Energy Transfer in Polymeric Ketones in the Solid Phase
Energy transfer studies in polymeric systems have indicated that effective stabilization of polymer molecules against the action of ultra-violet radiation may be possible by this mechanism.(1,2,3) However, most of the definitive studies on the quenching of excited states in polymers have been carried out in dilute solution, and it seemed important to establish that similar energy exchange is possible in the bulk polymer phase. Studies were therefore carried out on the exchange of electronic energy to and from the ketone carbonyl chromophore in solid polymer films. The polymers used were copolymers of ethylene and carbon monoxide containing about 1% ketone carbonyl in the backbone of what is essentially a branched polyethylene chain. The photochemistry of these polymers has been studied extensively by Hartley and Guillet (4, 5) and it was shown that two major photo- chemical reactions occurred, the Type I giving two free radicals, and the Type II producing a double bond and lower ketone. In solution both reactions cause a reduction in molecular weight of the polymer. Energy exchange studies in hydrocarbon solution were reported more recently by Heskins and Guillet. (1,2)
KeywordsEnergy Transfer Process Aliphatic Ketone Ketone Carbonyl Energy Transfer Study Solution Solid Film
Unable to display preview. Download preview PDF.