Laser Flash Photolysis Studies of Copolymers of Phenyl Vinyl Ketone and Vinylnaphthalene in Benzene Solution

Yields and lifetimes of triplet states of 2-vinylnaphthalene (2-VN) incorporated as comonomer in copolymers with phenyl vinyl ketone (PVK) were measured in benzene solution at room temperature. Samples were irradiated with 347.1-nm light flashes. Light absorbed by PVK moieties was effectively transferred to 2-VN moieties. With a copolymer sample containing about 20-mol% 2-VN and possessing at the end of the flash about 20 triplet excited 2-VN base units per macromolecule, it was possible to evidence both inter- and intramolecular T—T annihilation.The triplet energy transfer from PVK to 2-VN appeared to be accomplished predominantly by an intramolecular process possibly including energy migration along the chain within PVK segments.

[1]  M. Irie,et al.  Photosensitized Isomerization of Stilbene by Phenyl Vinyl Ketone-2-Vinylnaphthalene Copolymer , 1975 .

[2]  W. Schnabel,et al.  Laser Flash Photolysis Studies on Homo- and Copolymers of Phenyl Vinyl Ketone in Solution , 1975 .

[3]  H. Baba,et al.  Kinetic Study of Triplet–Triplet Energy Transfer in Fluid Solution by Means of Laser Pulse Photolysis , 1973 .

[4]  J. Guillet,et al.  Triplet-Triplet Annihilation and Excimer Fluorescence in Poly(naphthyl methacrylate) , 1973 .

[5]  G. Geuskens,et al.  Energy transfer in polymers—III Polyphenylvinylketone—naphthalene system , 1970 .

[6]  R. Keller,et al.  Direct determination of the extinction coefficients for triplet .rar. triplet transitions in naphthalene, phenanthrene, and triphenylene , 1969 .

[7]  R. Hochstrasser,et al.  Triplet–Triplet Energy Transfer in Ordered and Random Media , 1969 .

[8]  E. Land.  Extinction coefficients of triplet-triplet transitions , 1968, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[9]  G. Porter,et al.  The triplet state in fluid media , 1958, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[10]  W. Schnabel,et al.  On the Kinetics of Polymer Degradation in Solution. II. Laser Flash Photolysis Studies on Poly(phenyl vinyl ketone) and Butyrophenone , 1975 .

[11]  I. Lukáč,et al.  Influence of free and copolymerized triplet quenchers on the photolysis of poly(vinyl phenyl ketone) in solution , 1971 .

[12]  J. B. Birks,et al.  Photophysics of aromatic molecules , 1970 .