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Terahertz absorption spectra of poly(3-hydroxybutylate) (PHB) and nylon were measured by a terahertz time domain spectrometer and a Fourier transform far-infrared spectrometer. Clear differences were observed between the spectra of crystalline and amorphous PHB, indicating that the absorption peaks observed in the THz spectra originated in the higher-order conformation of PHB. Direction of the vibrational...
This paper reviews our recent spectroscopic study on poly(3-hydroxybutyrate) (PHB) for the terahertz (THz) frequency region. Clear differences are observed between the absorption spectra of crystalline and amorphous PHB, indicating that the higher order conformation of PHB determines the THz spectra. The THz polarization spectra are measured for a stretched PHB sample and the directions of the vibrational...
Isothermal crystallization of poly(3-hydroxy-butyrate) was studied by terahertz time-domain spectroscopy. The temporal change of the ratio between the crystalline and amorphous structure was estimated by the integrated absorption intensity. The crystallization process was discussed by using Avrmi's equation.
Isothermal crystallization of poly(3-hydroxybutylate) was observed by the temporal change of terahertz absorption spectra. The obtained spectra were analyzed by using two-dimensional correlation spectroscopy. Synchronous and asynchronous plots show the correlation of the absorption peaks and the order of the spectral change, which helps to understand the crystallization process.
Terahertz (THz) absorption spectra of poly(3-hydroxyalkanotes) (PHA) were measured by a terahertz timedomain spectrometer and Fourier transform far-infrared spectrometer. Clear differences were observed between the spectra of crystalline and amorphous PHA, indicating that the absorption peaks observed in the THz spectra originated in the higher-order conformation of PHA. Direction of the vibrational...
Far-ultraviolet (FUV) spectroscopy combined with attenuated total reflection (ATR) is employed for direct measurement of the concentrations of semiconductor wafer cleaning fluids such as SC-1 and SC-2. FUV absorption spectra of these aqueous solutions in the 170 – 200 nm region are highly sensitive to changes in both hydrogen bonding and hydration. We adopt quartz as an internal reflection element...
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