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Evolution of Surface Nanopores in Pressurised Gyrospun Polymeric Microfibers

Illangakoon, UE; Mahalingam, S; Matharu, RK; Edirisinghe, M; (2017) Evolution of Surface Nanopores in Pressurised Gyrospun Polymeric Microfibers. Polymers , 9 (10) , Article 508. 10.3390/polym9100508. Green open access

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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.

Type: Article
Title: Evolution of Surface Nanopores in Pressurised Gyrospun Polymeric Microfibers
Open access status: An open access version is available from UCL Discovery
DOI: 10.3390/polym9100508
Publisher version: http://dx.doi.org/10.3390/polym9100508
Language: English
Additional information: 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) (https://creativecommons.org/licenses/by/4.0/).
Keywords: pressure; gyration; polymer; microfibers; nanopores; surface
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10039919
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