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Mechanical Evaluation of Thermal Transitions in Polymer Nanofibres Using SPM

Published online by Cambridge University Press:  01 February 2011

Wei Wang ,
Shuangwu Li  and
Asa H. Barber
Wei Wang
Affiliation:
[email protected], Queen Mary, University of London, Department of Materials, Mile End Road, London, E1 4NS, United Kingdom, 0044 20 7882 7879, 0044 20 8981 9804
Shuangwu Li
Affiliation:
[email protected], Queen Mary, University of London, Department of Materials, Mile End Road, London, E1 4NS, United Kingdom
Asa H. Barber
Affiliation:
[email protected], Queen Mary, University of London, Department of Materials, Mile End Road, London, E1 4NS, United Kingdom
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Abstract

Polymer nanofibres produced by electrospinning techniques have unique mechanical properties due to their large surface area to volume ratio and potentially high molecular orientation. The effects of temperature on mechanical properties is challenging to measure due to the small fibre diameters produced. In this paper, scanning probe microscopy (SPM) is successfully used to elucidate the mechanical performance of individual electrospun polyvinyl alcohol (PVA) nanofibres over a range of temperatures. As observed in the results, thermal transitions have a dramatic effect on the mechanical behaviour of the nanofibres and are highlighted using SPM techniques analogous to dynamic mechanical thermal analysis but at the nanoscale. Interestingly, nanofibre thermal transitions are shown to be mediated by fibre diameter and the driving force of reducing the surface area of the nanofibre.

Keywords

microstructureelastic propertiesscanning probe microscopy (SPM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1025: Symposium B – Nanoscale Phenomena in Functional Materials by Scanning Probe Microscopy , 2007 , 1025-B10-02
Copyright
Copyright © Materials Research Society 2008

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