15 December 2015 The influence of thermolysis time on the absorption spectra of polyvinyl chloride in acetophenone
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Proceedings Volume 9810, International Conference on Atomic and Molecular Pulsed Lasers XII; 98100C (2015) https://doi.org/10.1117/12.2224963
Event: XII International Conference on Atomic and Molecular Pulsed Lasers, 2015, Tomsk, Russian Federation
Abstract
The influence of thermolysis time on the absorption spectra of partially thermally dehydrochlorinated polyvinyl chloride in acetophenone solution is studied. Strong increase in the optical density Dλ of the dehydrochlorinated PVC samples is caused by the increasing amount N-C=С- and the length of chains of conjugated double bonds of carbon -C = C-. It is noted that the optical density Dλ first increases linearly with dehydrochlorination time and then reaches saturation. The estimation of amount of double conjugated carbon bonds in 1ml versus thermolysis time t is given, which varies between N-С=С- = 4·1017 – 7.4·1018 for t from 40 to 420 minutes. The effective capture cross section of a photon on conjugated double bonds of carbon for dehydrochlorinated PVC solution in acetophenone is estimated, which was about 10-17 cm2 . The analysis is done of the absorption curves «red» shift to longer wavelengths with growth of N-С=С- upon increase of thermolysis time. It is noted that the dependence of the optical density on the wavelength in this range is well described by a simple exponential function.
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S. I. Rasmagin, S. I. Rasmagin, V. I. Krasovskii, V. I. Krasovskii, D. V. Vlasov, D. V. Vlasov, L. A. Apresyan, L. A. Apresyan, T. V. Vlasova, T. V. Vlasova, V. I. Kryshtoba, V. I. Kryshtoba, I. N. Feofanov, I. N. Feofanov, M. A. Kazaryan, M. A. Kazaryan, } "The influence of thermolysis time on the absorption spectra of polyvinyl chloride in acetophenone", Proc. SPIE 9810, International Conference on Atomic and Molecular Pulsed Lasers XII, 98100C (15 December 2015); doi: 10.1117/12.2224963; https://doi.org/10.1117/12.2224963
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