NDLI: Supramolecular side-chain liquid-crystal polymers. Part 1.—Thermal behaviour of blends of a low molar mass mesogenic acid and amorphous polymers

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Journal of Materials Chemistry Vol -4

Journal of Materials Chemistry Vol -3

Supramolecular side-chain liquid-crystal polymers. Part 1.—Thermal behaviour of blends of a low molar mass mesogenic acid and amorphous polymers

Content Provider	Royal Society of Chemistry (RSC)
Author	Stewart, David Imrie, Corrie T.
Copyright Year	1995
Abstract	The thermal behaviour of blends of 6-(4-n-butylazobenzene-4′-oxy)hexanoic acid (BABOHA) with three Polymers, polystyrene (PS), poly(2-vinylpyridine)(P2VP) and poly(4-vinylpyridine)(P4VP) has been characterised using differential scanning calorimetry and polarised light microscopy. BABOHA is a monotropic nematogen and its thermal behaviour is determined largely by hydrogen-bonded dimeric species. BABOHA is effectively immiscible with PS and thus, the thermal behaviour of BABOHA in the PS–BABOHA blends was essentially identical to that of pure BABOHA. In contrast, the transition temperatures of BABOHA are dramatically reduced in the blends with both P4VP and P2VP. The nematicisotropic transition temperature is reduced to a greater extent than the crystal–isotropic transition temperature. The driving force for miscibility in these systems is the formation of a hydrogen bond between the acid and pyridine groups. This thermal behaviour cannot be rationalised using the non-covalently attached side-chain liquid-crystal Polymer model suggested by Bazuin and Brandys (Chem. Mater., 1992, 4, 970). Instead we propose that the behaviour of the P2VP–BABOHA and P4VP–BABOHA blends may be understood by considering partial complexation of the Polymer by the acid, with this species acting as an isotropic solute in the liquid-crystal phase thus reducing the melting and clearing temperatures.
Starting Page	223
Ending Page	228
Page Count	6
File Format	PDF
ISSN	09599428
Volume Number	5
Issue Number	2
Journal	Journal of Materials Chemistry
DOI	10.1039/JM9950500223
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	BABOHA Chem Bazuin Brandys Carboxylic acid Polystyrene Differential scanning calorimetry Optical microscope Hydrogen bond Pyridine Isotropy
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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