Synthesis,structure, and mesomorphic properties of main-chain liquid-crystalline ionomers containing sulfonate groups |
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Authors: | X Y Xu B Y Zhang W M Gu L X Wang |
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Affiliation: | (1) The Centre for Molecular Science and Engineering, Northeastern University, Shenyang, 11004, People’s Republic of China |
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Abstract: | The mesogenic monomer M and a series of main-chain liquid crystalline ionomers (LCIs) containing sulfonate groups were synthesized.
The LCIs were prepared by an interfacial condensation reaction of mesogenic monomer 1,4-phenylene-dicarbonic acid bis (4-carboxyl
phenyl) ester, brittle yellow (BY), 1,10-sebacoyl dihydroxy, and 1,12-dodecanedioyl dihydroxy. The sulfonate groups introduced
to the main-chain backbone were confirmed by ultraviolet spectroscopy. The mesomorphic properties were investigated by differential
scanning calorimetry (DSC), thermo gravimetric (TG), and polarizing optical microscopy (POM). Experimental results demonstrated
that the glass-transition temperatures increased slightly, melting temperature decreased, and the mesophase temperature ranges
increased first and then decreased with increasing content of sulfonate group. All of the polymers were thermally stable up
to 320 °C. The LCI
n
s exhibited typical nematic schlieren textures. |
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Keywords: | |
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