title: Estimation of self-diffusion coefficients of small penetrants in semicrystalline polymers using single-sided NMR.
abstract: A simple and fast way to measure proton self-diffusion coefficients of small penetrant molecules in semicrystalline polymers is introduced. The approach takes advantage of the strong static gradient of a mobile single-sided NMR sensor and it is demonstrated on PE samples with varying degrees of crystallinity fully saturated in either toluene or n-hexane. The self-diffusion coefficients were measured using the gradient stimulated echo sequence appended with a CPMG. It is also shown for the first time, with demonstration on PE plates several millimeter thick with different aging histories, that one-dimensional profiles of self-diffusion coefficients as a function of depth can be easily obtained.
authors.affiliation: Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Templergraben 55, 52056 Aachen, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Kwamen
authors.forename: B
authors.initials: B
authors.lastname: Blümich
authors.forename: A
authors.initials: A
authors.lastname: Adams
mesh_terms: D003460:Crystallization; D004058:Diffusion; D006586:Hexanes / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D020959:Polyethylene / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D014050:Toluene / Q000737:chemistry
chemical_list: D006586:Hexanes; D011108:Polymers; C026385:n-hexane; D014050:Toluene; D020959:Polyethylene