Synthesis and characterization of polyurethane-based side-chain cholesteric liquid crystal polymers |
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Authors: | R N Jana Jae Whan Cho |
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Institution: | (1) The Research Centre for Molecular Science and Engineering, Northeastern University, Shenyang, 110004, People’s Republic of China;(2) School of Chemistry, Cardiff University, Cardiff, UK; |
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Abstract: | Polyurethane-based side-chain cholesteric liquid crystalline polymers (ChLCPs) with variable clearing temperatures were synthesized
in a two-step reaction. The chemical structures of ChLCPs were confirmed by FT-IR and 1H-NMR spectroscopy. The mesogenic properties and phase transition behavior were investigated by means of differential scanning
calorimetry (DSC), polarizing optical microscopy (POM), and X-ray diffraction measurements. The DSC studies show that the
melting temperature and isotropic transition temperature of the ChLCPs increased with the weight percentage of cholesterol
in the polymer. POM shows that the ChLCPs had a distinct spherulite structure that melted at about 140 °C, and these results
are consistent with those of the DSC studies. The thermogravimetric studies show that the ChLCPs were stable up to 200 °C,
though there was a reduction in the thermal stability as the weight proportion of cholesterol and glycerol in the polymer
increased. |
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Keywords: | |
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