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Polymers 2017, 9(10), 508; https://doi.org/10.3390/polym9100508

Evolution of Surface Nanopores in Pressurised Gyrospun Polymeric Microfibers

Department of Mechanical Engineering, University College London, London WC1E 7JE, UK
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Received: 19 September 2017 / Revised: 2 October 2017 / Accepted: 6 October 2017 / Published: 13 October 2017
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Abstract

The selection of a solvent or solvent system and the ensuing polymer–solvent interactions are crucial factors affecting the preparation of fibers with multiple morphologies. A range of poly(methylmethacrylate) fibers were prepared by pressurised gyration using acetone, chloroform, N,N-dimethylformamide (DMF), ethyl acetate and dichloromethane as solvents. It was found that microscale fibers with surface nanopores were formed when using chloroform, ethyl acetate and dichloromethane and poreless fibers were formed when using acetone and DMF as the solvent. These observations are explained on the basis of the physical properties of the solvents and mechanisms of pore formation. The formation of porous fibers is caused by many solvent properties such as volatility, solubility parameters, vapour pressure and surface tension. Cross-sectional images show that the nanopores are only on the surface of the fibers and they were not inter-connected. Further, the results show that fibers with desired nanopores (40–400 nm) can be prepared by carefully selecting the solvent and applied pressure in the gyration process. View Full-Text
Keywords: pressure; gyration; polymer; microfibers; nanopores; surface pressure; gyration; polymer; microfibers; nanopores; surface
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Illangakoon, U.E.; Mahalingam, S.; Matharu, R.K.; Edirisinghe, M. Evolution of Surface Nanopores in Pressurised Gyrospun Polymeric Microfibers. Polymers 2017, 9, 508.

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