液晶聚合物材料的红外光谱表征

FT-IR Characterization of Liquid Crystalline Polymers

红外光谱以高选择性、无破坏性以及高超的分辨和实时跟踪能力成为从分子水平研究液晶聚合物的重要分析手段,而偏振二向色技术、时间分辨步扫描技术和二维相关分析技术的发展进一步提高了红外光谱分析复杂液晶聚合物的能力。本文介绍了传统傅里叶变换红外光谱及各种新型光谱分析技术(主要是二维相关技术)对液晶聚合物材料表征的研究进展,特别是对于液晶聚合物分子氢键、共聚和共混物相容性以及外场(温度、电场、光场、应力场)作用下液晶分子取向等的研究,并分别进行了具体的应用实例分析。

Infrared spectroscopy （IR） is a well-established nondestructive method for highly selective identification and real-time tracing of LCPs chemical species. Additionally, the development of polarized IR, time-resolved IR and two-dimensional correlation IR gives more information about LCPs. In this review, current progress in characterization of LCPs by traditional FT-IR and novel spectra analysis technologies （mainly two-dimensional correlation analysis） is presented, especially in the investigation of hydrogen-bonds in LCPs, compatibility of liquid crystalline copolymers and blends, and orientation behaviors upon different perturbations （temperature, electric field, light, strain）. Concrete examples in each case are also presented here helping illustrate the applications of different infrared spectral analysis methods.