Abstract
The photodegradation of thin films of poly (4-chlorostyrene) and poly (4-bromostyrene) with 265 nm radiation in the presence of oxygen and as a function of irradiation time has been studied mainly using fluorescence, FT-IR, and UV-VIS spectroscopic techniques. The influence of phthalate and terephthalate plasticizers on photo-oxidative degradation was also investigated. Phthalate and terephthalate-plasticizers were found to increase the photodegradation processes in polymeric chains. On the other hand, the intensity of absorption was also found to increase with irradiation time and in the intensity of a new absorption band at longer wavelength. The appearance of new fluorescence bands in the irradiated polymer films can well indicate a possibility of photodegradation of polymer films. In addition, the observed increase in the intensities of the carbonyl and hydroxyl regions of the FT-IR spectra, providing evidence for the photodegradation as well as the photo-oxidation of polymeric chains. The increase in the analyzed ranges was attributed to the formation of alcohols, aliphatic ketones and to the increase in the number of (C=C) that resulted from hydrogen abstraction during chains - scission.
Highlights
The study of degradation and stabilization of polymers is significant for both practical and theoritical viewpoints [1]
The aim of this work is to examine the photostability of pure and blended PBS and PCS films, which contain a small amount of doped dimethyl terephthalate, diethyl terephthalate, dioctyl terephthalate, dibutyl phthalate and dioctyl phthalate plasticizers upon UV-irradiation
The effect of UV-light irradiation on the efficiency of photochemical processes in films of pure PCS and PBS as well as in blended polymers films with 1-4% of phthalates or terephthalate plasticizers were studied by their absorption spectra
Summary
The study of degradation and stabilization of polymers is significant for both practical and theoritical viewpoints [1]. The thermal behaviour of halogenated polymers received a considerable attention, owing mainly to the industrial importance of these polymers [2,3,4,5,6]. Bromonation and chlrorination in polymer chromophore, losse the backbone helide as hydrogen helide at high temperature or during irradiation. The resulting unsaturation in the polymer backbone provides points of weakness for chain scission, which occurs at lower temperature than for polystyrene [8]. The halogenated polystyrenes have fairly similar thermal stability to polystyrene and degrade in essentially the same way giving mainly the monomer, as well as styrene and hydrogen halide [2]
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