Free volume change of elongated polyethylene films studied using a positron probe microanalyzer

Toshitaka Oka, Nagayasu Oshima, Ryoichi Suzuki, Akira Uedono, Masanori Fujinami, Yoshinori Kobayashi

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Abstract

Free volume change of low density polyethylene (LDPE) and high density polyethylene (HDPE) films upon mechanical deformation was microscopically investigated by positron probe microanalysis (PPMA). The ortho-positronium (o-Ps) lifetimes were gradually shortened by uniaxial deformation, indicative of shrinkage of the free volume. The o-Ps intensity for HDPE increased by deformation, whereas that for LDPE varied little. It suggests that destruction of crystallites plays an important role in the deformation of HDPE. PPMA is demonstrated to be a promising, powerful probe investigating free volume changes, at different local points subjected to different degrees of deformation, in elongated polymers.

Original languageEnglish
Article number203108
JournalApplied Physics Letters
Volume101
Issue number20
DOIs
Publication statusPublished - 2012 Nov 12
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Oka, T., Oshima, N., Suzuki, R., Uedono, A., Fujinami, M., & Kobayashi, Y. (2012). Free volume change of elongated polyethylene films studied using a positron probe microanalyzer. Applied Physics Letters, 101(20), [203108]. https://doi.org/10.1063/1.4766457