Title :
Temperature sensitive absorption characteristics of polyamides
Author :
Krumbholz, N. ; Hochrein, T. ; Mittleman, D.M. ; Grunenberg, J. ; Schade, U. ; Koch, M.
Author_Institution :
Inst. fuer Hochfrequenztech., Tech. Univ. Braunschweig, Braunschweig, Germany
Abstract :
We investigate the temperature dependent absorption characteristics of polyamides (PA) in the terahertz frequency range. The absorption spectra can be explained by inter-molecular bonding mechanisms. Experimental data is obtained by terahertz time-domain spectroscopy (THzTDS) on injection-molded specimens as well as on molten polyamides at different temperatures. The THzTDS data is compared to FTIR measurements. Additionally, we present density functional theory simulations of PA66 that clarify the origin of the well-known absorption peaks located at approximately 3 THz and 9 THz, respectively.
Keywords :
Fourier transform spectra; absorption coefficients; density functional theory; infrared spectra; polymer melts; terahertz wave spectra; absorption coefficient; absorption spectra; density functional theory simulations; injection-molded specimens; intermolecular bonding mechanism; polyamides; temperature sensitive absorption; terahertz frequency range; terahertz time-domain spectroscopy; Bonding; Electromagnetic wave absorption; Frequency; Hydrogen; Polymers; Spectroscopy; Temperature dependence; Temperature distribution; Temperature measurement; Temperature sensors;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves, 2009. IRMMW-THz 2009. 34th International Conference on
Conference_Location :
Busan
Print_ISBN :
978-1-4244-5416-7
Electronic_ISBN :
978-1-4244-5417-4
DOI :
10.1109/ICIMW.2009.5324605
