Nuclear Magnetic Resonance (NMR) -- 2

I need a literature review on (Measurements of polymer permeability using NMR). So basically we need to understand the diffusion of polymer nanocompisites using NMR. In this case I have fumed silica and I incorporated it in HDPE (high density poly ethylene) and made a nanocomposite and now I need NMR to get permeability and diffusion characteristics.