Nanopaper membranes from chitin-protein composite nanofibers: Structure and mechanical properties
2014 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 131, no 7, 40121- p.Article in journal (Refereed) Published
Chitin nanofibers may be of interest as a component for nanocomposites. Composite nanofibers are therefore isolated from crab shells in order to characterize structure and analyze property potential. The mechanical properties of the porous nanopaper structures are much superior to regenerated chitin membranes. The nanofiber filtration-processing route is much more environmentally friendly than for regenerated chitin. Minerals and extractives are removed using HCl and ethanol, respectively, followed by mild NaOH treatment and mechanical homogenization to maintain chitin-protein structure in the nanofibers produced. Atomic force microscope (AFM) and scanning transmission electron microscope (STEM) reveal the structure of chitin-protein composite nanofibers. The presence of protein is confirmed by colorimetric method. Porous nanopaper membranes are prepared by simple filtration in such a way that different nanofiber volume fractions are obtained: 43%, 52%, 68%, and 78%. Moisture sorption isotherms, structural properties, and mechanical properties of membranes are measured and analyzed. The current material is environmentally friendly, the techniques employed for both individualization and membrane preparation are simple and green, and the results are of interest for development of nanomaterials and biocomposites.
Place, publisher, year, edition, pages
2014. Vol. 131, no 7, 40121- p.
biomaterials, fibers, mechanical properties, membranes, porous materials
IdentifiersURN: urn:nbn:se:kth:diva-142316DOI: 10.1002/app.40121ISI: 000331004100054ScopusID: 2-s2.0-84892586454OAI: oai:DiVA.org:kth-142316DiVA: diva2:703009
QC 201403052014-03-052014-02-282014-11-10Bibliographically approved