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THz-TDS spectra study of polymer materials with different polarity
Chen Xi-Liang; Chen Xin; Zhu Zhi-Yong
2013
Source PublicationJOURNAL OF INFRARED AND MILLIMETER WAVES
ISSN1001-9014
Volume32Issue:2Pages:150
AbstractTo 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 (alpha), imaginary part of dielectric constant (epsilon '') and relaxation strength (Delta epsilon). 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 (epsilon') was decreased with the increase of frequency. The relaxation time (tau) obtained from Debye fitting was also found to increase significantly with the dipole size and the rigidity of molecular.
Indexed BySCI
Language英语
Funding Project应物所项目组
WOS IDWOS:000318460400012
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/13972
Collection中科院上海应用物理研究所2011-2020年
Recommended Citation
GB/T 7714
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.
APA Chen Xi-Liang,Chen Xin,&Zhu Zhi-Yong.(2013).THz-TDS spectra study of polymer materials with different polarity.JOURNAL OF INFRARED AND MILLIMETER WAVES,32(2),150.
MLA Chen Xi-Liang,et al."THz-TDS spectra study of polymer materials with different polarity".JOURNAL OF INFRARED AND MILLIMETER WAVES 32.2(2013):150.
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