Research output: Contribution to journal › Conference article › peer-review
Molecular and mesomorphic properties of alkylene-aromatic polyesters containing fluorinated spacers. / Rjumtsev, E. I.; Sokolova, O. S.; Lezov, A. V.; Antonov, E. A.; Mel'nikov, A. B.; Bilibin, A. Yu.
In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 3319, 1997, p. 236-239.Research output: Contribution to journal › Conference article › peer-review
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TY - JOUR
T1 - Molecular and mesomorphic properties of alkylene-aromatic polyesters containing fluorinated spacers
AU - Rjumtsev, E. I.
AU - Sokolova, O. S.
AU - Lezov, A. V.
AU - Antonov, E. A.
AU - Mel'nikov, A. B.
AU - Bilibin, A. Yu
PY - 1997
Y1 - 1997
N2 - Two series of thermotropic liquid crystalline main-chain fluorine-containing polyesters, based on fluorinated alkylene diols and terephthaloyl-bis-(4-oxybenzoylchloride) and its analogue containing nitrogroup in the central phenylene ring were studied by polarizing microscopy, differential scanning calorimetry, viscometry, isothermic diffusion and electric birefringence methods. The upper limit of the fluorinated spacer length, when these polyesters lose their ability to form mesophase was found. It was established that the melting temperatures of the polyesters did not decrease with increasing number of CF2 groups in the spacer. The nematic textures of the investigated polymers were observed in cross polarizers. The differences in conformational and electrooptical properties of polyesters with fluoro- and hydrocarbon spacers were found. The dipole mechanism of the polyester molecules orientation in electric field was revealed. Two series of low-molecular-weight liquid crystalline compounds were synthesized to compare their properties with those of the polymers of similar structure. These esters exhibited a tendency to form smectic phase. The influence of the alkyl end group length on the mesomorphic properties of the esters was found.
AB - Two series of thermotropic liquid crystalline main-chain fluorine-containing polyesters, based on fluorinated alkylene diols and terephthaloyl-bis-(4-oxybenzoylchloride) and its analogue containing nitrogroup in the central phenylene ring were studied by polarizing microscopy, differential scanning calorimetry, viscometry, isothermic diffusion and electric birefringence methods. The upper limit of the fluorinated spacer length, when these polyesters lose their ability to form mesophase was found. It was established that the melting temperatures of the polyesters did not decrease with increasing number of CF2 groups in the spacer. The nematic textures of the investigated polymers were observed in cross polarizers. The differences in conformational and electrooptical properties of polyesters with fluoro- and hydrocarbon spacers were found. The dipole mechanism of the polyester molecules orientation in electric field was revealed. Two series of low-molecular-weight liquid crystalline compounds were synthesized to compare their properties with those of the polymers of similar structure. These esters exhibited a tendency to form smectic phase. The influence of the alkyl end group length on the mesomorphic properties of the esters was found.
KW - Alkylene-aromatic fluorocontainig polyesters
KW - Conformation
KW - Electrooptics
KW - Liquid crystals
KW - Melt
KW - Modeling compounds
KW - Phase transitions
KW - Relaxation
KW - Solution
UR - http://www.scopus.com/inward/record.url?scp=0031391916&partnerID=8YFLogxK
U2 - 10.1117/12.301291
DO - 10.1117/12.301291
M3 - Conference article
AN - SCOPUS:0031391916
VL - 3319
SP - 236
EP - 239
JO - Proceedings of SPIE - The International Society for Optical Engineering
JF - Proceedings of SPIE - The International Society for Optical Engineering
SN - 0277-786X
T2 - Liquid Crystals: Chemistry and Structure
Y2 - 3 March 1997 through 8 March 1997
ER -
ID: 94257904