Terahertz spectroscopy of hydrogen-bonded glass-forming liquids

Author

Sibik, Juraj ; Zeitler, J. Axel

Author_Institution

Dept. of Chem. Eng. & Biotechnol., Univ. of Cambridge, Cambridge, UK

fYear

2013

fDate

1-6 Sept. 2013

Firstpage

1

Lastpage

3

Abstract

We have measured the temperature dependent changes in the terahertz spectra of three different amorphous polyols: sorbitol, glycerol and xylitol. As samples of each material are heated from temperatures well below its glass transition temperature, T_g, to temperatures close to its melting point a clear change in absorption coefficient at T_g is observed in all three samples. In addition, the spectra of sorbitol and xylitol both reveal a marked change in absorption coefficient at temperatures of 0.6 T_g. This change indicates a change in molecular mobility that we attribute to a secondary relaxation process.

Keywords

absorption coefficients; glass transition; hydrogen bonds; melting point; polymers; terahertz wave spectra; vitrification; absorption coefficient; amorphous polyols; glass transition temperature; glycerol; hydrogen-bonded glass-forming liquids; melting point; molecular mobility; secondary relaxation process; sorbitol; temperature dependent changes; terahertz spectra; terahertz spectroscopy; xylitol; Absorption; Cooling; Dielectrics; Glass; Refractive index; Spectroscopy; Temperature measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2013 38th International Conference on

Conference_Location

Mainz

Type

conf

DOI

10.1109/IRMMW-THz.2013.6665881

Filename

6665881