Orientation in amorphous polymers I. Preparation and testing of oriented samples

J. S. Vrentas, C. M. Vrentas, A. H. Bhombal, M. S. Lahalih

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Orientation effects in amorphous polystyrene are studied using a uniaxial stretching experiment. The rheological properties of the polymer are determined from an analysis of creep data obtained from the tensile apparatus, and oriented polymer samples are prepared at different extension ratios and rates of stretching. From birefringence and tensile strength measurements on oriented samples of polystyrene, it is shown that the tensile strength is not a unique function of the birefringence. It is proposed that the tensile strength may depend not only on the average orientation, as reflected by the birefringence, but on which portion of the relaxation spectrum is preferentially oriented.

Original languageEnglish (US)
Pages (from-to)956-964
Number of pages9
JournalPolymer Engineering & Science
Issue number12
StatePublished - Aug 1984

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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