화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.30, 77-84, October, 2015
DOI10.1016/j.jiec.2015.05.004  Export Citation
Effect of backbone moiety in diglycidylether-terminated liquid crystalline epoxy on thermal conductivity of epoxy/alumina composite
Thanhkieu Giang, and Jinhwan Kim†
  • Department of Polymer Science and Engineering, Sungkyunkwan University, Suwon 440-746, Gyeonggi-do, South Korea
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Three diglycidylether-terminated liquid crystalline epoxy (LCE) structures based on azomethine mesogen, 4040-bis(4-hydroxybenzylidene)-diaminodiphenylether diglycidylether (LCE-DPE), 4040-bis(4-hydroxybenzylidene)-diaminophenylene diglycidylether (LCE-DP), and terephthalylidene-bis-(4-ami-nophenol) diglycidylether (LCE-TA) were synthesized in an attempt to investigate the effect of backbone moiety in epoxy on the thermal conductivity of LCE/alumina (Al2O3) 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, 4,40-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 (Tm), sharp crystalline melting at Tm, transitions into either nematic or smectic mesophase above Tm, and consequent isotropic phase above isotropic temperature (Ti). 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/Al2O3 composite is strongly dependent on the backbone structure of LCE and the more the ordering in LCE backbone the higher the thermal conductivity.
Keywords:Liquid crystalline epoxy;Alumina;Composite;Thermal conductivity;Mesophase
  1. Giang T, Part J, Cho I, Ko Y, Kim J, Polym. Compos., 34, 468 (2013)
  2. Castell P, Galia M, Serra A, Macromol. Chem. Phys., 202, 1649 (2001)
  3. Koscielny B, Pfitzmann A, Fedtke M, Polym. Bull., 32(5-6), 529 (1994)
  4. Ortiz C, Kim R, Rodighiero E, Ober CK, Kramer EJ, Macromolecules, 31(13), 4074 (1998)
  5. Ambrogi V, Carfagna C, Giamberini M, Amendola E, Douglas EP, J. Adhes. Sci. Technol., 16(1), 15 (2002)
  6. Mihara T, Nishimiya Y, Koide N, J. Appl. Polym. Sci., 68(12), 1979 (1998)
  7. Jang J, Bae J, Lee K, Polymer, 46(11), 3677 (2005)
  8. Cho S, Douglas EP, Lee JY, Polym. Eng. Sci., 46(5), 623 (2006)
  9. Bruggeman A, Damman SB, Tinnemans AH, J. Appl. Polym. Sci., 66(10), 1971 (1997)
  10. Sue HJ, Earls JD, Hefner RE, J. Mater. Sci., 32(15), 4031 (1997)
  11. Lin QH, Yee AF, Earls JD, Hefner RE, Sue HJ, Polymer, 35(12), 2679 (1994)
  12. Amendola E, Carfagna C, Giamberini M, Pisaniello G, Macromol. Chem. Phys., 196, 1577 (1995)
  13. Su WA, J. Polym. Sci. A: Polym. Chem., 31, 3251 (1993)
  14. LIN CL, CHIEN LC, Macromol. Rapid Commun., 16(11), 869 (1995)
  15. Mititelu A, Cascaval CN, Polym. Plast. Technol. Eng., 44, 151 (2005)
  16. Mallon JJ, Adams PM, J. Polym. Sci. A: Polym. Chem., 31, 2249 (1993)
  17. Carfagn C, Amendola E, Giamberini M, Macromol. Chem. Phys., 195, 2307 (1994)
  18. Mititelu-Mija A, Cascaval CN, Navard P, Des. Monomers Polym., 8, 487 (2005)
  19. Yu YF, Wang MH, Liu XY, Zhao L, Tang XL, Li SJ, J. Appl. Polym. Sci., 101(6), 4366 (2006)
  20. Zheng Y, Ren S, Ling Y, Lu M, Mol. Cryst. Liq. Cryst., 452, 3 (2006)
  21. Lee JY, Jang JS, Polymer, 47(9), 3036 (2006)
  22. Gao J, Hou G, Wang Y, Li H, Liu Y, Polym. Plast. Technol. Eng., 45, 947 (2006)
  23. Cai ZQ, Sun JZ, Zhou QY, Xu JL, J. Polym. Sci. A: Polym. Chem., 45(5), 727 (2007)
  24. Cai ZQ, Sun JZ, Wang DD, Zhou QY, J. Polym. Sci. A: Polym. Chem., 45(17), 3922 (2007)
  25. Pottie L, Costa-Torroa F, Tessier M, Davidson P, Fradet A, Liq. Cryst., 35, 913 (2008)
  26. Gao ZY, Yu YF, Xu YZ, Li SJ, J. Appl. Polym. Sci., 105(4), 1861 (2007)
  27. Ochi M, Takashima H, Polymer, 42(6), 2379 (2001)
  28. Mija A, Navard P, Peiti C, Babor D, Guigo N, Eur. Polym. J., 46, 1380 (2010)
  29. Choi EJ, Ahn HK, Lee JK, Jin JI, Polymer, 41(21), 7617 (2000)
  30. Ribera D, Mantecon A, Serra A, Macromol. Chem. Phys., 202, 1658 (2001)
  31. Fukushima K, Takahashi H, Takezawal Y, Hattori M, Itoh M, Yonekura M, Electrical Insulation and Dielectric Phenomena, 2004. CEIDP ‘04. 2004 Annual Report Conference on, Colorado City, AZ, (2004), p. 340.
  32. Akatsuka M, Takezawa Y, J. Appl. Polym. Sci., 89(9), 2464 (2003)
  33. Tokushige N, Mihara T, Koide N, Mol. Cryst. Liq. Cryst., 428, 33 (2005)
  34. Harada M, Ochi M, Tobita M, Kimura T, Isgigaki T, Shimoyama N, Aoki H, J. Polym. Sci. A: Polym. Chem., 41, 1739 (2003)
  35. Garcia FG, Soares BG, Polym. Test, 22, 51 (2003)
  36. Garea SA, Corbu AC, Deleanu C, Iovu H, Polym. Test, 25, 107 (2006)
  37. Mormann W, Brocher M, Polymer, 40, 193 (1998)
  38. Mormann W, Brocher M, Macromol. Chem. Phys., 199, 853 (1998)
  39. Chapman NB, Isaacs NS, Parker RE, J. Chem. Soc., 1925 (1959)
  40. Ros D, Mititelu A, Cascaval CN, Polym. Test, 23, 209 (2004)
  41. Kim JH, Yu HY, Lee JY, Kim SW, J. Ind. Eng. Chem., 8(1), 34 (2002)
  42. Bahadur B, Liquid Crystals-Application and Uses, vol. 1, World Scientific, Ontario, 1990, pp. 1-87.
  43. Barklay GG, Ober CK, Papathomas KI, Wang DW, Macromolecules, 25, 2947 (1992)
  44. Krevelen V, Properties of Polymers, third ed., Elsevier, New York, NY, 1990p. p525.
  45. Majumdar A, Handbook of Heat Transfer, third ed., McGraw-Hill, New York, NY, 1998p. 8.1.
  46. Nielsen LE, Ind. Eng. Chem. Fundam., 13, 17 (1974)
  47. Pal R, Compos. Pt. A-Appl. Sci. Manuf., 39, 718 (2008)
  48. Agari Y, J. Appl. Polym. Sci., 49, 1625 (1993)
  49. Agari Y, Uno T, J. Appl. Polym. Sci., 30, 2225 (1985)
  50. Mark JE, Physical Properties of Polymer Handbook, second ed., Springer, New York, NY, 2007p. 155.
  51. Tobia M, Kimura T, Ishigaki T, Shimoyama N, Aoki H, Ochi M, Harada M, U.S. Patent, 0224163 A1 (2004).