WEKO3
アイテム
Structural Evolution in Deformed Polyethylene Studied with Positrons
https://repo.qst.go.jp/records/72871
https://repo.qst.go.jp/records/72871dbd11932-8698-492e-a86a-0fdc7f29f9d4
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2018-07-23 | |||||
| タイトル | ||||||
| タイトル | Structural Evolution in Deformed Polyethylene Studied with Positrons | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Y.Kobayashi
× Y.Kobayashi× Yamawaki, M.× Oka, T.× Sato, K.× Uesugi, N.× Hattori, K.× Nagasawa, N.× Washio, M.× 長澤 尚胤 |
|||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Different kinds of polyethylene were subjected to uniaxial deformation and their structural evolution was investigated by positron annihilation lifetime spectroscopy (PALS) and coincident Doppler broadening spectroscopy (CDB). The pick-off annihilation lifetime of ortho-positronium (o-Ps) was progressively shortened by deformation, possibly due to anisotropic elongation of the free volume and enhanced overlap of the o-Ps wavefunction with the surrounding polyethylene molecules. The anisotropy elongation of the free volume in deformed polyethylene was also implied by CDB. The intensity of o-Ps was enhanced in high density polyethylene (HDPE) and ultra-high-molecular-weight polyethylene (UHMWPE) by deformation, but not in low density polyethylene (LDPE). This suggests that the destruction of crystallites may play a significant role in the deformation of HDPE and UHMWPE but not in LDPE. Comparison of the PALS data, obtained with two specimens sandwiching the positron source, with those obtained with a single specimen by using a commercial PALS system recently developed by Yamawaki et al confirmed the usefulness of the commercial PALS system in the study of deformed polymers. | |||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 18th International Conference on Positron Annihilation(ICPA2018) | |||||
| 発表年月日 | ||||||
| 日付 | 2018-08-20 | |||||
| 日付タイプ | Issued | |||||
