Biomimetic synthesis and tensile properties of nanostructured high volume fraction hydroxyapatite and chitosan biocomposite films

Kithva, P., Grondahl, L., Martin, D. and Trau, M. (2010) Biomimetic synthesis and tensile properties of nanostructured high volume fraction hydroxyapatite and chitosan biocomposite films. Journal of Materials Chemistry, 20 2: 381-389. doi:10.1039/b914798e


Author Kithva, P.
Grondahl, L.
Martin, D.
Trau, M.
Title Biomimetic synthesis and tensile properties of nanostructured high volume fraction hydroxyapatite and chitosan biocomposite films
Journal name Journal of Materials Chemistry   Check publisher's open access policy
ISSN 0959-9428
1364-5501
Publication date 2010
Year available 2009
Sub-type Article (original research)
DOI 10.1039/b914798e
Open Access Status Not Open Access
Volume 20
Issue 2
Start page 381
End page 389
Total pages 9
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Collection year 2011
Language eng
Subject C1
0303 Macromolecular and Materials Chemistry
0904 Chemical Engineering
Formatted abstract
Chitosan-Hydroxyapatite (HA) nanostructured composite films have been prepared by solvent casting their hybrid suspensions. The synthesis of suspensions involves mediating the crystallization of HA by introducing chitosan solution into the reaction mixture. Both formaldehyde-treated chitosan and untreated chitosan solutions were used to study the effect of formaldehyde on chitosan-HA interactions and subsequent effective load transfer in biocomposites. The nanostructure and phase purity of HA (mildly carbonated HA) in the films were verified using SEM, XRD and FTIR. Tensile testing of the films showed significant increases in both the Young's modulus (E) and ultimate tensile strength (UTS) with HA content, reaching up to 17.3 GPa and 222 MPa, respectively, for films containing 66 wt.% (or 47 vol.%) HA in formaldehyde-treated chitosan films. In comparison to untreated chitosan composite films (<40 wt.% HA), formaldehyde-treated chitosan composite films resulted in higher E and UTS values, despite the observation of similar dispersion levels of HA particles. It is argued that apart from the uniform dispersion of HA particles in the chitosan matrix, the chemical binding between the constituents in the formaldehyde-treated chitosan composite films played a major role in the observed high tensile properties. ©The Royal Society of Chemistry 2010.
Keyword Nanocrystalline Hydroxyapatite
Polymer Nanocomposites
Mechanical-properties
Surface modification
Phosphonic chitosan
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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Created: Sun, 03 Jan 2010, 00:01:49 EST