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Influence of Molecular Ordering on Surface Free Energy of Polymer Nanofibres using Scanning Probe Microscopy

Published online by Cambridge University Press:  01 February 2011

Shuangwu Li ,
Wei Wang  and
Asa H Barber
Shuangwu Li
Affiliation:
[email protected], Queen Mary College, University of London, Materials, Mile End Road,, London, E1 4NS, United Kingdom, +44(0)20 7882 7879, +44(0)20 8981 9804
Wei Wang
Affiliation:
[email protected], Queen Mary College, University of London, Department of Materials, Mile End Road,, London, E1 4NS, United Kingdom
Asa H Barber
Affiliation:
[email protected], Queen Mary College, University of London, Department of Materials, Mile End Road,, London, E1 4NS, United Kingdom
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Abstract

Fibrous materials are used in a variety of applications due to their relatively high surface area to volume as well as anisotropic behavior. Electrospinning is a popular fabrication method which produces polymer nanofibres with a potentially high molecular alignment. In this work we examine the surface free energy of electrospun polyvinyl-alcohol nanofibres and its relation to molecular ordering using scanning probe microscopy adhesion measurements. Comparisons are made with bulk polymer material to show that a high degree of molecular orientation is present at least at the surface of the polymer nanofibre. As a result, the surface free energy of electrospun polymer nanofibres is greater than that of a bulk polymer. This effect indicates that the electrospinning process is effective at polymer alignment over a variety of experimental parameters.

Keywords

nanoscalefiberscanning 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-B12-10
Copyright
Copyright © Materials Research Society 2008

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