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Relationships Between the Morphology and Thermoresponsive Behavior in micro/nanostructured Thermosetting Matrixes Containing a 4'-(hexyloxy)-4-biphenylcarbonitrile Liquid Crystal

Relationships Between the Morphology and Thermoresponsive Behavior in micro/nanostructured Thermosetting Matrixes Containing a 4'-(hexyloxy)-4-biphenylcarbonitrile Liquid Crystal

Agnieszka Tercjak, Iñaki Mondragon

Langmuir. 2008 Oct 7;24(19):11216-24.

PMID: 18774830

Abstract:

Meso/nanostructured thermoresponsive thermosetting materials based on an epoxy resin modified with two different molecular weight amphiphilic poly(styrene- block-ethylene oxide) block copolymers (PSEO) and a low molecular weight liquid crystal, 4'-(hexyloxy)-4-biphenylcarbonitrile (HOBC), were investigated. A strong influence of the addition of PSEO on the morphology generated in HOBC--(diglicydyl ether of bisphenol A epoxy resin/ m-xylylenediamine) was detected, especially in the case of the addition of PSEO block copolymers with a higher PEO-block content and a lower molecular weight. The morphologies generated in the ternary systems also influenced the thermoresponsive behavior of the HOBC separated phase provoked by applying an external field, such as a temperature gradient and an electrical field. Thermal analysis of the investigated materials allowed for a better understanding of the relationships between generated morphology/thermo-optical properties/PSEO:HOBC ratio, and HOBC content. Controlling the relationship between the morphology and thermoresponsive behavior in micro/nanostructured thermosetting materials based on a 4'-(hexyloxy)-4-biphenylcarbonitrile liquid crystal allows the development of materials which can find application in thermo- and in some cases electroresponsive devices, with a high contrast ratio between transparent and opaque states.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP41424117	4′-(Hexyloxy)-4-biphenylcarbonitrile		41424-11-7	Price

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