研究目的
To investigate the isothermal crystallization of poly(glycolic acid) (PGA) using terahertz (THz) and infrared (IR) spectroscopy and simultaneous small-angle X-ray scattering (SAXS)/wide-angle X-ray diffraction (WAXD) measurements, focusing on changes in intermolecular interactions during the process.
研究成果
The study concluded that the crystallization of PGA is influenced by weak hydrogen bonding between molecular chains, with THz absorption peaks appearing after the formation of crystal lamellae. The temporal difference in the intensity of THz bands is due to the difference in vibrational origins, highlighting the sequence of structural formation during crystallization.
研究不足
The study's limitations include the non-simultaneous measurement of SAXS/WAXD and THz spectra, which may affect the alignment of the time axis between the two types of experiments.
1：Experimental Design and Method Selection:
The study employed THz and IR spectroscopy alongside simultaneous SAXS/WAXD measurements to monitor the isothermal crystallization of PGA.
2：Sample Selection and Data Sources:
PGA films were prepared for IR and THz measurements, and samples for SAXS/WAXD were prepared by hot pressing above its melting point followed by rapid cooling.
3：List of Experimental Equipment and Materials:
A Thermo Fisher Scientific Nicolet 6700 Fourier transform IR spectrometer, a JASCO FARIS FT-FIR spectrometer, and the FSBL03XU beamline at SPring-8 were used.
4：Experimental Procedures and Operational Workflow:
The isothermal crystallization process was monitored at 185°C, with THz spectra measured every 80 s and SAXS/WAXD patterns recorded every 6 s.
5：Data Analysis Methods:
Two-dimensional correlation spectroscopy (2D-COS) was used to analyze the temporal changes in the spectra and diffraction profiles.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
