Real-Time Monitoring of Structural Changes in Poly(lactic acid) during Thermal Treatment by High-Speed Terahertz Time-Domain Spectroscopy for Nondestructive Inspection

Madoka Nakamura, Makoto Okano, Shinichi Watanabe

研究成果: Article査読

2 被引用数 (Scopus)

抄録

Thermally induced structural changes in polymeric materials are usually accompanied by a change of vital properties such as mechanical stability. We demonstrate an emerging technique for real-time monitoring of thermally induced structural changes of poly(lactic acid) (PLA). The technique is based on terahertz time-domain spectroscopy (THz-TDS) because spectra of the dielectric function of PLA in the terahertz frequency range reflect macroscopic molecular vibration modes which are strongly linked to the PLA morphology and structure. By comparison with conventional X-ray diffraction data, we confirm a strong correlation between the polymer structure and the spectra of the dielectric function. We achieve real-time monitoring of two essential thermally induced structural changes: the cold crystallization process from amorphous phase to the crystalline α-phase and the glass transition process. The proposed technique is useful for understanding the structural changes in polymeric materials induced by thermal treatments and holds promise for nondestructive inspection of polymeric products in a contactless manner.

本文言語English
ページ(範囲)3008-3016
ページ数9
ジャーナルACS Applied Polymer Materials
1
11
DOI
出版ステータスPublished - 2019 11月 8

ASJC Scopus subject areas

  • ポリマーおよびプラスチック
  • プロセス化学およびプロセス工学
  • 有機化学

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