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Keggin‐Type Polyoxometalate ([PMo 12 O 40 ] 3− ) in Radical Initiating Systems: Application to Radical and Cationic Photopolymerization Reactions
Author(s) -
Xiao Pu,
Dumur Frédéric,
Tehfe MohamadAli,
Graff Bernadette,
Fouassier Jean Pierre,
Gigmes Didier,
Lalevée Jacques
Publication year - 2013
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201300282
Subject(s) - photopolymer , phosphomolybdic acid , polyoxometalate , cationic polymerization , silane , chemistry , photochemistry , silylation , radical , photodissociation , polymer , salt (chemistry) , polymer chemistry , organic chemistry , catalysis , polymerization
New photoinitiating systems based on a polyoxometalate (POM) are proposed: phosphomolybdic acid in combination with silane, germane, or iodonium salt can be used to generate silyl, germyl, or phenyl radicals as well as silylium cations. The photochemical mechanisms are studied by steady‐state photolysis and electron spin resonance. The phosphomolybdic acid/silane/iodonium salt system can initiate either the radical photopolymerization of acrylates or the cationic photopolymerization of epoxides. The synthesis of interpenetrated polymer networks can also be carried out. The mechanical properties of the synthesized polymers are affected by the presence of POM in the matrix, as shown by their dynamic mechanical analysis (DMA).