Thermo-active polymer nanocomposites: a spectroscopic study

Winter, A.D. and Larios, E. and Jay, C. and FIscher, D.A. and Omastova, M. and Campo, E.M. (2014) Thermo-active polymer nanocomposites: a spectroscopic study. Proceedings of SPIE, Nanoengineering: Fabrication, Properties, Optics, and Devices XI, 9170. p. 917003. DOI: 10.1117/12.2064904

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Photo- and thermo-mechanical actuation behaviour in specific polymer-carbon nanotube composites has been observed in recent years and studied at the macroscale. These systems may prove to be suitable components for a wide range of applications, from MOEMs and nanotechnology to neuroscience and tissue engineering. Absence of a unified model for actuation behaviour at a molecular level is hindering development of such smart materials. We observed thermomechanical actuation of ethylene-vinyl acetate | carbon nanotube composites through in situ near-edge X-ray absorption fine structure spectroscopy to correlate spectral trends with macroscopic observations. This paper presents spectra of composites and constituents at room temperature to identify resonances in a building block model, followed by spectra acquired during thermo-actuation. Effects of strain-induced filler alignment are also addressed. Spectral resonances associated with C=C and C=O groups underwent synchronised intensity variations during excitation, and were used to propose a conformational model of actuation based on carbon nanotube torsion. Future actuation studies on other active polymer nanocomposites will verify the universality of the proposed model.

Item Type: Article
Subjects: Research Publications
Departments: College of Physical and Applied Sciences > School of Electronic Engineering
Date Deposited: 25 Sep 2015 02:33
Last Modified: 26 Sep 2015 02:29
ISSN: 0277-786X
URI: http://e.bangor.ac.uk/id/eprint/5422
Identification Number: DOI: 10.1117/12.2064904
Publisher: SPIE
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