Terahertz spectral change associated with glass transition of poly-ε-caprolactone

Marina Komatsu, Maya Mizuno, Shingo Saito, Kaori Fukunaga, Yoshimichi Ohki

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20 Citations (Scopus)


We measured absorption spectra of unidirectionally stretched poly-ε-caprolactone (PCL) film in a range from 0.3 to 3.6 THz at temperatures from 10 to 300 K. Several absorption peaks were observed, when the electric field of THz waves was set in directions parallel and perpendicular to the stretching direction. The absorption bandwidths became significantly broad at around 200 K and above at least in two specific peaks. This temperature is close to the glass transition temperature of PCL. Further, it is shown by quantum chemical calculations that all the peaks obtained experimentally originate in skeletal vibrations of PCL. Therefore, it has become clear that a specific feature appears in the THz absorption spectrum of PCL associated with its glass transition.

Original languageEnglish
Article number133102
JournalJournal of Applied Physics
Issue number13
Publication statusPublished - 2015 Apr 7

ASJC Scopus subject areas

  • General Physics and Astronomy


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