Abstract
Photodegradation in poly(methylphenylsilane) (PMPS) and poly(di-n-hexylsilane) (PDHS) films was studied by absorption and luminescence spectroscopy at T=295 and 5 K as function of wavelength, λirr, and duration of UV-irradiation, tirr. It was shown that irradiation at longer wavelengths results in the scission of the longest segments of the polymer chain, while the short-wavelength irradiation leads to the scission of both the short and the long segments. This is due to competing processes of scission of short segments and energy transfer to long segments. The conformational transformation of polymer chain of irradiated PDHS from trans-conformation into helix-conformation has been found.
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