Analytical Sciences

Abstract − Analytical Sciences, 33(9), 1071 (2017).

Study on the Glass Transition Process of Polymer System Using Differential Scanning Calorimetry and Fourier Transform Infrared Spectroscopy
Yong-jin PENG,* Yu-ling LIU,* Qiang WU,** and Ping-chuan SUN**
*Teaching and Research Section of Physics, College of Comprehensive Studies, Jinzhou Medical University, Jinzhou 121001, P. R. China
**College of Chemistry, Nankai University, Tianjin 300071, P. R. China
The change in the infrared spectrum of polymer samples with temperature and their differential scanning calorimetry (DSC) experimental results are analyzed. According to the van’t Hoff equation at constant pressure, the changes in the absorbance ratio corresponding to high and low vibrational states are calculated, and the apparent enthalpy differences of the vibration energy states transformation of the characteristic group can be obtained. From the experimental results, we can find that characteristic vibration modes of a chemical group in a polymer are under the influence of the glass transition process of the polymer with a different extent. The characteristic vibration modes of the same chemical group behave differently due to the influence of the polymer system at which the chemical moiety is situated.