phenylacetylene, 4-fluorophenylacetylene, and 4-pentylephenylacetylene. The polymer molecules formed were found to be released from the Rh/PBI to surrounding solution during the polymerization performed in THF. Formation of high molecular weight (_W values up to 325000) polymers in prevailing cis-transoid confkguration has been observed with all monomers. In a comparison with free [Rh(cod)Cl]_2 used as the homogeneous catalyst, the Rh/PBI can be used repeatedly, exhibits somewhat lower polymerization activity but almost no oligomerization activity, and provides polymers of higher moelcular weight.
机译：报道了第一种将取代的乙炔聚合成易得的高分子量聚合物的非均相催化剂。催化剂（Rh / PBI）是通过负载二-＃mu＃-氯代双（＃eta＃〜4-环辛基-1,5-二烯）dir（I），[Rh（cod）Cl_2] _2，通过从THF溶液中进行简单定量吸附，在商用聚苯并咪唑（PBI）多孔微珠上进行了测试，并在苯基乙炔，4-氟苯基乙炔和4-戊基苯基乙炔的聚合反应中进行了测试。发现在THF中进行的聚合过程中，形成的聚合物分子从Rh / PBI释放到周围的溶液中。对于所有单体，已经观察到在主要的顺式-transoid配位中形成高分子量（M_W值高达325000）的聚合物。与游离的[Rh（cod）Cl] _2用作均相催化剂相比，Rh / PBI可以重复使用，显示出较低的聚合活性，但几乎没有低聚活性，并提供了较高分子量的聚合物。

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