Abstract
The effect of the spectral composition of the light on the nature of the macroradicals formed has been studied by the EPR method at low temperatures, with orientated films of polycaproamide (PA). It is shown that on irradiation of PA with ultraviolet light ∼(CH2)5—C=O radicals are formed and that these undergo photolysis in visible light with elimination of CO. The nature of the radicals formed and the laws of their formation and mutual reaction under the influence of light of different spectral composition, not absorbed by the polymer, has been studied in PA containing added FeCl3. It is shown that five types of macroradicals are formed and the structure of four of them has been established. It is concluded that degradation of the polymer molecules initiated by FeCl3 involves formation and photochemical conversion under the influence the influence of light of λ ∼ 370 nm of ∼ ∼ radicals. A scheme of the thermal and photochemical reactions of macroradicals in PA is proposed.
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