title: Measurements of diffusion in porous polyethylene powder using PFGSTE NMR.
abstract: Pulsed field gradient stimulated echo (PFGSTE) nuclear magnetic resonance (NMR) has been applied to study the diffusion of toluene in porous semicrystalline polyethylene powder. A pulse sequence with unequal bipolar gradients that reduces effects from internal gradients was used. The effects of different diffusion regimens and restricted diffusion in this system were indicated by use of a simple two-component analysis of the diffusion data.
authors.affiliation: Department of Physical Chemistry, Norwegian University of Science and Technology, Trondheim, Norway. johnsel@chembio.ntnu.no
authors.forename: J G
authors.initials: JG
authors.lastname: Seland
authors.forename: B
authors.initials: B
authors.lastname: Hafskjold
mesh_terms: D003460:Crystallization; D004058:Diffusion; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D011095:Polyethylenes; D016062:Porosity; D011208:Powders; D014050:Toluene
chemical_list: D011095:Polyethylenes; D011208:Powders; D014050:Toluene