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An empirical model for the diffusion of large organic molecules in and from a polymer matrix above its glass transition temperature : the Vapona-PVC system

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  • A non-linear, parabolic type, mathematical model is presented, simulating the movement of an organophosphate insecticide, Vapona, in plasticized polyvinyl chloride (PVC). The molecular transport of diffusant in the polymer matrix and its subsequent desorption from the surface have been characterized in terms of the integral rate coefficient for diffusion and surface transport respectively. Results of desorption measurements show the Vapona-PVC system to be Fickian with rate coefficients that vary exponentially with diffusant concentra­tion. Experimental results are discussed and compared with those pre­dicted from calculations on the mathematical model.
  • Published December 1973. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
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