聚合物玻璃化转变太赫兹光谱技术研究进展  

Progress on Terahertz Spectroscopy Detection of Glass Transition of Polymers

作　　者：柯智林 董冰 凌东雄 魏东山 KE Zhi-lin;DONG Bing;LING Dong-xiong;WEI Dong-shan(School of Mechanical Engineering,Dongguan University of Technology,Dongguan 523808,China;School of Electrical Engineering and Intelligentization,Dongguan University of Technology,Dongguan 523808,China;Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen 528055,China)

机构地区：[1]东莞理工学院机械工程学院,广东东莞523808 [2]东莞理工学院电子工程与智能化学院,广东东莞523808 [3]中国科学院深圳先进技术研究院,广东深圳528055

出　　处：《光谱学与光谱分析》2024年第10期2709-2716,共8页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(61771138);广东省基础与应用基础研究基金培育项目(2021B1515140018)资助。

摘　　要：聚合物玻璃化转变作为非晶聚合物的玻璃态和高弹态之间的转变,对材料性能尤其是力学性能具有重要影响。太赫兹光谱作为一种新型的光谱分析技术,具有非接触、快速和高灵敏度等优势,在聚合物玻璃化转变研究中显示出重要的应用潜力。通过对近15年来文献中的研究结果进行总结和分析,旨在全面了解太赫兹光谱技术在该领域的应用现状,并展望其未来发展方向。首先介绍了聚合物玻璃化转变的特性,探讨了传统的测量方法以及它们所面临的限制,如热分析法、动态机械分析法和红外光谱法等。为了弥补这些局限性,研究者们开始寻找新的研究手段。太赫兹光谱技术具有同时提供光谱和相位信息的能力,可以直接测量材料的折射率和介电常数,而折射率的变化可以反映聚合物链的自由体积变化,这是太赫兹光谱可以探测聚合物玻璃化转变的根本原因。接着,总结了近年来太赫兹光谱技术在聚合物玻璃化转变研究中的应用进展,对不同聚合物材料的研究结果进行了详细阐述,包括聚甲醛、聚酰胺、聚ε-己内酯、聚乳酸。研究结果表明,太赫兹光谱技术可以精确测定聚合物的玻璃化转变温度,并提供聚合物结构和构象的微观信息,揭示聚合物玻璃化转变机制。进一步,还指出了太赫兹光谱技术存在的问题,包括太赫兹光谱仪的频宽限制和高成本。因此,未来研究需要进一步改进太赫兹源和仪器的性能,开发更有效的数据分析方法,并探索太赫兹光谱技术在工业应用中的潜力。总体而言,太赫兹光谱技术作为一种新兴的研究工具,在聚合物玻璃化转变领域取得了积极的进展,并具备实现聚合物的快速、灵敏检测以及精确结构分析的能力。The polymer glass transition,as a transition between the glassy and highly elastic states of amorphous polymers,has an important impact on material properties,especially mechanical properties.Terahertz spectroscopy,as a novel spectroscopic analysis technique with the advantages of non-contact,rapidity,and high sensitivity,shows important potential for application in polymer glass transition studies.By summarizing and analyzing the findings in the literature in the last 15 years,this paper aims to provide a comprehensive understanding of the current status of the application of terahertz spectroscopy in this field and to look forward to its future development.Firstly,the properties of the polymer glass transition are introduced,and traditional measurement methods and the limitations they face,such as thermal analysis,dynamic mechanical analysis,and infrared spectroscopy,are explored.Researchers have begun to look for new study methods to compensate for these limitations.Terahertz spectroscopy can provide both spectral and phase information,allowing direct measurement of refractive index and dielectric constant and reflecting the free volume change of the polymer chain,which is why the THz spectroscopy can detect the glass transition of polymers.Subsequently,the progress in applying terahertz spectroscopy in studying polymer glass transition in recent years is summarized.Results of these studies show that terahertz spectroscopy can accurately determine the glass transition temperatures,provide microscopic information about the structure and conformation,and reveal the glass transition mechanism and dynamics behavior of polymers,including poly formaldehyde,polyamide,poly(ε-caprolactone),and polylactic acid.Moreover,this paper points out the existing problems of terahertz spectroscopy,including the bandwidth limitations and high cost of terahertz spectrometers.Therefore,future research needs further to improve the performance of terahertz sources and instruments,develop more efficient data analysis methods,and explo

关 键 词：太赫兹光谱 聚合物 玻璃化温度 吸收系数 折射率 

分 类 号：O657.61[理学—分析化学]