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Issue 7, 2011
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Improvement of the wet tensile properties of nanostructured hydroxyapatite and chitosan biocomposite films through hydrophobic modification

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Abstract

Hydrophobic modification of chitosan/hydroxyapatite composites and chitosan films was performed using four n-alkyl acids with varying alkyl chain lengths (6 to 16 carbons), and these films were characterized for their hydrophobicity and tensile properties under wet conditions. Grafting was performed by a heterogeneous reaction in a 2.0 mol L−1DMF solution of the acid at 80 °C for either one or five days. Characterisation by Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) verified the introduction of amide functionalities and alkyl chains. The degree of substitution (DS) ranged from 2–5% for the composite films (based on XPS N 1s narrow scans) reflecting the heterogeneous nature of the reaction. Water contact angle measurements and the tensile testing under wet conditions showed, in general, that the grafting time and alkyl chain length had little effect on the surface hydrophobicity and the tensile properties of films, respectively. However, these modifications had a pronounced effect on decreasing the water content of the films, suggesting that the grafting had occurred in the bulk of the film for longer grafting times. In contrast, the tensile properties of the grafted composite films were significantly improved relative to non-grafted films and a modulus of 393 ± 68 MPa and an UTS of 18.7 ± 1.5 MPa were reached for composite films grafted for one day. This study provides a simple method to improve the wet tensile properties of chitosan/hydroxyapatite composite films making them more suitable for biomedical applications.

Graphical abstract: Improvement of the wet tensile properties of nanostructured hydroxyapatite and chitosan biocomposite films through hydrophobic modification

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Publication details

The article was received on 14 Sep 2010, accepted on 19 Nov 2010 and first published on 20 Dec 2010


Article type: Paper
DOI: 10.1039/C0JM03080E
Citation: J. Mater. Chem., 2011,21, 2330-2337
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    Improvement of the wet tensile properties of nanostructured hydroxyapatite and chitosan biocomposite films through hydrophobic modification

    C. Pradal, P. Kithva, D. Martin, M. Trau and L. Grøndahl, J. Mater. Chem., 2011, 21, 2330
    DOI: 10.1039/C0JM03080E

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