NDLI: Mesogen jacketed liquid crystalline polyacetylene containing triphenylene discogen: synthesis and phase structure

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Polymer Chemistry Vol - 4 Issue - 3

Polymer Chemistry Vol -3

Polymer Chemistry Vol -2

Polymer Chemistry Vol -1

Mesogen jacketed liquid crystalline polyacetylene containing triphenylene discogen: synthesis and phase structure

Content Provider	Royal Society of Chemistry (RSC)
Author	Yang, Shuang Lin, Jie-Sheng Liu, Jian-Hong Chen, Er-Qiang Yu, Zhen-Qiang Lam, Jacky W. Y. Li, Bing Shi Zhao, Keqing Zhu, Cai-Zhen Tang, Ben Zhong
Copyright Year	2013
Abstract	Triphenylene-containing acetylenes with one or three methylene units as spacers and the corresponding mesogen-jacketed liquid crystalline polyacetylenes (MJLCPAs) were designed and synthesized, the mesomorphic properties and phase behaviors of the monomers and novel side-chain liquid crystalline polymers were investigated. The monomers [HCC(CH2)mC18H6(OC6H13)5; m = 1, 3] are prepared by consecutive etherization, coupling, and etherization reactions, and the chemical structures were confirmed by mass spectroscopy and 1H/13C-NMR. The phase behaviors of the monomers were investigated by differential scanning calorimetry (DSC), polarized light microscopy (PLM), and wide-angle X-ray diffraction (WAXD). The results show that both of the monomers form a hexagonal columnar liquid crystal phase at room temperature. The monomers are polymerized using [Rh(nbd)Cl]2 as catalyst and producing soluble polymers in the yields of 55% and 52%, respectively. The chemical structures and phase behaviors of the two polymers are characterized and evaluated by IR, NMR, TGA, DSC, and WAXD analyses. Both of the two polymers show enhanced thermal and chemical stability with thermal decomposition temperatures up to higher than 340 °C due to the protection of the “jacketed effect” of the side-chain triphenylenes wrapped around the rigid polyacetylene main-chain. The polymers adopt a columnar shaped structure and self-organized into hexagonally packed columnar phase. The relative electron density maps of the columnar structure are also reconstructed.
Starting Page	996
Ending Page	1005
Page Count	10
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	4
Issue Number	4
Journal	Polymer Chemistry
DOI	10.1039/c2py20535a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	X-ray crystallography Spectroscopy Differential scanning calorimetry Liquid crystal DSC Optical microscope Nuclear magnetic resonance Methylene group Polyacetylene Columnar phase
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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