TY - GEN
T1 - Structural evolution of deformed polyethylene studied with positrons
AU - Kobayashi, Y.
AU - Yamawaki, M.
AU - Oka, T.
AU - Sato, K.
AU - Uesugi, N.
AU - Hattori, K.
AU - Nagasawa, N.
AU - Washio, M.
N1 - Funding Information:
1Research Institute for Science and Engineering, Faculty of Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555, Japan 2National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan 3Institute of Excellence in Higher Education and Department of Chemistry, Tohoku University, Sendai, Miyagi 980-8578 & 8576, Japan 4Department of Environmental Sciences, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan 5TOYO SEIKO Co. Ltd, Yatomi, Aichi 490-1412, Japan 6Takasaki Advanced Radiation Research Institute, National Institutes of Quantum and Radiological Science and Technology (QST), Takasaki, Gunma 370-1292, Japan
Funding Information:
This work was supported by JSPS KAKENHI Grant Number 17K05123. Drs. K. Michishio, B. E. O’Rourke, N. Oshima, R. Suzuki of AIST and Prof. T. Ougizawa of the Tokyo Institute of Technology are acknowledged for enlightening suggestions and encouragement.
Publisher Copyright:
© 2019 Author(s).
PY - 2019/12/27
Y1 - 2019/12/27
N2 - 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.
AB - 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.
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U2 - 10.1063/1.5135863
DO - 10.1063/1.5135863
M3 - Conference contribution
AN - SCOPUS:85077844266
T3 - AIP Conference Proceedings
BT - 18th International Conference on Positron Annihilation, ICPA 2018
PB - American Institute of Physics Inc.
T2 - 18th International Conference on Positron Annihilation: Positron Annihilation Spectroscopy-Fundamentals, Techniques ad Applications, ICPA 2018
Y2 - 19 August 2018 through 24 August 2018
ER -