Transport of Small Molecules in Swollen Polymer Beads
The first direct measurement of the self-diffusion coefficients of solvent molecules inside swollen crosslinked polymer beads are reported. The toluene/polystyrene (PS) system was chosen for study because toluene is a good solvent for polystyrene and considerable work has been performed in the characterization of crosslinked PS beads. In addition, results are compared with measurements on non-crosslinked toluene/polystyrene solutions. The method used to probe the self-diffusion behavior of the solvent is the pulsed-field gradient spin-echo (PGSE) NMR method. The advantage of this method is that the distance scale over which the experiment is sensitive is much less than the size of the polymer beads used. The self-diffusion coefficients of the solvent are found to be slightly lower than those predicted from swelling ratios and self-diffusion coefficients of toluene in polystyrene solutions.
S. Pickup and F. D. Blum, "Transport of Small Molecules in Swollen Polymer Beads," Polymeric Materials Science and Engineering, Proceedings of the ACS Division of Polymeric Material, American Chemical Society (ACS), Jan 1985.
Article - Conference proceedings
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