Solute diffusion in swollen membranes VII. Diffusion in semicrystalline networks |
| |
Authors: | R S Harland N A Peppas |
| |
Institution: | (1) Present address: School of Chemical Engineering, Purdue University, West Lafayette, Indiana, USA |
| |
Abstract: | A model is developed to express the solute diffusion coefficient through semicrystalline polymeric networks. The crystallites create impermeable diffusional barriers around the amorphous regions. Solute diffusion is determined by applying a transport model to the amorphous phase and incorporating the crosslinked polymer structure characteristics. This model is tested with theophylline and vitamin B12 permeation experiments through semicrystalline poly(vinyl alcohol) membranes prepared by annealing of amorphous PVA membranes. The degree of crystallinity varies between 23.1 % and 40.5 % on a dry basis. The solute diffusion coefficients correlate well with various parameters of the model. |
| |
Keywords: | Diffusion in polymers diffusion in networks semicrystalline polymers solute diffusion theophylline vitamin B12 |
本文献已被 SpringerLink 等数据库收录! |