The catalytic polymerization of phenylacetylene and p-tolylacetylene under homogeneous and heterogeneous conditions is described. The catalysts used are either (cod)Rh(AAEMA) [cod: 1,5-cyclooctadiene, AAEMA−: deprotonated form of 2-(acetoacetoxy)ethylmethacrylate] or the supported metal complex obtained by thermal copolymerization of (cod)Rh(AAEMA) with suitable comonomers and cross-linkers. Complexes of general formula (diene)Rh(acac) [diene: 2,5-norbornadiene (nbd) or 1,5-cyclooctadiene (cod)] have also been used for comparison. High yields in poly(arylacetylene) are achieved in the homogeneous phase for both substrates using THF as solvent at room temperature even in the absence of any co-catalyst. The use of the supported rhodium(I) catalyst facilitates the polymerization of arylacetylenes yielding, in the case of poly(phenylacetylene) (PPA), a polymer having high stereoregularity and higher molecular weight respect to that obtained in homogeneous phase. A new correlation between IR data and the cis-percentage of PPA is proposed and discussed.
|Titolo:||Polymerization of phenylacetylene and of p-tolylacetylene catalyzed by β-dioxygenato rhodium(I) complexes in homogeneous and heterogeneous phase|
|Data di pubblicazione:||2002|
|Digital Object Identifier (DOI):||10.1016/S1381-1169(01)00291-6|
|Appare nelle tipologie:||1.1 Articolo in rivista|