Structural evolution of deformed polyethylene studied with positrons

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

*この研究の対応する著者

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

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.

本文言語English
ホスト出版物のタイトル18th International Conference on Positron Annihilation, ICPA 2018
ホスト出版物のサブタイトルPositron Annihilation Spectroscopy-Fundamentals, Techniques ad Applications
出版社American Institute of Physics Inc.
ISBN(電子版)9780735419292
DOI
出版ステータスPublished - 2019 12月 27
イベント18th International Conference on Positron Annihilation: Positron Annihilation Spectroscopy-Fundamentals, Techniques ad Applications, ICPA 2018 - Orlando, United States
継続期間: 2018 8月 192018 8月 24

出版物シリーズ

名前AIP Conference Proceedings
2182
ISSN(印刷版)0094-243X
ISSN(電子版)1551-7616

Conference

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

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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