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环氧树脂胶的太赫兹光谱特性研究
引用本文:张瑾,崔洪亮,施长城,陈建冬,张紫茵,韩晓惠,马宇婷.环氧树脂胶的太赫兹光谱特性研究[J].光谱学与光谱分析,2016,36(4):919-923.
作者姓名:张瑾  崔洪亮  施长城  陈建冬  张紫茵  韩晓惠  马宇婷
作者单位:1. 吉林大学仪器科学与电气工程学院,吉林 长春 130061
2. 中国科学院重庆绿色智能技术研究院太赫兹技术研究中心,跨尺度制造技术重庆市重点实验室,重庆 400714
基金项目:国家(973)项目(2015CB755401),重庆市应用开发重大基金项目(cstc2013yykfC00007),重庆市科委基础研究计划重大项目(cstc2013jcyjC00001),国家自然科学基金项目(11404130)
摘    要:环氧树脂是纤维增强复合材料加工中的一种重要的胶粘剂,太赫兹时域光谱技术已成为纤维增强复合材料无损检测的有力补充手段。固化温度是环氧树脂的重要参数之一,不同的固化温度会影响环氧树脂胶的性能,因此采用太赫兹时域光谱技术分别对室温和高温下固化的环氧树脂胶的太赫兹透射光谱特性进行了系统研究,计算得到了不同温度下固化的环氧树脂胶的折射率和吸收系数,并进行了对比分析。研究表明,由于室温下固化的环氧树脂样本基本没有气泡,而高温下固化的样本存在微量气泡,气泡的存在降低了样品的密度,因此室温下固化的环氧树脂胶样品的折射率和吸收系数均大于高温下固化的样品。在同种固化条件下制备的不同样品间折射率差别较小,同时,室温下固化不同样品间的吸收系数差别亦较小,但高温下固化样品间的吸收系数在0.6~1.5 THz差别逐渐变大,这主要是因为高温下制备的不同样本间的气泡分布不均匀,即密度分布存在差异。室温和高温下固化样品的吸收系数在整体上均随着频率的增加而增加,并且没有明显的吸收峰。此外,由于法布里-珀罗干涉效应的存在,导致有些厚环氧树脂样本的能量透过率在共振峰处要远大于薄样本。该研究对纤维增强复合材料的太赫兹无损检测具有重要的研究意义。

关 键 词:太赫兹时域光谱  环氧树脂  折射率  吸收系数  法布里-珀罗干涉    
收稿时间:2015-10-12

Terahertz Spectroscopic Study on the Property of Epoxy Resin Adhesive
ZHANG Jin,CUI Hong-liang,SHI Chang-cheng,CHEN Jian-dong,ZHANG Zi-yin,HAN Xiao-hui,MA Yu-ting.Terahertz Spectroscopic Study on the Property of Epoxy Resin Adhesive[J].Spectroscopy and Spectral Analysis,2016,36(4):919-923.
Authors:ZHANG Jin  CUI Hong-liang  SHI Chang-cheng  CHEN Jian-dong  ZHANG Zi-yin  HAN Xiao-hui  MA Yu-ting
Institution:1. Jilin University, College of Instrumentation & Electrical Engineering, Changchun 130061, China2. 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
Abstract:Epoxy resin is an important adhesive applied in the manufacturing processes of fiber reinforced polymer (FRP) com‐posites .Terahertz (T Hz) 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 exper‐iments ,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 refrac‐tive index of different samples cured under the same condition is not significant .In addition ,the difference of absorption coeffi‐cient of different samples cured under room temperature is also slight .However ,the difference of absorption coefficient of differ‐ent 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 obvi‐ous 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 .
Keywords:Terahertz time-domain spectroscopy  Epoxy resin  Refractive index  Absorption coefficient  Fabry-Pérot interfer-ence
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