H. Varghese et al., Transport properties of crosslinked acrylonitrile butadiene rubber/poly(ethylene-co-vinyl acetate) blends, J POL SC PP, 37(15), 1999, pp. 1815-1831
The diffusion and transport of organic solvents through crosslinked nitrile
rubber/poly(ethylene-co-vinyl acetate) (NBR/EVA) blends have been studied.
The diffusion of cyclohexanone through these blends was studied with speci
al reference to blend composition, crosslinking systems, fillers, filler lo
ading, and temperature. At room temperature the mechanism of diffusion was
found to be Fickian for cyclohexanone-NBR/EVA blend systems. However, a dev
iation from the Fickian mode of diffusion is observed at higher temperature
. The transport coefficients, namely, intrinsic diffusion coefficient (D*),
sorption coefficient (S), and permeation coefficient (P) increase with the
increase in NBR content. The sorption data have been used to estimate the
activation energies for permeation and diffusion. The van't Hoff relationsh
ip was used to determine the thermodynamic parameters. The affine and phant
om models for chemical crosslinks were used to predict the nature of crossl
inks. The experimental results were compared with the theoretical predictio
ns. The influence of penetrants transport was studied using dichloromethane
, chloroform, and carbon tetrachloride. (C) 1999 John Wiley & Sons, Inc.