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Journal of Nanomaterials
Volume 2012 (2012), Article ID 386236, 9 pages
http://dx.doi.org/10.1155/2012/386236
Research Article

Mechanical Behavior of Nanostructured Hybrids Based on Poly(Vinyl Alcohol)/Bioactive Glass Reinforced with Functionalized Carbon Nanotubes

1Center of Nanoscience, Nanotechnology, and Innovation (CeNano) and Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais, 31270-901 Belo Horizonte, MG, Brazil
2Department of Metallurgy and Material Engineering, Centro Federal de Educação Tecnológica de Minas Gerais, Avenida Amazonas 5253, Nova Suiça, 30421-169 Belo Horizonte, MG, Brazil

Received 21 August 2012; Revised 26 October 2012; Accepted 6 November 2012

Academic Editor: Tianxi Liu

Copyright © 2012 H. S. Mansur et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study reports the synthesis and characterization of novel tridimensional porous hybrids based on PVA combined with bioactive glass and reinforced by chemically functionalized carbon nanotubes (CNT) for potential use in bone tissue engineering. The functionalization of CNT was performed by introducing carboxylic groups in multiwall nanotubes. This process aimed at enhancing the affinity of CNTs with the water-soluble PVA polymer derived by the hydrogen bonds formed among alcohol (PVA) and carboxylic groups (CNT–COOH). In the sequence, the CNT–COOH (0.25 wt%) were used as the nanostructure modifier for the hybrid system based on PVA associated with the bioactive glass (BaG). The mechanical properties of the nanostructured hybrids reinforced with CNT–COOH were evaluated by axial compression tests, and they were compared to reference hybrid. The averaged yield stresses of macroporous hybrids were (2.3 ± 0.9) and (4.4 ± 1.0) MPa for the reference and the CNT reinforced materials, respectively. Moreover, yield strain and Young's modulus were significantly enhanced by about 30% for the CNT–COOH hybrids. Hence, as far as the mechanical properties are concerned, the results have clearly showed the feasibility of utilizing these new hybrids reinforced with functionalized CNT in repairing cancellous bone tissues.