CRYSTALLIZATION OF POLYETHYLENE AT HIGH PRESSURE: A KINETIC VIEW.

P. D. Calvert, D. R. Uhlmann

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

A model for the crystallization kinetics of polymers is outlined and is used to interpret observations of the crystallization of PE at high pressures. This model introduces a distinction between sigma //e the lamellar surface energy which controls the lamellar thickness, and sigma //e', the surface nucleus surface energy which controls the growth rate. Differential scanning calorimetry and electron microscopy data for several polyethylenes crystallized at pressures of up to 8 kb are preseinted. It is found that sigma //e increases markedly with pressure leading to the formation of very thick crystals at high pressures. Fractionation effects and the differences in behavior between different polyethylenes are also discussed.

Original languageEnglish (US)
Pages (from-to)1811-1836
Number of pages26
JournalJ Polym Sci Part A-2 Polym Phys
Volume10
Issue number9
StatePublished - Sep 1 1972
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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