SREENIVASAN, K2017-03-102017-03-10199331 ,9;1083-108710.1002/polb.1993.090310903https://dspace.sctimst.ac.in/handle/123456789/9586An analysis of the diffusion of toluene through polyurethane based on bis(p-cyclohexyl diisocyanate), poly(tetramethylene glycol) 1000, and 1,4-butane diol, subjected to varied degrees of elongation by stretching, is presented. The diffusion coefficient is increased by 60% in polymers drawn to 200% and above. Beyond 400% elongation, the diffusion coefficient attained a constant value. Associated changes are observed in the wide-angle x-rav diffraction pattern. These diffusion and x-ray changes are correlated with restructuring of the polymer induced by stretching. (C) 1993 John Wiley & Sons, Inc.Polymer Science