Design and self-assembling behaviour of comb-like stereoregular cyclolinear methylsiloxane copolymers with chiral lactate groups. Issue 1 (2nd January 2019)

• Record Type: Journal Article
• Authors: Petrova, Irina; Gaj, Aleksej; Pochiecha, Damian; Shcherbina, Maksim; Makarova, Nataliya N.; Bubnov, Alexej
• Is Part Of: Liquid crystals. Volume 46:Issue 1(2019)
• Page Start: 25
• Page End: 36
• Publication Date: 2019-01-02
• Subjects: Methylsiloxane copolymer -- lactic acid derivative -- smectic phase -- chiral lactate group -- macromolecular liquid crystals; Liquid crystals -- Periodicals; 548.905
• DOI: 10.1080/02678292.2018.1461265
• Languages: English
• ISSNs: 0267-8292

Abstract

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. Graphical Abstract: