THE EFFECT OF SUBSTITUENT ON THE THERMAL PROPERTIES OF POLYESTERS CONSISTING OF AROMATIC TYPE SCHIFF BASE MESOGENIC UNITS AND POLYMETHYLENE SPACERS

THE EFFECT OF SUBSTITUENT ON THE THERMAL PROPERTIES OF POLYESTERS CONSISTING OF AROMATIC TYPE SCHIFF BASE MESOGENIC UNITS AND POLYMETHYLENE SPACERS

Polyesters consisting of substituted aromatic type Schiff base mesogenic unit andpolymethylene spacers were synthesized and their thermal transitions and liquid crystallineproperties were studied. The liquid crystalline behaviour has been characterized by differentialscanning calorimetry (DSC) and o...

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Veröffentlicht in:高分子科学：英文版 1995 (1), p.51-58
1. Verfasser: Amar H.Al-Dujaili Iman F.Mustafa Amir T.Atto
Format: Artikel
Sprache:eng
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Aromatic
base
crystal
Liquid
Mesogenic
Polyesters
polymer
schiff
Spacers
type
units
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creator Amar H.Al-Dujaili Iman F.Mustafa Amir T.Atto
description Polyesters consisting of substituted aromatic type Schiff base mesogenic unit andpolymethylene spacers were synthesized and their thermal transitions and liquid crystallineproperties were studied. The liquid crystalline behaviour has been characterized by differentialscanning calorimetry (DSC) and optical polarizing microscopy. Structural broadening bysubstitution of methoxy group in 2, 2" positions of the mesogenic core produce polymers withlower transition temperatures. Polymers synthesized from ortho and meta substituted phenylenediamine did not form a liquid crystal phase.
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The liquid crystalline behaviour has been characterized by differentialscanning calorimetry (DSC) and optical polarizing microscopy. Structural broadening bysubstitution of methoxy group in 2, 2&amp;quot; positions of the mesogenic core produce polymers withlower transition temperatures. 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identifier ISSN: 0256-7679
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language eng
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source Alma/SFX Local Collection
subjects Aromatic
base
crystal
Liquid
Mesogenic
Polyesters
polymer
schiff
Spacers
type
units
title THE EFFECT OF SUBSTITUENT ON THE THERMAL PROPERTIES OF POLYESTERS CONSISTING OF AROMATIC TYPE SCHIFF BASE MESOGENIC UNITS AND POLYMETHYLENE SPACERS
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