Microstructure and prediction of stress-strain behaviour of cold-rolled PP sheets

S. Z. Wu, Wing Bun Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review


A constitutive equation for cold-rolled polypropylene is presented based on a modified two-phase model for semicrystalline polymer, which combines the crystalline network that obeys the Langevin based theory and the entangled network with slip-linked character. The microstructure of the rolled semicrystalline polymer consists of packed crystalline inclusions which are separated by adjacent amorphous regions. A theoretical description of the stress strain behavior is obtained by the sum of the stress effects from crystalline and entangled networks. The microstructural observations by scanning electron microscopy, X-ray pole figures and differential scanning calorimetry show that polymer chains are aligned along the rolling direction. The stress-strain equation can be obtained from the modified two-phase model and verified by experimental results.
Original languageEnglish
Pages (from-to)302-308
Number of pages7
JournalInternational Polymer Processing
Issue number3
Publication statusPublished - 1 Jan 2001

ASJC Scopus subject areas

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


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