6533b7d2fe1ef96bd125f4c5

RESEARCH PRODUCT

Small-angle x-ray scattering studies of melting

E. W. FischerO. SchaumburgJerold M. SchultzH. A. Zachmann

subject

Materials scienceEthylene oxideScatteringSmall-angle X-ray scatteringGeneral EngineeringAnalytical chemistryPolyethyleneIrreversible processchemistry.chemical_compoundCrystallographychemistryCopolymerCrystalliteMelting-point depression

description

The course of melting of melt-crystallized polyethylene fractions and of a poly(ethylene oxide)-polystyrene-poly(ethylene oxide) triblock copolymer has been followed by small-angle x-ray scattering (SAXS). Changes in the intensity and shape of the SAXS curves indicated that both surface melting and melting over the full crystallite thickness (full-strand melting) take place. Full strand melting is the final, irreversible process. Comparison with an analytical model indicates that in the earlier stages of the irreversible, full-strand process the crystallites melt out randomly throughout the bulk. Later stages may occur by the simultaneous melting of a larger stack of crystallites.

yearjournalcountryeditionlanguage
1980-02-01Journal of Polymer Science: Polymer Physics Edition
https://doi.org/10.1002/pol.1980.180180207