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Int. J. Mol. Sci. 2014, 15(4), 5634-5648; doi:10.3390/ijms15045634
Article

Liquid Crystalline Assembly of Coil-Rod-Coil Molecules with Lateral Methyl Groups into 3-D Hexagonal and Tetragonal Assemblies

1,†
, 1,†
, 2
, 3
, 1,*  and 1,*
Received: 16 October 2013; in revised form: 3 March 2014 / Accepted: 11 March 2014 / Published: 2 April 2014
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Abstract: In this paper, we report the synthesis and self-assembly behavior of coil-rod-coil molecules, consisting of three biphenyls linked through a vinylene unit as a conjugated rod segment and poly(ethylene oxide) (PEO) with a degree of polymerization (DP) of 7, 12 and 17, incorporating lateral methyl groups between the rod and coil segments as the coil segment. Self-organized investigation of these molecules by means of differential scanning calorimetry (DSC), thermal polarized optical microscopy (POM) and X-ray diffraction (XRD) reveals that the lateral methyl groups attached to the surface of rod and coil segments, dramatically influence the self-assembling behavior in the liquid-crystalline mesophase. Molecule 1 with a relatively short PEO coil length (DP = 7) self-assembles into rectangular and oblique 2-dimensional columnar assemblies, whereas molecules 2 and 3 with DP of 12 and 17 respectively, spontaneously self-organize into unusual 3-dimensional hexagonal close-packed or body-centered tetragonal assemblies.
Keywords: coil-rod-coil; self-assembly; columnar; hexagonal; tetragonal; small angle X-ray scattering (SAXS) coil-rod-coil; self-assembly; columnar; hexagonal; tetragonal; small angle X-ray scattering (SAXS)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Wang, Z.; Lan, Y.; Zhong, K.; Liang, Y.; Chen, T.; Jin, L.Y. Liquid Crystalline Assembly of Coil-Rod-Coil Molecules with Lateral Methyl Groups into 3-D Hexagonal and Tetragonal Assemblies. Int. J. Mol. Sci. 2014, 15, 5634-5648.

AMA Style

Wang Z, Lan Y, Zhong K, Liang Y, Chen T, Jin LY. Liquid Crystalline Assembly of Coil-Rod-Coil Molecules with Lateral Methyl Groups into 3-D Hexagonal and Tetragonal Assemblies. International Journal of Molecular Sciences. 2014; 15(4):5634-5648.

Chicago/Turabian Style

Wang, Zhuoshi; Lan, Yu; Zhong, Keli; Liang, Yongri; Chen, Tie; Jin, Long Y. 2014. "Liquid Crystalline Assembly of Coil-Rod-Coil Molecules with Lateral Methyl Groups into 3-D Hexagonal and Tetragonal Assemblies." Int. J. Mol. Sci. 15, no. 4: 5634-5648.


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