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不同极性聚合物材料的THz-TDS光谱测量研究

THz-TDS spectra study of polymer materials with different polarity

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摘要

为探讨聚合物分子的极性对其介电性质的影响, 采用太赫兹时域光谱研究了5种聚合物材料, 高密度聚乙烯、聚对苯二甲酸乙二醇酯、聚氨酯、聚偏氟乙烯和聚乙烯吡咯烷酮在太赫兹波段的吸收色散性质, 并尝试采用Debye模型对实验结果进行了理论分析.研究发现, 聚合物的偶极弛豫运动随极性的增强而加剧, 导致吸收系数(α)、介电常数虚部(ε")和弛豫强度(Δε)均随之增大; 由于弛豫运动受介质阻尼的影响落后于太赫兹电场的周期性变化, 折射率(n)和介电常数实部(ε')呈现反常的色散现象, 即n和ε'随频率的增大而降低; Debye模拟结果还表明弛豫时间(τ)随偶极子尺寸的增大和分子刚性的增强而显著增大.

Abstract

To exploring the effect of polarity on dielectric properties of polymers, the absorption and dispersion characteristics of 5 polymers (high density polyethylene (HDPE), polyethylene terephthalate (PET), polyurethane (PU), polyvinylpyrrolidone (PVP), polyvinylidene fluoride (PVDF)) in terahertz band were studied with terahertz time-domain spectroscopy (THz-TDS). Theoretical analysis was conducted by fitting the experimental results to Debye formula. It was demonstrated from the study that dipolar polarization occurred and was enhanced with the increase of the polymer polarity, which is responsible for the increment of absorption coefficient (α), imaginary part of dielectric constant (ε") and relaxation strength (Δε). It was known that the relaxation of dipole following behind the periodical variety of THz electric field was due to the medium damping effect. As a result, abnormal dispersion behavior happened. It was found that both the refractive index (n) and the real part of dielectric constant (ε')was decreased with the increase of frequency. The relaxation time (τ) obtained from Debye fitting was also found to increase significantly with the dipole size and the rigidity of molecular.

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中图分类号:O644

DOI:10.3724/sp.j.1010.2013.00150

基金项目:国家自然科学基金 (10675157, 10875161,21003037)

收稿日期:2012-03-18

修改稿日期:2012-10-22

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作者单位    点击查看

陈西良:黄河水利职业技术学院 应用化学研究中心, 河南 开封 475003中国科学院上海应用物理研究所, 上海 201800
陈欣:河南大学化学化工学院, 河南 开封 475003
朱智勇:中国科学院上海应用物理研究所, 上海 201800

联系人作者:陈西良(cxliang2006@163.com)

备注:陈西良(1981-), 男, 山东莱芜人, 博士, 主要从事复合材料的太赫兹光谱学研究.

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引用该论文

CHEN Xi-Liang,CHEN Xin,ZHU Zhi-Yong. THz-TDS spectra study of polymer materials with different polarity[J]. Journal of Infrared and Millimeter Waves, 2013, 32(2): 150-153

陈西良,陈欣,朱智勇. 不同极性聚合物材料的THz-TDS光谱测量研究[J]. 红外与毫米波学报, 2013, 32(2): 150-153

被引情况

【1】陈西良,朱智勇. 利用反向有效介质理论研究CB/HDPE复合导电体系太赫兹波段的介电性质. 红外与毫米波学报, 2014, 33(6): 629-634

【2】陈 涛,蔡治华,胡放荣,殷贤华,许川佩. 结构相似单糖和二糖分子的太赫兹时域光谱研究. 光谱学与光谱分析, 2019, 39(3): 686-692

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