Browse > Article
http://dx.doi.org/10.7234/composres.2017.30.6.350

Development of Highly Thermal Conductive Liquid Crystalline Epoxy Resins Bearing Phenylcyclohexyl Mesogenic Moieties  

Jeong, Iseul (Carbon Composite Materials Research Center, Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST))
Kim, Youngsu (Carbon Composite Materials Research Center, Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST))
Goh, Munju (Carbon Composite Materials Research Center, Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST))
Publication Information
Composites Research / v.30, no.6, 2017 , pp. 350-355 More about this Journal
Abstract
The new liquid crystalline (LC) epoxy was designed by substituting the phenylcyclohexyl (PCH) mesogen moiety with an alkyl chain at the 2,5 position of the diglycidyl terephthalate. The mesomorphic properties were evaluated by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). All LC epoxy derivatives exhibited an enantiotropic smectic phase upon heating and cooling process. The LC phase temperature range was widened by mixing the eutectic mixture of LC epoxies. Interestingly, the cured LC epoxy exhibited the highest thermal conductivity of $0.4W{\cdot}m^{-1}{\cdot}K^{-1}$. The novel LC epoxy with high thermal conductivity might be used as a composite material for electronic and display devices.
Keywords
Liquid crystalline epoxy; Synthesis; Thermal conductivity; composite material;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 (International Journal) Yu, J., Jung, J., Choi, Y., Choi, J., Yu, J., Lee, J., You, N., and Goh, M., "Enhancement of the Crosslink Density, Glass Transition Temperature, and Strength of Epoxy Resin by Using Functionalized Graphene Oxide Co-curing Agents," Polymer Chemistry, Vol. 7, No. 1, 2016, pp. 36-43.   DOI
2 (International Journal) Choi, J.H., Song, H.J., Jung, J., Yu, J.W., You, N., and Goh, M., "Effect of Crosslink Density on Thermal Conductivity of Epoxy/carbon Nanotube Nanocomposites," Journal of Applied Polymer Science, Vol. 134, No. 4, 2017, 44253(pp. 1-7).
3 (International Journal) Gao, J., Huo, L., and Du, Y., "Nonisothermal Cure Kinetics and Diffusion Effect of Liquid-crystalline Epoxy Sulfonyl bis(1,4-phenylene)bis[4-(2,3-epoxypropyloxy) benzoate] Resin with Aromatic Diamine," Journal of Applied Polymer Science, Vol. 125, No. 5, 2012, pp. 3329-3334.   DOI
4 (International Journal) Hansen, D., and Bernier, G.A., "Thermal Conductivity of Polyethylene: The Effects of Crystal Size, Density and Orientation on the Thermal Conductivity," Polymer Engineering and Science, Vol. 12, No. 3, 1972, pp. 204-208.   DOI
5 (International Journal) Akatsuka, M., and Takezawa, Y., "Study of High Thermal Conductive Epoxy Resins Containing Controlled High-order Structures," Journal of Applied Polymer Science, Vol. 89, No. 9, 2003, pp. 2464-2467.   DOI
6 (International Journal) Cao, B.Y., Li, Y.W., Koing, J., Chen, H., Xu, Y., Yung, K.L., and Cai, A., "High Thermal Conductivity of Polyethylene Nanowire Arrays Fabricated by an Improved Nanoporous Template Wetting Technique," Polymer, Vol. 52, No. 8, 2011, pp. 1711-1715.   DOI
7 (International Journal) Mallon, J.J., and Adams, P.M., "Synthesis and Characterization of Novel Epoxy Monomers and Liquid Crystal Thermosets," Journal of Polymer Science: Part A: Polymer Chemistry, Vol. 31, 1993, pp. 2249-2260.   DOI
8 (International Journal) Kim, G., Lee, D., Shanker, A., Shao, L., Kwon, M.S., Gidley, D., Kim, J., and Pipe, K.P., "High Thermal Conductivity in Amorphous Polymer Blends by Engineered Interchain Interactions," Nature Materials, Vol. 14, 2014, pp. 295-300.
9 (International Journal) Kim, Y., Yeo, H., You, N.H., Jang, S.G., Ahn, S., Jeong, K.U., Lee, S.H., and Goh, M., "Highly Thermal Conductive Resins Formed from Wide-temperature-range Eutectic Mixtures of Liquid Crystalline Epoxies Bearing Diglycidyl Moieties at the Side Positions," Polymer Chemistry, Vol. 8, 2017, pp. 2806-2814.   DOI
10 (International Journal) Chien, L.C., Lin, C., Fredley, S., and McCargar, J.W., "Side-chain Liquid-crystal Epoxy Polymer Binders for Polymer-dispersed Liquid Crystals," Macromolecules, Vol. 25, 1992, pp. 133-137.   DOI
11 (International Journal) Ortiz, C., Kim, R., Rodighiero, E., Ober, C.K., and Kramer, E.J., "Deformation of a Polydomain, Liquid Crystalline Epoxy-Based Thermoset," Macromolecules, Vol. 31, 1998, pp. 4074-4088.   DOI
12 (International Journal) Lee, J.Y., Jang, J., Hong, S.M., Hwang, S.S., and Kim, K.U., "Relationship between the Structure of the Bridging Group and Curing of Liquid Crystalline Epoxy Resins," Polymer, Vol. 40, 1999, pp. 3197-3202.   DOI
13 (International Journal) Harada, M., Hamaura, N., Ochi, M., and Agari, Y., "Thermal Conductivity of Liquid Crystalline Epoxy/BN filler Composites having Ordered Network Structure," Composites: Part B, Vol. 55, 2013, pp. 306-313.   DOI
14 (International Journal) Harada, M., Ochi, M., Tobita, M., Kimura, T., Ishigaki, T., Shimoyama, N., and Aoki, H., "Thermal-conductivity Properties of Liquid-crystalline Epoxy Resin Cured under a Magnetic Field," Journal of Polymer Science: Part B: Polymer Physics, Vol. 41, 2003, pp. 1739-1743.   DOI
15 (International Journal) Li, Y., Badrinarayanan, P., and Kessler, M.R., "Liquid Crystalline Epoxy Resin Based on Biphenyl Mesogen: Thermal Characterization," Polymer, Vol. 54, No. 12, 2013, pp. 3017-3025.   DOI
16 (International Journal) Li, Y., and Kessler, M.R., "Liquid Crystalline Epoxy Resin Based on Biphenyl Mesogen: Effect of Magnetic Field Orientation during Cure," Polymer, Vol. 54, No. 21, 2013, pp. 5741-5746.   DOI
17 (Book) Stauffer, D., and Aharony, A., Introduction to Percolation Theory: Revised Second Edition, Taylor & Francis, UK, 1994.
18 (Korean Journal) Kim, Y., Jung, J., Yeo, H., You, N.H., Ahn, S., Lee, S.H., and Goh, M., "Development of Highly Thermal Conductivity Liquid Crystalline Epoxy Resins for High Thermal Dissipation Composites," Composites Research, Vol. 30, No. 1, 2017, pp. 1-6.   DOI
19 (Book) Pilato, L.A., and Michno, M.J., Advanced Composite Material, Springer Science & Business Media, Germany, 1994.