Macroscopically homogeneous deformation in injection molded polypropylene induced by annealing studied with microbeam X-ray scattering

Macroscopically homogeneous deformation in injection molded polypropylene induced by annealing... In a previous study (Shinohara et al., Macromolecules, 2012, 45, 1398–1407), we have found that the annealing of injection molded polypropylene makes its macroscopic deformation fairly homogeneous despite the existence of a non-oriented core layer composed of the spherulite structure. In this study, to elucidate the mechanism for the homogeneous deformation behavior induced by annealing, we conduct a scanning microbeam x-ray scattering measurement of injection molded polypropylene under uniaxial stretching and analyze the structural change at each layer for the first time. It is observed that a plastic deformation of the crystals at each layer of the annealed sample is suppressed compared to that of an as-prepared sample. Furthermore, in the highly oriented layers of the annealed sample, homogeneous cavitation accompanied by the formation of the void with a narrow size distribution is observed. We conclude that the homogeneous cavitation induces strain hardening in the oriented layers, and that the hardened oriented layers dominate the total deformation behavior. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Polymer Elsevier

Macroscopically homogeneous deformation in injection molded polypropylene induced by annealing studied with microbeam X-ray scattering

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier Ltd
ISSN
0032-3861
D.O.I.
10.1016/j.polymer.2015.06.039
Publisher site
See Article on Publisher Site

Abstract

In a previous study (Shinohara et al., Macromolecules, 2012, 45, 1398–1407), we have found that the annealing of injection molded polypropylene makes its macroscopic deformation fairly homogeneous despite the existence of a non-oriented core layer composed of the spherulite structure. In this study, to elucidate the mechanism for the homogeneous deformation behavior induced by annealing, we conduct a scanning microbeam x-ray scattering measurement of injection molded polypropylene under uniaxial stretching and analyze the structural change at each layer for the first time. It is observed that a plastic deformation of the crystals at each layer of the annealed sample is suppressed compared to that of an as-prepared sample. Furthermore, in the highly oriented layers of the annealed sample, homogeneous cavitation accompanied by the formation of the void with a narrow size distribution is observed. We conclude that the homogeneous cavitation induces strain hardening in the oriented layers, and that the hardened oriented layers dominate the total deformation behavior.

Journal

PolymerElsevier

Published: Jul 23, 2015

References

  • Macromolecules
    Zia, Q.; Mileva, D.; Androsch, R.
  • Macromolecules
    Maier, G.A.; Wallner, G.; Lang, R.W.; Fratzl, P.
  • Rev. Sci. Instrum.
    Amemiya, Y.; Ito, K.; Yagi, N.; Asano, Y.; Wakabayashi, K.; Ueki, T.; Endo, T.
  • Macromolecules
    Schrauwen, B.A.G.; Janssen, R.P.M.; Govaert, L.E.; Schrauwen, B.A.G.; Janssen, R.P.M.; Govaert, L.E.; Meijer, H.E.H.

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