Journal of Industrial and Engineering Chemistry

  • Volume 30
  • /
  • Pages.77-84
  • /
  • 2015
  • /
  • 1226-086X(pISSN)
  • /
  • 1876-794X(eISSN)
The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Effect of backbone moiety in diglycidylether-terminated liquid crystalline epoxy on thermal conductivity of epoxy/alumina composite

  • Giang, Thanhkieu (Department of Polymer Science and Engineering, Sungkyunkwan University) ;
  • Kim, Jinhwan (Department of Polymer Science and Engineering, Sungkyunkwan University)
  • Received : 2015.03.18
  • Accepted : 2015.05.05
  • Published : 2015.10.25
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Abstract

Three diglycidylether-terminated liquid crystalline epoxy (LCE) structures based on azomethine mesogen, 4'4'-bis(4-hydroxybenzylidene)-diaminodiphenylether diglycidylether (LCE-DPE), 4'4'-bis(4-hydroxybenzylidene)-diaminophenylene diglycidylether (LCE-DP), and terephthalylidene-bis-(4-aminophenol) diglycidylether (LCE-TA) were synthesized in an attempt to investigate the effect of backbone moiety in epoxy on the thermal conductivity of LCE/alumina ($Al_2O_3$) composite. The synthesized species were characterized by $^1H$-NMR, FT-IR, Difference scanning calorimetry (DSC), Thermogravimetric analysis (TGA), and Optical microscope (OM). The liquid crystalline properties of three LCE resins themselves and the epoxy systems cured with an identical curing agent, 4,4'-diaminodiphenylsulfone (DDS) were examined using DSC and OM. The results show that all three LCE resins exhibit typical liquid crystalline behaviors: clear solid crystalline state below its melting temperature ($T_m$), sharp crystalline melting at $T_m$, transitions into either nematic or smectic mesophase above $T_m$, and consequent isotropic phase above isotropic temperature ($T_i$). The thermal conductivity was measured by laser flash method and the results were compared with the theoretical model. Experimental data fit well with the well-known Agari-Uno's theoretical model. It was found that the thermal conductivity of $LCE/Al_2O_3$ composite is strongly dependent on the backbone structure of LCE and the more the ordering in LCE backbone the higher the thermal conductivity.

Keywords

Acknowledgement

Supported by : Ministry of Trade, Industry and Energy, Ministry of Science, ICT & Future Planning

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