NEW STYRENE POLYMERS WITH KETO-ENOL SIDE- CHAINS .1. SYNTHESIS AND (CO)POLYMERIZATION OF BETA-DIKETONE MONOMERS

beta-diketonic monomers derived from styrene, p-vinylbenzoyltrifluoroa cetone (1), p-vinylbenzoylacetone (2), p-vinylbenzoylacetophenone (3), p-vinylphenyl)-5,5-(ethylenedioxy)hexane-1,3-dione (4) and nyl)-5-phe nyl-5,5-(ethylenedioxy)pentane-1,3-dione (5), were prepared by condens ation of p-vinylacetophenone with adequate esters. The homopolymerisat ion of these monomers essentially gives insoluble resins of low intere st in the photoreticulation field. On the contrary, their copolymerisa tion with styrene and methyl acrylate affords soluble polymers with si de chain enolised 1,3-diketonic moities allowing to expect their photo reticulation by a De Mayo reaction with p-divinylbenzene. Monomers and polymers, were characterised by H-1 NMR and C-13 NMR spectroscopies. The C-13 NMR chemical shifts were used to evaluate the Alfrey Price re activity parameters of the monomers and to calculate relative percenta ges of the enol forms in monomers and polymers. The molecular characte ristics of polymers were determined by gel permeation chromatography.