Experimental and numerical analyses of molecular vibrations in amorphous and crystalline polylactide at terahertz frequencies

N. Fuse, R. Sato, K. Itoh, Y. Ohki, M. Mizuno, K. Fukunaga

研究成果: Conference contribution

1 引用 (Scopus)

抜粋

Terahertz spectra were obtained for polylactide, and analyzed by numerical calculations based on the density functional theory. An absorption band was observed at around 50 cm-1, which becomes larger when the THz electric field is parallel to the sample drawing direction. An absorption peak with a similar directional dependence appears at around 40 cm-1 in the simulation, which is due to normal-mode molecular vibrations parallel to the molecular helix. Since the 50-cm-1 absorption decreases with an increase in crystallinity and the permittivity shows a step-like downward change, the molecular vibrations responsible for the 50 cm-1 band seems to be subjected to strong damping in amorphous regions. On the other hand, another absorption peak at 65 cm-1 with a positive dependence on the sample's crystallinity is likely to be due to some lattice vibration, since it does not appear in the calculations that only deal with intramolecular vibration.

元の言語English
ホスト出版物のタイトルProceedings of the 2010 IEEE International Conference on Solid Dielectrics, ICSD 2010
DOI
出版物ステータスPublished - 2010 10 25
イベント2010 IEEE International Conference on Solid Dielectrics, ICSD 2010 - Potsdam, Germany
継続期間: 2010 7 42010 7 9

出版物シリーズ

名前Proceedings of the 2010 IEEE International Conference on Solid Dielectrics, ICSD 2010

Other

Other2010 IEEE International Conference on Solid Dielectrics, ICSD 2010
Germany
Potsdam
期間10/7/410/7/9

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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  • これを引用

    Fuse, N., Sato, R., Itoh, K., Ohki, Y., Mizuno, M., & Fukunaga, K. (2010). Experimental and numerical analyses of molecular vibrations in amorphous and crystalline polylactide at terahertz frequencies. : Proceedings of the 2010 IEEE International Conference on Solid Dielectrics, ICSD 2010 [5568145] (Proceedings of the 2010 IEEE International Conference on Solid Dielectrics, ICSD 2010). https://doi.org/10.1109/ICSD.2010.5568145