| 光谱学与光谱分析 |
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| Terahertz Spectroscopic Study on the Property of Epoxy Resin Adhesive |
| ZHANG Jin1, CUI Hong-liang1, 2*, SHI Chang-cheng2*, CHEN Jian-dong1, ZHANG Zi-yin1, HAN Xiao-hui1, MA Yu-ting1 |
1. Jilin University, College of Instrumentation & Electrical Engineering, Changchun 130061, China
2. Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Research Center for Terahertz Technology, Chongqing Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing 400714, China |
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Abstract Epoxy resin is an important adhesive applied in the manufacturing processes of fiber reinforced polymer (FRP) composites. Terahertz (THz) time-domain spectroscopy (TDS) technology is an effective supplementary method for nondestructive evaluation (NDE) of FRP composites. As one of the most important parameters for epoxy resin, different curing temperature can affect the properties of epoxy resin. In this paper, we carry out systematic investigations on THz transmission properties of epoxy resin cured respectively under room temperature and high temperature with THz TDS technology. At the same time, the authors extract the refractive indices and absorption coefficients of epoxy resin, and make comparisons d. As shown in the experiments, the epoxy resin samples cured under room temperature have no bubble, whereas there are some micro-bubbles in the samples cured under high temperature, which reduce the sample density. Hence, the refractive index and absorption coefficient of epoxy resin cured under room temperature are both greater than those cured under high temperature. The difference of refractive index of different samples cured under the same condition is not significant. In addition, the difference of absorption coefficient of different samples cured under room temperature is also slight. However, the difference of absorption coefficient of different samples cured under high temperature gradually increase within the frequency from 0.6 to 1.5 THz, which is mainly due to the heterogeneous distribution of the bubbles in the different samples cured under high temperature. Moreover, the absorption coefficient of epoxy resin prepared under both curing temperatures gradually increases with the frequency, and there is no obvious absorption peak. Finally, because of the existence of Fabry-Pérot interference, the power transmission ratio of thicker epoxy resin samples may be greater than thinner samples at the resonant frequency. This research is of great significance for the THz NDE of FRP composites.
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Received: 2015-10-12
Accepted: 2016-01-30
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Corresponding Authors:
CUI Hong-liang, SHI Chang-cheng
E-mail: hcui@jlu.edu.cn;ccshi@cigit.ac.cn
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