Miscibility and Liquid Crystal Behaviour of P-Azoxy Anisole in Polymer Blends
作者:
Mariano Pracella,
Bruno Bresci,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1995)
卷期:
Volume 266,
issue 1
页码: 23-33
ISSN:1058-725X
年代: 1995
DOI:10.1080/10587259508033629
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The phase behaviour of two polymer/liquid crystal blends has been investigated by DSC and optical microscopy. In one case, blends of poly(octadecylethylene) (POE) and p-azoxyanisole (PAA) are found almost immiscible below the isotropization temperature of the liquid crystal. The crystallization process of PAA in the blends takes place with a sporadic growth of dendritic structures determined by the dispersion of the nematic phase in the molten polymer. In the other case, blends of poly(biphenylyloxyexylacrylate) (PBHA) and PAA display a different phase behaviour indicating partial miscibility of the two components at temperatures above the melting point of the polymer. At high concentrations of PAA a nematic phase dispersed in a isotropic liquid mixture of polymer and liquid crystal is observed. These results are accounted for by the different side-chain structure of the polymer components.
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