[摘要]：Ethylene wits copolymerized with acrylates in solution and in emulsion using sulfonated arylphosphine Pd-based catalysts. The copolymerization of C2H4 and methyl acrylate in toluene was slowed by the sigma-coordination of the acrylateon Pd. The substitution of pyridine by itself wits shown to proceed via an associative mechanism with activation parameters Delta H double dagger = 16.8 kJ/mol and Delta S double dagger = -98 J mol(-1) K-1 whereas the activabion parameters for the Substitution of pyridine by methyl acrylate were found to be Delta H double dagger = 18.1 kJ/mol and, Delta S double dagger = -87 J mol(-1) K-1. Using these Pd-based catalysts in all emulsion polymerization process, latexes of copolymers of ethylene with various acrylates having particle diameters similar to 200 nm were obtained for the first time. Their solid contents did not exceed 5% because of the low activity of the catalyst resulting from the coordination of water and from the slow decomposition of the active site by water.
