Electrospinning combined with nonsolvent-induced phase separation to fabricate highly porous and hollow submicrometer polymer fibers

Nayani, K and Katepalli, H and Sharma, Chandra Shekhar and Sharma, A and Patil, S and Venkataraghavan, R (2012) Electrospinning combined with nonsolvent-induced phase separation to fabricate highly porous and hollow submicrometer polymer fibers. Industrial and Engineering Chemistry Research, 51 (4). pp. 1761-1766. ISSN 0888-5885

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Abstract

A simple and efficient method to induce porosity both in the core and on the surface of electrospun submicrometer polymer fibers has been demonstrated by combining nonsolvent-induced phase separation with electrospinning. In this modified electrospinning process, fibers are collected in a bath filled with a nonsolvent for the polymer being electrospun. The presence of residual solvent in the nanofibers causes phase separation once the fibers reach the nonsolvent bath. Poly(acrylonitrile) (PAN) in dimethylformamide (DMF) is chosen as the model polymer/solvent system. The versatility of the approach is demonstrated by extending the technique to poly(styrene)/DMF, poly(styrene)/toluene, and poly(methyl methacrylate)/DMF systems. With a suitable solvent (ethanol) and optimized tip-to-collector distance, the specific surface area of the porous PAN fibers increased to an order of magnitude compared to that of the smooth fibers obtained by the conventional electrospinning. Further, this electrospinning technique is extended to core-shell electrospinning, enabling the fabrication directly in one step of PAN-based hollow fibers having porosity both in the surface and the bulk

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IITH Creators:

IITH Creators	ORCiD
Sharma, Chandra Shekhar	UNSPECIFIED

Item Type:

Article

Uncontrolled Keywords:

Core-shell; Electrospinning process; Electrospinning techniques; Electrospuns; Hollow fiber; Non-solvents; Nonsolvent-induced phase separation; One step; PAN fiber; Polymer fiber; Residual solvents; Submicrometers; Tip-to-collector distance

Subjects:

Chemical Engineering > Biochemical Engineering

Divisions:

Department of Chemical Engineering

Depositing User:

Team Library

Date Deposited:

17 Nov 2014 05:40

Last Modified:

22 Jan 2019 05:44

URI:

http://raiithold.iith.ac.in/id/eprint/822