Diffusion rate- pentane in polystyrene

[jackscholar]

For part of my coursework I am asked to look at gas application in polymer manufacture and while looking through sources I found articles on the use of pentane in polystyrene resin. I was wondering at what rate the pentane diffuses out of the polystyrene? Any equations would help tremendously as I can't find any online.

 

[LawrenceC]

I would say that this problem is an application of Fourier's Equation. It is similar to transient heat transfer. You'll have to obtain a diffusion coefficient.