Side-chain Liquid Crystal Polymers (SCLCP): Methods and Materials. An Overview (original) (raw)
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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.
Macromolecules, 1992
04ld 1'e'44? I hojur Or ' CWsOnsC including tile tine to, reviewingq ifltruCt,0n1l %earthingq tri'It data I I~t'~ IIII~~ii itltniiii ij ll .h4P th~e .3Ijecjop of ,nforn'art If end comments regarding thr$ burden #trflnatC 0t any ot 4.PC 0 otrllII(I'IIII~IC I lii rden. t0 tVash,n 1 ,o, Had .at r i'ce. Directorate fior informino pe'tons and Repo(., "is t II~~~~iI~~I IIiI IIIIII i~ii.e o' maaq~emn md Budget. Paperwork Reduction Pro~ect (O7O4_C1BS). Washrrngton. OC 20503
Poly(4-vinylpyridine)-based hydrogen bonded side-chain liquid crystal polymers
Reactive & Functional Polymers, 2008
Novel liquid crystalline (LC) poly(4-vinylpyridine) (PVP)-based side-chain polymers were prepared from PVP and cyanobiphenyl (HOCnB) derivatives through intermolecular hydrogen-bonding between hydroxyl groups of the cyanobiphenyl derivatives and the nitrogen of PVP. PVP was used as a hydrogen bond acceptor polymer. A series of HOCnB having a linear alkoxy chain HOCnH 2n + 1 O-(n = 2-6) have been used as H-bond donor. The existence of H-bonding was confirmed using FTIR spectroscopy. The polymeric complexes behave as LC polymers and exhibit stable mesophases. DSC and optical microscopy were used to investigate LC behaviour. All PVP-LC-complexes exhibited stable and homogeneous nematic phases. On increasing spacer length or concentration of the hydrogen bonded mesogenic unit in the complex, the clearing temperature and the temperature range of the nematic phase increased. The binary phase diagram of the polymeric complexes PVP-HOCnB showed complete miscibility over the entire range of composition. Molecular interactions of self-assembled SCLCP presented the idea that various LC-complexes could be prepared through mixing a functionalised polymer with various low molar mass mesogens.
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.
Macromolecules, 1992
04ld 1'e'44? I hojur Or ' CWsOnsC including tile tine to, reviewingq ifltruCt,0n1l %earthingq tri'It data I I~t'~ IIII~~ii itltniiii ij ll .h4P th~e .3Ijecjop of ,nforn'art If end comments regarding thr$ burden #trflnatC 0t any ot 4.PC 0 otrllII(I'IIII~IC I lii rden. t0 tVash,n 1 ,o, Had .at r i'ce. Directorate fior informino pe'tons and Repo(., "is t II~~~~iI~~I IIiI IIIIII i~ii.e o' maaq~emn md Budget. Paperwork Reduction Pro~ect (O7O4_C1BS). Washrrngton. OC 20503
Supramolecular Side-Chain Liquid Crystalline Polymers with Various Kinked Pendant Groups
Macromolecules, 1998
Supramolecular side-chain liquid crystalline polymers with various kinked pendant groups are constructed from positional isomers of proton acceptor monomers and donor polymers (with different molecular weights) through hydrogen bonding. Monomer-monomer complexes of similar structures are built to compare the influence of the proton donors bound to the polymer backbones. Due to the bending effects introduced by the positional isomers, we are able to tune the molecular shape and thus to modify the mesogenic properties. New liquid crystalline properties are introduced by the kinked molecular geometry, and their kinked architecture is supported by the quantum mechanical calculations, the powder X-ray diffraction (XRD) patterns, and the deviation temperatures (∆T). Mesogenic properties of monomerpolymer complexes have similar trends as those of monomer-monomer complexes. Compared with analogous hydrogen-bonded (H-bonded) monomer-monomer complexes, higher isotropization temperatures and broader ranges of mesogenic phases (e.g., S A phase) are observed in the kinked supramolecular polymers. Significantly, H-bonded positional isomerism leads to dissimilar structures and properties of supramolecular side-chain liquid crystalline polymers.