A method for monitoring of vibrational response and temperature region of glass transition by a single analysis is introduced with the use of an otherwise well-known spectroscopic method. The temperature-dependent changes of polystyrene (PS) thin films were investigated by polarization-modulated infrared reflection-absorption spectroscopy. The study revealed that changes in individual spectral regions with the temperature increase are specific and provide the relation to the processing and thermal history of the thin film. Temperature responses of infrared spectral region areas; an abrupt change of C_ar-H stretching, a step-like change of C_ar-H out-of-plane bending, a linear decrease of C–H stretching and C–H bending area, granted information on the temperature domain represented by local molecular motion change (β-transition) of PS. The different behavior of spectral regions is rationalized by consideration of vibrational free volume contribution to the total free volume of the system that is certainly influenced by functional groups nature, such as their size, geometry and involvement of non-bonding interaction.

介绍了一种通过单一分析监测振动响应和玻璃化转变温度区域的方法，使用其他众所周知的光谱方法。通过偏振调制红外反射吸收光谱研究了聚苯乙烯 (PS) 薄膜的温度依赖性变化。研究表明，随着温度升高，单个光谱区域的变化是特定的，并提供了与薄膜加工和热历史的关系。红外光谱区区域的温度响应；C的急剧变化_AR -H拉伸，C的台阶状变化_AR-H 面外弯曲，C-H 拉伸和 C-H 弯曲区域的线性减小，提供了由 PS 的局部分子运动变化（β-转变）表示的温度域的信息。光谱区域的不同行为通过考虑振动自由体积对系统总自由体积的贡献来合理化，该系统的总自由体积肯定受官能团性质的影响，例如它们的大小、几何形状和非键相互作用的参与。