Phase distribution in polyethylene versus temperature probed by solid-state proton NMR free induction decay

The change in the solid-state proton NMR Free Induction Decay signal of a polyethylene sample while heating from 360 to approximately 400K was investigated. The crystallinity, as determined by model fit, decreases approximately linearly with increasing temperature up to 393K. At higher temperature,...

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Bibliographic Details
Published inPolymer (Guilford) Vol. 41; no. 1; pp. 311 - 321
Main Authors Kristiansen, P.E, Hansen, E.W, Pedersen, B
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 01.01.2000
Elsevier
Subjects
Applied sciences
Crystalline phase
Exact sciences and technology
Free induction decay
Organic polymers
Physicochemistry of polymers
Properties and characterization
Spin–spin relaxation
Structure, morphology and analysis
Spin–spin relaxation
Crystalline phase
Free induction decay
Solid state
Polyethylene
Free induction
Investigation method
Supramolecular structure
Temperature effect
Proton
NMR spectrometry
Crystallinity
Semicrystalline polymer
Experimental study
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Summary:The change in the solid-state proton NMR Free Induction Decay signal of a polyethylene sample while heating from 360 to approximately 400K was investigated. The crystallinity, as determined by model fit, decreases approximately linearly with increasing temperature up to 393K. At higher temperature, the crystallinity decreases faster with increasing temperature. Within the temperature region investigated, three different “phases” are identified. The change in the relative distribution of these phases versus temperature is explained quantitatively by a phase-equilibrium model. Spin–spin relaxation time measurements and second moment calculations are presented, which gives information about molecular motion within these phases.
ISSN:0032-3861
1873-2291
DOI:10.1016/S0032-3861(99)00091-9