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Journal of Materials Science

, Volume 31, Issue 14, pp 3813–3819 | Cite as

Effects of hydrostatic extrusion on the mechanical and thermal properties of polypropylene

  • T. Ariyama
Article

Abstract

The structure change in spherulites for hydrostatically extruded polypropylene (PP) was studied by the use of internal friction measurements and thermophotometry tests. The onset temperature of the β-loss peak of the PP sample decreases with increasing reduction in area, R. For the extrudates below R=50%, the peak temperature of α-loss shifts to lower temperature. The α and β absorptions for the extrudates up to R=50% become broad and overlap with each other. The intensity of the β-loss peak, Δmax, is maximum for the extrudate with R=50%. The results of tan δ, damping, and the intensity of the β-loss peak indicate that the mechanism of molecular chain deformation is divided into two stages, below and above R=50%. The results are due to spherulitic changes, i.e. the shape of spherulites changed from spherical to elliptical in the extrudates above R=50% and the spherulite with R=50% changed from coarse structure to a finer one by the imposition of hydrostatic pressure.

Keywords

Polymer Structure Change Polypropylene Thermal Property Hydrostatic Pressure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1996

Authors and Affiliations

  • T. Ariyama
    • 1
  1. 1.Department of Mechanical Engineering, Faculty of EngineeringScience University of TokyoTokyoJapan

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