Hybrid electrospun nonwovens from chitosan/cellulose acetate

George Salihu, Parikshit Goswami, Stephen Russell

Research output: Contribution to journalArticle

14 Citations (Scopus)

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 (NH 3 +CF 3COO -). 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.

Original languageEnglish
Pages (from-to)739-749
Number of pages11
JournalCellulose
Volume19
Issue number3
Early online date16 Feb 2012
DOIs
Publication statusPublished - Jun 2012
Externally publishedYes

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