The effect of molecular weight in the crystallization kinetics of glassy nylon 6

Philip Engler*, Stephen Howard Carr

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Crystallization of glassy nylon 6 has been investigated with differential scanning calorimetry and wide angle X‐ray diffraction in order to determine the effect of average molecular weight. Samples were prepared by quenching molten films between platens: chilled with liquid nitrogen. These films had number average molecular weights ranging from 10,000 to 42,000 and had polydispersity indices ranging from 2.0 to 3.1. Crystallization kinetics at large undercoolings were measured in terms of the systematic dependence of conversion half time, Avrami exponent and heat of crystallization. Number average molecular weight was observed to influence crystallization rate at large undercoolings through its effect on glass transition temperature. At intermediate undercoolings, molecular weight affected crystallization rate through terms other than the glass transition temperature. In addition, a dependence on the degree of order of the macromolecules, both prior to and after crystallization, was observed.

Original languageEnglish (US)
Pages (from-to)450-456
Number of pages7
JournalPolymer Engineering & Science
Volume18
Issue number6
DOIs
StatePublished - Jan 1 1978

ASJC Scopus subject areas

  • Chemistry(all)
  • Polymers and Plastics
  • Materials Chemistry

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