The dynamics of evolution of volatile products arising during destruction of poly(viny1 alcohol) and polyacrylnitrile films under the action of cw laser radiation were investigated by means of time-of-flight mass spectrometry. It was found that the evolution of volatiles occurs in two stages, one isothermal and the other nonisothermal. Depending on laser focusing and power, the nonisothermal stage comprises three dynamic regimes of desorption of volatile products: regime of single ejection, oscillating regime and chaotic behaviour of evolution. It is shown that the various regimes of desorption are due to inhomogeneity of laser heating and nonuniform propagation of the destruction wave from the centre of the laser beam to the periphery. 0 1992, HUthig & Wepf Verlag, Basel CCC 0025-1 16X/92/$05.00
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