Citation: Jian-feng Ban, Sheng Chen, Hai-liang Zhang. Synthesis and Liquid Crystalline Behavior of Side Chain Liquid Crystalline Polymers Containing Triphenylene Discotic Mesogens with Different Length Flexible Spacers[J]. Chinese Journal of Polymer Science, ;2015, 33(9): 1245-1259. doi: 10.1007/s10118-015-1672-5 shu

Synthesis and Liquid Crystalline Behavior of Side Chain Liquid Crystalline Polymers Containing Triphenylene Discotic Mesogens with Different Length Flexible Spacers

1.
Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, Key Laboratory of Advanced Functional Polymer Materials of Colleges and Universities of Hunan Province, College of Chemistry, Xiangtan University, Xiangtan 411105, China

Received Date: 21 January 2015
Revised Date: 14 March 2015

Fund Project: This work was financially supported by the National Natural Science Foundation of China (No. 51373148) and the Innovation Platform Open Foundation of University of Hunan Province (No. CX2013B265).

A series of side chain liquid crystalline polymers (SCLCPs) containing triphenylene (Tp) units in the side chains, denoted as PMTS (without spacer) and PMTnS (n = 2, 3, 4, 6, which is the number of the methylene units between the main chain and Tp moieties in the side chains), with different lengths of spacers were synthesized through conventional free radical polymerization. The chemical structures of the monomers were confirmed by 1H/13C-NMR, and the phase behaviors were examined by differential scanning calorimetry (DSC), polarized optical microscopy (POM) and wide-angle X-ray diffraction (1D and 2D WAXD). The molecular characterization of the polymers was performed with 1H-NMR, gel permeation chromatography (GPC) and thermogravimetric analysis (TGA). The phase behaviors of the polymers have been investigated by a combination of techniques including DSC, POM, 1D and 2D WAXD. The results showed that the length of spacer has significant effects on the LC phase behavior of polymers. For PMTS and PMT2S, they displayed the columnar phase developed by the Tp moieties and the main chain as a whole due to the strong coupling effect of the Tp moieties and the main chain. For the PMT3S, PMT4S and PMT6S, they formed the symmetry hexagonal columnar (H) phase owing to the decoupling effect. All of these indicated that the decoupling effect or coupling effect depended on the length of spacers, leading to the different LC phase formation mechanism.
- Liquid crystalline polymer,
- Triphenylene,
- Flexible spacer,
- Phase behavior,
- Columnar phase
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