Naphthalene group containing side chain liquid crystalline polymers and their rheological behavior (original) (raw)
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Macromolecular Chemistry and Physics, 2004
A new type of side-chain liquid-crystalline polysiloxane was synthesised by graft copolymerisation, using (trans, trans)-4-propyl-4'-vinylbicyclohexane exhibiting platelet texture of a blue phase as a mesogenic monomer. The graft copolymerisation was confirmed by characterising the chemical structure of the mesogenic monomer and the polymer by FT-IR, 1 H NMR and 13 C NMR. Microstructures of the mesogenic monomer and the polymer were analysed by polarising optical microscopy and X-ray diffraction. Thermal properties of the mesogenic monomer and the polymer were studied by differential scanning calorimetry (DSC). Meanwhile, the spherulite texture of the polymeric smectic A phase of the mesogenic polymer was revealed in the cooling process by polarising optical microscopy. This texture is uncommon in other liquid crystalline polymers.
Molecular engineering of side-chain liquid crystalline polymers by living polymerizations
Progress in Polymer Science, 1997
Living" anionic, cationic, metalloporphyrin and ring-opening metathesis polymer izations have been used to prepare well-defined side-chain liquid crystalline homopolymers, block and graft copolymers and statistical copolymers. This paper analyzes their successes and failures by reviewing the mechanistic aspects and experimental conditions of each type of polymerization, and identifies other classes of mesogenic monomers that could be polymerized in a controlled manner in the future. The emerging structure/property relationships are then identified using well defined SCLCPs in which only one structural feature is varied while all others remain constant.
Side-chain Liquid Crystal Polymers (SCLCP): Methods and Materials. An Overview
Materials, 2009
This review focuses on recent developments in the chemistry of side chain liquid crystal polymers. It concentrates on current trends in synthetic methods and novel, well defined structures, supramolecular arrangements, properties, and applications. The review covers literature published in this century, apart from some areas, such as dendritic and elastomeric systems, which have been recently reviewed.
Synthesis and structure of liquid-crystalline side-chain polymers
Pure and Applied Chemistry, 2000
The synthesis, structure and some properties of therrn6tropic liquid crystalline polymers with side xnesogenic groups are discussed. Approaches towards the synthesis of such systems are presented, as well as the data revealing the relationship between the molecular structure of the liquid-. crystalline polymers and the type of mesophase formed. The structure of smectic, nematic and cholesteric mesophases as well as models of chain packing in them are analyzed. The possibility to affect the strtcture of a liquid-crystalline polymer by an electric field is demonstrated.
Journal of Polymer Science Part A: Polymer Chemistry, 1989
Copolymerization of monomers containing the disiloxane unit in the spacer component and linear triple-core mesogens with comonomers containing linear double-core mesogens, or laterally attached triple-core mesogens was carried out radically. The effect of copolymer composition and monomer structure on the mesomorphic properties of the obtained copolymers was investigated in detail. The copolymers with a comonomer content up to 50 mol-%, exhibit an enantiotropic nematic phase, whereas the parent homopolymers containing triple-core mesogens exhibit a smectic phase. The copolymer containing more than 50 mol-To of the comonomer shows no mesophase. The isotropization temperature of the copolymers decreases with increasing comonomer content. However, the glass transition temperature is almost unchanged upon introduction of the comonomer unit. In case of copolymers containing laterally attached mesogens, a smectic phase was observed below the temperature range of the nematic phase. Consequently, the mesophase and the temperature range of the liquid-crystalline state can be controlled by the introduction of the comonomer unit whose parent homopolymer does not exhibit any mesophase.