Effect of non-isothermal oriented crystallization on the velocity and elongational viscosity profiles during the melt spinning of high density polyethylene fibers

A. Makradi, Said Ahzi, R. V. Gregory

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Based on the experimental data of spine line temperature and percent crystallization, a time-integral constitutive equation has been used together with the degree of phase transformation theory to predict the velocity and elongational viscosity profiles. For the velocity profile, our predicted results are compared to experimental data and good agreement is found. Under a drawing force, the elongational viscosity profile shows a stress softening due to the molecular alignment; then the fiber hardens close to the take-up point, owing to filament crystallization.

Original languageEnglish
Pages (from-to)1107-1114
Number of pages8
JournalPolymer Engineering and Science
Volume41
Issue number7
DOIs
Publication statusPublished - Jul 2001
Externally publishedYes

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Melt spinning
Polyethylene
High density polyethylenes
Crystallization
Viscosity
Molecular orientation
Fibers
Constitutive equations
Phase transitions
Temperature

ASJC Scopus subject areas

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

Cite this

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AB - Based on the experimental data of spine line temperature and percent crystallization, a time-integral constitutive equation has been used together with the degree of phase transformation theory to predict the velocity and elongational viscosity profiles. For the velocity profile, our predicted results are compared to experimental data and good agreement is found. Under a drawing force, the elongational viscosity profile shows a stress softening due to the molecular alignment; then the fiber hardens close to the take-up point, owing to filament crystallization.

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