6533b821fe1ef96bd127b76a
RESEARCH PRODUCT
false
Dietmar HentschelHans Wolfgang SpiessHans Sillescusubject
Crystallinitychemistry.chemical_compoundCrystallographyMaterials sciencechemistryCarbon-13 NMR satelliteAnalytical chemistryNuclear magnetic resonance spectroscopyPolyethyleneTwo-dimensional nuclear magnetic resonance spectroscopySpectral lineAmorphous solidLine (formation)description
2D NMR spectra have been measured at variable temperatures between −100°C and +110°C in a sample of melt crystallized deuterated polyethylene (PE). The line shape could be decomposed into a central part originating from deuterons in the amorphous regions and outer parts from crystalline regions of PE. The “NMR crystallinity” determined from this separation was 72% in agreement with the X-ray crystallinity of 74%. Changes of the crystalline NMR line shape were interperted in terms of oscillations around the chain axis, the r.m.s. oscillation amplitude varying from 5° at 40°C to 12° at 110°C. The central part of the NMR line shape indicates the existence of a “narrow” and a “medium” component due to different motional processes in the amorphous regions.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1979-01-05 | Die Makromolekulare Chemie |