Photo-oxidation of polymers-I. A quantitative study of the chemical reactions resulting from irradiation of polystyrene at 253.7 nm in the presence of oxygen

Multi-dithienylethene arrays, in which two, three, or four 1,2-bis(2,4-dimethylthiophen-3-yl)perfluorocyclopentenes are ethynylene-bridged, were synthesized. Upon irradiation with ultraviolet light the hexane solutions of the arrays turned violet-blue and the color disappeared by irradiation with visible light. The quantum yields of photocyclization reactions successively increased from 0.21 to 0.40 by increasing the number of the dithienylethene moieties in the arrays from one to four. Picosecond laser photolysis as well as the fluorescence depolarization experiment confirmed that efficient excited energy migration in the arrays from the photochemically inactive parallel conformer to the photoactive antiparallel conformer resulted in the high quantum yields.

Efficient Photocyclization of Dithienylethene Dimer, Trimer, and Tetramer: Quantum Yield and Reaction Dynamics

The objective of this review is to characterize the excimer formation and energy migration processes in aryl vinyl polymers sufficiently well that the excimer probe may be used quantitatively to study polymer structure One such area of application in which some measure of success has already been achieved is in the analysis of the thermodynamics of multicomponent systems and the kinetics of phase separation In the future, it is likely that the technique will also prove fruitful in the study of structural order in liquid crystalline polymers

Photophysics of excimer formation in aryl vinyl polymers

N. Putman-de Lavareille

Papers

Luminescence studies in polymers—IV. Effect of orientation, tacticity and crystallinity on polystyrene and polyvinylcarbazole fluorescence

Luminescence studies in polymers-IX. Polarization of the fluorescence of copolymer films

Luminescence studies in polymers—VII. Exciplex formation in polyvinylnaphthalene and polyacenaphthylene☆