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Strong and Tough Chitin Film from alpha-Chitin Nanofibers Prepared by High Pressure Homogenization and Chitosan Addition
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. Department of Mechanical and Industrial Engineering, College of Engineering and Technology, University of Dar Es Salaam, Dar es Salaam, Tanzania.
Kobe Univ, Dept Chem Sci & Engn, Kobe, Hyogo 6578501, Japan..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Glycoscience. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0001-9832-027X
2019 (English)In: ACS Sustainable Chemistry and Engineering, ISSN 2168-0485, Vol. 7, no 1, p. 1692-1697Article in journal (Refereed) Published
Abstract [en]

Chitin nanofibers are an interesting biological nanomaterial for advanced applications, for example, in medicine, electronics, packaging and water purification. The challenge is to separate chitin nanofibers from protein in the exoskeleton structure of arthropods and avoid nanofibril aggregation to realize the mechanical potential of chitin. In this work, we developed a new method for the preparation of chitin nanofibers from lobster shell exoskeleton using 10 wt % chitosan as a sacrificial polymer. The addition of chitosan in the raw chitin colloidal suspension during high pressure homogenization process at pH 3 significantly reduced the agglomeration of chitin nanofibers as revealed by dynamic light scattering and transmission electron microscopy. Chitin film prepared from the chitin nanofiber suspension by vacuum filtration exhibited a true nanofibrils network structure without fibril aggregations as characterized by scanning electron microscopy. The presence of chitosan not only improves the colloidal stability of chitin nanofibers suspension but also facilitates the formation of chitin nanofiber network structure in the film as indicated by wide-angle X-ray diffraction analysis. The chitin nanofiber film with 4 +/- 1 wt % residual chitosan showed high tensile strength (187.2 +/- 5.6 MPa) and high work of fracture (12.1 +/- 0.4 MJ/m(3)), much higher than those chitin and chitosan films reported previously in the literature.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 7, no 1, p. 1692-1697
Keywords [en]
Chitin nanofibers, Chitin film, Chitosan, Mechanical, Nanostructure
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-242987DOI: 10.1021/acssuschemeng.8b05452ISI: 000455288800179Scopus ID: 2-s2.0-85059435797OAI: oai:DiVA.org:kth-242987DiVA, id: diva2:1285768
Funder
Knut and Alice Wallenberg Foundation
Note

QC 20190205

Available from: 2019-02-05 Created: 2019-02-05 Last updated: 2019-02-05Bibliographically approved

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Mushi, Ngesa EzekielZhou, Qi

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