Hybrid electrospun nonwovens from chitosan/cellulose acetate |
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Authors: | George Salihu Parikshit Goswami Stephen Russell |
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Institution: | (1) Nonwovens Research Group, Centre for Technical Textiles, University of Leeds, Leeds, UK;(2) Sustainable Materials Research Group, Centre for Technical Textiles, University of Leeds, Leeds, UK; |
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Abstract: | Co-mixtures of chitosan (CS) and cellulose acetate (CA) were electrospun into fibrous webs from a binary co-solvent containing
70:30 trifluoroacetic acid (TFA): methylene chloride (DCM). Fibrous webs were produced from CS/CA in ratios (wt%) of 20:80,
40:60, 50:50 and 60:40. As determined by SEM analysis, 12% polymer solutions of CS/CA 60:40 produced structures with uniform
bead free fibre morphologies with an average fibre diameter of 458 nm. FTIR-spectroscopy confirmed the presence of CS in the
as-spun fibres in the form of chitosan-amine trifluoroacetate salts (NH3
+CF3COO−). Uniform mixing of the CS and CA components was confirmed by DSC analyses. Alkaline neutralisation of the chitosan amine
salts was explored as a means of increasing wet stability. The as-spun fibres were found to be relatively unstable in aqueous
medium due to the solubility of the chitosan amine salts. Alkaline post-neutralisation was evaluated as means of minimising
weight loss and maximising retention of fibrous structure. |
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Keywords: | |
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