title: A method for analysing proton NMR relaxation data from motionally heterogenous polymer systems.
abstract: Historically, the results of studies of the motional processes present in polymers above the glass transition temperature (Tg) by proton NMR spin-lattice relaxation in either the laboratory or rotating frames (T1 or T1p) have shown poor agreement with the results from similar studies carried out using other techniques such as dielectric or mechanical relaxation. We believe that this is mainly because of the complication of the NMR results due to magnetisation transport, either by spin diffusion or by bulk diffusion of the polymer. We suggest a novel approach to the analysis of proton NMR relaxation data from a motionally heterogeneous polymer, and show that the results of such an analysis are intrinsically reasonable and of the form expected for dielectric or mechanical relaxation.
authors.affiliation: IRC in Polymer Science and Technology, Department of Chemistry, University of Durham, UK.
authors.forename: M
authors.initials: M
authors.lastname: Geppi
authors.forename: R K
authors.initials: RK
authors.lastname: Harris
authors.forename: A M
authors.initials: AM
authors.lastname: Kenwright
authors.forename: B J
authors.initials: BJ
authors.lastname: Say
mesh_terms: D004563:Electrochemistry; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D019563:Mechanics; D009038:Motion; D011108:Polymers / Q000737:chemistry*; D011522:Protons; D013696:Temperature
chemical_list: D011108:Polymers; D011522:Protons