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Chemical Research in Chinese Universities

, Volume 34, Issue 2, pp 326–332 | Cite as

Oligo-fluoropolymer Modified Cycloaliphatic Epoxy Resins with Excellent Compatibility, Waterproof and Mechanical Properties for LED Encapsulation

  • Yang Sun
  • Weiqu Liu
  • Zhengfang Wang
  • Jianquan Tan
Article
  • 28 Downloads

Abstract

An oligo-fluoropolymer(PFM) with functional cycloaliphatic epoxy and fluorinated groups was obtained via free radical polymerization and applied to the modification of cycloaliphatic epoxy resins(CE). The chemical structure of PFM was characterized by Fourier transform infrared(FTIR) spectroscopy, gel permeation chromatogra-phy(GPC) and nuclear magnetic resonance(NMR) spectroscopy, and the effects of different PFM concentra-tions(0.5%—6%, mass fraction) on the thermal resistance, mechanical properties, surface dewettability, light trans-mission, refractive index and various cured polymer properties were studied in detail. The DSC and TGA results demonstrate that the modified epoxy resins possess a higher thermal resistance than the neat epoxy resin. The im-provements in the surface dewettability and water resistance are caused by the high crosslinking density and the enrichment of the oligo-fluorinated random copolymers dispersed in the matrix. The fracture surface morphologies of the thermosets were investigated by scanning electron microscopy(SEM) and transmission electron microsco-py(TEM). It was observed that the optical transmittance of the composites was maintained even though microphase separation occurred during the curing process. With respect to the corresponding properties of the neat epoxy resins, the 2 phr(parts per hundreds of resin) PFM thermoset exhibited relatively better comprehensive properties, making the cured material a good candidate for light-emitting diode(LED) encapsulation.

Keywords

Oligo-fluoropolymer Epoxy resin Light-emitting diode Encapsulate 

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Copyright information

© Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Yang Sun
    • 1
    • 2
    • 3
  • Weiqu Liu
    • 1
    • 2
  • Zhengfang Wang
    • 1
    • 2
  • Jianquan Tan
    • 1
    • 2
    • 3
  1. 1.Guangzhou Institute of ChemistryChinese Academy of SciencesGuangzhouP. R. China
  2. 2.Key Laboratory of Cellulose and Lignocellulosics Chemistry of Chinese Academy of SciencesGuangzhouP. R. China
  3. 3.University of Chinese Academy of SciencesBeijingP. R. China

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