Design and self-assembling behaviour of comb-like stereoregular cyclolinear methylsiloxane copolymers with chiral lactate groups |
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Authors: | Irina Petrova Aleksej Gaj Damian Pochiecha Maksim Shcherbina Nataliya N Makarova |
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Institution: | 1. A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova, Russian Federation;2. Gymnázium Christiana Dopplera, Prague, Czech Republic;3. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic;4. Faculty of Chemistry, Warsaw University, Warsaw, Poland;5. N.S.Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Sciences, Moscow, Russian Federation |
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Abstract: | Several new comb-like stereoregular cyclolinear methylsiloxane copolymers exhibiting the self-assembling behaviour have been designed and studied. For the resulting macromolecular materials, the chiral mesogenic unit, namely (S)-(–)-4-1-ethoxycarbonyl)ethoxycarbonyl]phenyl-4′-11-tetramethyldisiloxyl)-undecenyloxy)-biphenyl-4′-carboxylate, has been used as a side group to assure the mesomorphic behaviour. The mesomorphic and structural properties were studied by the polarising optical microscopy, differential scanning calorimetry and small-/wide-angle X-ray diffraction techniques. The designed copolymers form the orthogonal smectic A* and the tilted smectic C* phases over relatively broad temperature range, down to room temperatures. The obtained results are discussed in order to contribute to better understanding of the molecular architecture–nano-organisation relationship for a specific type of macromolecular system based on the lactic acid derivatives used as a flexible side groups. |
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Keywords: | Methylsiloxane copolymer lactic acid derivative smectic phase chiral lactate group macromolecular liquid crystals |
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