ملخص: The present work concerns the photodegradation of macromolecules having phenyl and carbonyl groups along the main chain. The photochemical behaviour of different polyketones is expected to give useful information about the mechanisms of the reaction. With this purpose we have considered polyketones constituted of 3-oxo-1,-1 diphenylbutane-1,4 diyl (I) units regularly head to tail linked, and polyketones of 3-oxo-1-2-diphenylbutane-1-4 diyl units (II and III). The synthesis of I by hydrolysis of polymers of 3 acetoxy-1,1-diphenylbutane-1-3 diene 2a and II, III by hydrolysis of polymers of 3-acetoxy-1,2 (and 1,4)-diphenylbutane-1,3 (5a, 8a) were successful. The tests of polymerization of trimethylsiloxy monomers have not been conclusive; the photochemical behaviour of these polyketones is in good agreement with the previously observed mechanism of degradation of polyketones having [alpha] phenyl or [beta] phenyl carbonyl groups.ResumeCe travail concerne la photodegradation de polymeres possedant des groupes phenyle et carbonyle le long de la chaine principale. Le comportement photochimique des differentes polycetones doit donner des renseignements sur les mecanismes de photodegradation. C'est pourquoi des polycetones constituees d'enchainements tete-queue de motifs 3-oxo-1,1-diphenylbutane-1,4 diyle (I), 3-oxo-1,2-diphenylbutane-1,4 diyle (II) et 3-oxo-1,4-diphenylbutane-1,4 diyle (III) ont ete preparees. La synthese de ces polycetones a ete tentee par hydrolyse des polymeres du 3-acetoxy (4,4; 1,2 et 1,4) diphenylbutane 1,3 diene. Des essais de polymerisation des monomeres portant des groupes trimethylsiloxy n'ont pas ete concluants. Le comportement photochimique de ces polycetones est en bon accord avec les mecanismes precedemment observes pour la degradation des polycetones possedant un groupe phenyl en [alpha] ou[beta] du carbonyle.

لغة: فرنسية