|
|
JAIST Repository >
c. マテリアルサイエンス研究科・マテリアルサイエンス系 >
c10. 学術雑誌論文等 >
c10-1. 雑誌掲載論文 >
このアイテムの引用には次の識別子を使用してください:
http://hdl.handle.net/10119/12867
|
完全登録情報レコード
| ダブリン･コア･フィールド | 値 | 言語 |
|---|
| contributor.author | Huang, Tong | en_US |
| contributor.author | Miura, Motohiro | en_US |
| contributor.author | Nobukawa, Shogo | en_US |
| contributor.author | Yamaguchi, Masayuki | en_US |
| date.accessioned | 2015-08-06T00:11:48Z | - |
| date.available | 2015-08-06T00:11:48Z | - |
| date.issued | 2015-04-15 | en_US |
| identifier.uri | http://hdl.handle.net/10119/12867 | - |
| description.abstract | In this study, the effect of chain packing on tensile properties is studied employing amorphous poly(lactic acid) PLA. It is found that the samples cooled in the temperature range from 60 to 80 oC, i.e., slightly higher than the glass transition temperature T_g, show ductile behavior with a low brittle-ductile transition temperature. Furthermore, the sample obtained by prolonged cooling at 56 oC also shows ductile behavior, whereas a shorter cooling time at the same temperature leads to brittle fracture. Even for the samples quenched at 40 oC, the exposure to post-processing annealing operation at 60 oC enhances the toughness greatly, which is an anomalous phenomenon for a glassy polymer. The dynamic mechanical analysis and thermal characterization reveal that the ductile samples show slightly higher T_g than the brittle samples, presumably due to the high packing density of polymer chains. Moreover, it is found from infrared spectroscopy that the ductile samples show strong absorbance at 1267 cm-1, ascribed to high-energy gg conformers. Following the classic Robertson’s descriptions of plastic flow, it is concluded that the increase in the gg conformers, which show the conformation change under a low stress level, reduces the critical onset stress for shear yielding. The results demonstrate that the mechanical toughness of PLA can be controlled by the cooling conditions during processing and the post-processing annealing operation. | en_US |
| format.extent | 2317031 bytes | - |
| format.mimetype | application/pdf | - |
| language.iso | en | en_US |
| publisher | American Chemical Society | en_US |
| rights | Tong Huang, Motohiro Miura, Shogo Nobukawa, and Masayuki Yamaguchi, Biomacromolecules, 2015, 16(5), pp.1660-1666. This document is the unedited author's version of a Submitted Work that was subsequently accepted for publication in Biomacromolecules, copyright (c) American Chemical Society after peer review. To access the final edited and published work, see http://dx.doi.org/10.1021/acs.biomac.5b00293 | en_US |
| subject | Poly(lactic acid) | en_US |
| subject | Toughness | en_US |
| subject | Mechanical properties | en_US |
| subject | Processing | en_US |
| title | Chain packing and its anomalous effect on mechanical toughness for poly(lactic acid) | en_US |
| type.nii | Journal Article | en_US |
| identifier.niiissn | 1525-7797 | en_US |
| identifier.jtitle | Biomacromolecules | en_US |
| identifier.volume | 16 | en_US |
| identifier.issue | 5 | en_US |
| identifier.spage | 1660 | en_US |
| identifier.epage | 1666 | en_US |
| relation.doi | 10.1021/acs.biomac.5b00293 | en_US |
| rights.textversion | author | en_US |
| language.iso639-2 | eng | en_US |
| 出現コレクション: | c10-1. 雑誌掲載論文 (Journal Articles)
|
このアイテムのファイル:
| ファイル |
記述 |
サイズ | 形式 |
|---|
| 1923.pdf | | 2262Kb | Adobe PDF | 見る/開く |
|
当システムに保管されているアイテムはすべて著作権により保護されています。
|
