Structural evolution of deformed polyethylene studied with positrons

Y. Kobayashi, M. Yamawaki, T. Oka, K. Sato, N. Uesugi, K. Hattori, N. Nagasawa, M. Washio

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Uniaxially stretched high density polyethylene (HDPE), low density polyethylene (LDPE) and ultra-high molecular weight polyethylene (UHMWPE) were studied by positron annihilation lifetime spectroscopy (PALS). The pick-off annihilation lifetime of ortho-positronium (o-Ps) was progressively shortened by stretching. This shortening is due to development of anisotropy in sub-nm size open space (free volume) for o-Ps localization. Simple analysis by an extended Tao-Eldrup model suggests that the hole anisotropy is much less than the bulk anisotropy possibly due to structural relaxation. Correlation between the o-Ps relative intensity and lifetime points to one-stage deformation of LDPE and UHMWPE, and multiple-stage deformation of HDPE, respectively. A recently commercialized positron lifetime spectrometer, which permits PALS to be performed with a single specimen, was found to be applicable to stretched polymers.

Original languageEnglish
Title of host publication18th International Conference on Positron Annihilation, ICPA 2018
Subtitle of host publicationPositron Annihilation Spectroscopy-Fundamentals, Techniques ad Applications
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735419292
DOIs
Publication statusPublished - 2019 Dec 27
Event18th International Conference on Positron Annihilation: Positron Annihilation Spectroscopy-Fundamentals, Techniques ad Applications, ICPA 2018 - Orlando, United States
Duration: 2018 Aug 192018 Aug 24

Publication series

NameAIP Conference Proceedings
Volume2182
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference18th International Conference on Positron Annihilation: Positron Annihilation Spectroscopy-Fundamentals, Techniques ad Applications, ICPA 2018
CountryUnited States
CityOrlando
Period18/8/1918/8/24

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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