Volume 4, Issue 6, December 2016, Page: 247-255
Synthesis and Properties of New Liquid Crystals as Curing Agents for Epoxy Resins
Anber M. Anber, Department of Chemistry, Faculty of Science, Damascus University, Damascus, Syrian Arab Republic
Sahar Al-Hariri, Department of Chemistry, Faculty of Science, Damascus University, Damascus, Syrian Arab Republic
Ayham H. Abazid, Department of Chemistry, Faculty of Science, Damascus University, Damascus, Syrian Arab Republic
Received: Dec. 4, 2016;       Accepted: Jan. 5, 2017;       Published: Jan. 20, 2017
DOI: 10.11648/j.ajac.20160406.15      View  4815      Downloads  180
A novel class liquid crystalline epoxy resins was synthesized by reacting the diglycidyl ether of bisphenol A (DGEBA) with three new liquid crystal diols, 4,4`-di-N-](6-hydroxy hexoxy)-3-pyridyl methylidene [amino phenyl benzamide, 4,4`- di-N-](6-hydroxy butoxy)-3-pyridyl methylidene[amino phenyl benzamide, and 4,4`- di-N-](6-hydroxy etoxy)-3-pyridyl methylidene[amino phenyl benzamide, contain azomethine groups. The new liquid crystals were characterized by Fourier transformed infra-red (FT-IR) and nuclear magnetic resonance (NMR) spectroscopy. Flexibility and adhesion properties were then investigated for the cured resins based on new azomethine mesogenic diols. The cured polymers were found to exhibit high flexibility and good adhesion properties compared to ordinary amine systems.
Epoxy Resin, Liquid Crystal, DGEBA, Schiff Base, Azomethine Mesogenic Diol, Synthesis, Characterization, Mechanical Properties
To cite this article
Anber M. Anber, Sahar Al-Hariri, Ayham H. Abazid, Synthesis and Properties of New Liquid Crystals as Curing Agents for Epoxy Resins, American Journal of Applied Chemistry. Vol. 4, No. 6, 2016, pp. 247-255. doi: 10.11648/j.ajac.20160406.15
Copyright © 2016 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
S. J. Hartman, The Epoxy Resin Formulators Training Manual, The Society of the Plastics Industry, Inc., New York, 1984; 9, 678-679.
Fan-Long Jin, Xiang Li, Soo-Jin Park, Synthesis and application of epoxy resins: A review, Journal of Industrial and Engineering Chemistry, 2015; 29, 1-11.
Pooja Sharma, Thermal behaviour of Diglycidyl ether of bisphenol-A (DGEBA)/dithiols bearing an azomethine group: International Journal of Chem Tech Research, Jan-Mar 2013; 5 (1), 85-91.
V. Ambrogi, M. Giamberini, P. Cerruti, P. Pucci, N. Menna, R. Mascolo, C. Carfagna, Liquid crystalline elastomers based on diglycidyl terminated rigid monomers and aliphatic acids. Part 1. Synthesis and characterization, Polymer, 2005; 46, 7, 2105-2121.
Yin-Ling Liu, Zhi-Qi Cai, X. Wen, P. Pi, D. Zheng, J. Cheng, Z. Yang, Thermal properties and cure kinetics of a liquid crystalline epoxy resin with biphenyl-aromatic ester mesogen, Thermochimica Acta, 513, 2011; 1–2, 88-93.
C. Farren, M. Akatsuka, Y. Takezawa, Y. Itoh, Thermal and mechanical properties of liquid crystalline epoxy resins as a function of mesogen concentration: Polymer, 2001, 42, 1507.
C. Carfagna, E. Amendola, M. Giamberini, Liquid crystalline epoxy resins containing binaphthyl group as rigid block with enhanced thermal stability: Macromolecular Chemistry and Physics, 1994; 195, 2307.
K. Sadagopan, D. Ratna, A. B. J. Samui, Synthesis and characterization of liquid-crystalline epoxy and its blend with conventional epoxy: Journal of Polymer Science Part A, 2003, 41, 3375.
J. Y. Lee, S. S. Hong, K. U. Kim, Relationship between the structure of the bridging group and curing of liquid crystalline epoxy resins: Polymer, 1999, 40, 3197-3202.
E. J. Choi, J. C. Seo, H. K. Bae, J. K. Lee, Synthesis and curing of new aromatic azomethine epoxies with alkoxy side groups: Eur. Polym, 2004; 40, 259-265.
M. Brehmer, R. Zentel, Liquid Crystalline Elastomers-Characterization as Networks: Journal Molecular Crystals and Liquid Crystals Science and Technology Section A. Molecular Crystals and Liquid Crystals, 1994; 243, 353.
C. W. Tsaia, K. H. Wub, C. C. Yangc, G. P. Wang, Adamantane-based epoxy resin and siloxane-modified adamantane-based epoxy resin: Characterization of thermal, dielectric and optical properties, Reactive and Functional Polymers, 2015; 91–92, 11–18.
J. J. Mallon, P. M. Adams, Synthesis and characterization of novel epoxy monomers and liquid crystal thermosets, Journal of Polymer Science Part A: Polymer Chemistry, 1993; 31, 2249.
Z. Gao, Y. Yu, Y. Xu, S. Li., Synthesis and characterization of a liquid crystalline epoxy containing azomethine mesogen for modification of epoxy resin: Journal of Applied Polymer Science, 2007; 105, 1861-1868.
I. A. Mohammad, M. F. Ali, W. S. Wan Daud, New class of liquid crystalline epoxy resins: Synthesis and properties: Journal of Industrial and Engineering Chemistry, 2012; 18, 364-372.
E.-Joon Choi, Hung-Kun Ahn, Jong Keun Lee, Jung-Il Jin, Liquid crystalline twin epoxy monomers based on azomethine mesogen: synthesis and curing with aromatic diamines, Polymer, 2000; 41, 21, 7617–7625.
Yong-Ho Ahn, Myung-Sup Jung, Jin-Hae Chang, Synthesis and characterization of liquid crystals and their thermoset films, Materials Chemistry and Physics, 2010; 123, 1, 177-183.
H. Wang, Y. Zhang, L. Zhu, Z. Du, B. Zhang, Y. Zhang, Curing behaviors and kinetics of epoxy resins with a series of biphenyl curing agents having different methylene units, Thermochimica Acta, 521, 2011; 1–2, 18-25.
ASTM Designation, D 4145-83, Standard Test Method for Coating Flexibility of Prepainted Sheet, 1983, Reapproved 2002; 1-3.
ASTM Designation, D 3359-97, Standard Test Methods for Measuring Adhesion by Tape Test, 1997; 1-10.
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