Controlled Terahertz Birefringence in Stretched Poly(lactic acid) Films Investigated by Terahertz Time-Domain Spectroscopy and Wide-Angle X-ray Scattering

Hotsumi Iwasaki, Madoka Nakamura, Nozomu Komatsubara, Makoto Okano, Masayoshi Nakasako, Harumi Sato, Shinichi Watanabe

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We report a correlation between the dielectric property and structure of stretched poly(lactic acid) (PLA) films, revealed by polarization-sensitive terahertz time-domain spectroscopy and two-dimensional (2D) wide-angle X-ray scattering (WAXS). The experiments evidence that the dielectric function of the PLA film becomes more anisotropic with increasing draw ratio (DR). This behavior is explained by a classical Lorentz oscillator model assuming polarization-dependent absorption. The birefringence can be systematically altered from 0 to 0.13 by controlling DR. The combination of terahertz spectroscopy and 2D WAXS measurement reveals a clear correlation between the birefringence in the terahertz frequency domain and the degree of orientation of the PLA molecular chains. These findings imply that the birefringence is a result of the orientation of the PLA chains with anisotropic macromolecular vibration modes. Because of a good controllability of the birefringence, polymer-based materials will provide an attractive materials system for phase retarders in the terahertz frequency range.

Original languageEnglish
Pages (from-to)6951-6957
Number of pages7
JournalJournal of Physical Chemistry B
Volume121
Issue number28
DOIs
Publication statusPublished - 2017 Jul 20

Fingerprint

Birefringence
lactic acid
Lactic acid
X ray scattering
birefringence
Spectrum Analysis
X-Rays
Spectroscopy
scattering
spectroscopy
Terahertz Spectroscopy
x rays
Terahertz spectroscopy
Polarization
retarders
molecular chains
controllability
polarization
Vibration
Controllability

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Controlled Terahertz Birefringence in Stretched Poly(lactic acid) Films Investigated by Terahertz Time-Domain Spectroscopy and Wide-Angle X-ray Scattering. / Iwasaki, Hotsumi; Nakamura, Madoka; Komatsubara, Nozomu; Okano, Makoto; Nakasako, Masayoshi; Sato, Harumi; Watanabe, Shinichi.

In: Journal of Physical Chemistry B, Vol. 121, No. 28, 20.07.2017, p. 6951-6957.

Research output: Contribution to journalArticle

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