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Synthesis and characterization of a high refractive diglycidyl ether of thiodibenzenethiol epoxy resin

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Abstract

High refractive index of epoxy resins used as encapsulant in light-emitting diode (LED) is essential in improving the light extraction efficiency, reducing heat and prolonging the service life of LED packages. In this study, diglycidyl ether of thiodibenzenethiol (DGETDBT), an epoxy resin with high refractive index, was synthesized via a novel method and its chemical structure was characterized with Fourier-transform infrared (FTIR) spectrometer and 1H NMR spectrometer. Using m-xylylenediamine (MXDA) as curing agent, the curing behavior of DGETDBT was studied by differential scanning calorimetry (DSC) and was compared with that of diglycidyl ether of bisphenol A (DGEBA), a generally used encapsulant in LED. The thermal behavior and optical performance of these two resins were investigated with thermogravimetric analyses, UV–Vis scanning spectrophotometer, and Abbe refractometer, respectively. The results showed that DGETDBT/MXDA resin demonstrated similar curing and thermal behavior to DGEBA/MXDA resin. But its refractive index reaches 1.698, which is significantly higher than that of DGEBA/MXDA resin (1.604). Comparatively, DGETDBT resin can be expected to be a more effective encapsulant of LED.

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Acknowledgments

The authors are grateful to the support of the National Natural Science Foundation of China (No. 50903095), Natural Science Foundation of Guangdong Province, China (No. S2011010004450), the Opening Project of the Key Laboratory of Polymer Processing Engineering of Ministry of Education of China (No. 20111005), the Fundamental Research Funds for the Central Universities SCUT (Nos. 2011ZM0012, 2012ZB0005) and China Postdoctoral Science Foundation.

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Authors and Affiliations

  1. College of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, People’s Republic of China

    Chaoyun Luo, Jianqing Zhao, Yanchao Yuan & Ying Zhao

  2. School of Applied Chemistry and Biological Technology, Shenzhen Polytechnic, Shenzhen, 518055, People’s Republic of China

    Chaoyun Luo & Xuechun Lin

  3. The Key Laboratory of Polymer Processing Engineering of Ministry of Education, Guangzhou, 510640, People’s Republic of China

    Yanchao Yuan

  4. College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, People’s Republic of China

    Jiandong Zuo

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  1. Chaoyun Luo
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  2. Jianqing Zhao
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  5. Xuechun Lin
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Correspondence to Yanchao Yuan.

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Luo, C., Zhao, J., Yuan, Y. et al. Synthesis and characterization of a high refractive diglycidyl ether of thiodibenzenethiol epoxy resin. Polym. Bull. 69, 337–345 (2012). https://doi.org/10.1007/s00289-012-0734-x

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  • DOI: https://doi.org/10.1007/s00289-012-0734-x

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