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H. Kaczmarek, P. Gałka, A.Wrzyszczyński, K. Olszewski, H. Janota

Effect of new photoinitiator on the courses of photochemical reactions in poly (vinyl chloride)

Polimery 2009, No 3, 202


DOI: dx.doi.org/10.14314/polimery.2009.202

Summary

A two-stage synthesis of new photoinitiator of polymer degradation, namely S-(4-benzoylphenyl)-4-methoxythiobenzoate, is presented [equation (1) and (2)]. The initiator was used for physical modification of poly(vinyl chloride) (PVC). The courses of photochemical processes going in thin films made of PVC itself or with addition of 2% of initiator were investigated by absorption spectroscopy (UV-Vis and FTIR, Fig. 1-7). It has been found that the initiator accelerated the processes of dehydrochlorination and oxidation of PVC under the influence of UV radiation of wavelength λ=254nm. The mechanism of photochemical reactions initiated in PVC by the initiator discussed was proposed.


Key words: poly(vinyl chloride), photoinitiator, photodegradation, absorption spectroscopy


e-mail: halina@chem.uni.torun.pl


H. Kaczmarek, P. Gałka, A.Wrzyszczyński, K. Olszewski, H. Janota

Effect of new photoinitiator on the courses of photochemical reactions in poly (vinyl chloride)