Effects of Increasing Chitosan Nanofibre Volume Fraction on the Mechanical Property of Hydroxyapatite

Dare Victor Abere^1, , Grace Modupe Oyatogun², Ifeoluwa Emmanuel Akinwole², Abiodun Ayodeji Abioye³, Azeez Lawan Rominiyi⁴ and Igonwelundu Magnus T.¹

¹Department of Metal Processing and Production, National Metallurgical Development Centre, Jos, Nigeria

²Department of Materials Science and Engineering, Obafemi Awolowo University, Ile – Ife, Nigeria

³Department of Mechanical Engineering, Covenant University, Ota, Nigeria

⁴Department of Research and Development, Prototype Engineering Development Institute, Ilesa, Nigeria

Cite this paper:
Dare Victor Abere, Grace Modupe Oyatogun, Ifeoluwa Emmanuel Akinwole, Abiodun Ayodeji Abioye, Azeez Lawan Rominiyi and Igonwelundu Magnus T.. Effects of Increasing Chitosan Nanofibre Volume Fraction on the Mechanical Property of Hydroxyapatite. American Journal of Materials Science and Engineering. 2017; 5(1):6-16. doi: 10.12691/ajmse-5-1-2

Abstract

This work attempted to synthesize chitosan (CH) nanofibre from crab shell and hydroxyapatite, HA, from limestone with the objective of studying the effects of increasing volume fraction of chitosan nanofibre on the mechanical properties of HA. Mechanical characterization of different fraction composite was carried out to study the effects of increasing volume fraction of chitosan nano fibre on the mechanical properties of HA. In addition, surface characterization of the composite was carried out using Fourier Transform Infrared Spectrometry, FT-IR. Results obtained indicated that the optimum mechanical properties were obtained at a volume fractions of 30: 70, CH: HA respectively; average compressive strength of 10.12 MPa; average tensile strength of 173.9 MPa; average hardness value of 420.80 HV; average fracture toughness of 14.72 MPa.m^1/2; average elastic modulus of 0.1583 GPa and average bending strength of 157.96 MPa were obtained for this optimum volume fractions. Increasing volume fractions of chitosan nanofibre was therefore found to result in decrease in compressive strength, hardness and elastic modulus of HA while its tensile strength, bending strength and fracture toughness increased. The FTIR revealed that possible interaction between the NH₂ group and the primary and secondary –OH group of CH with Ca²⁺ (metal coordination interaction) of HA might be responsible for the higher mechanical property of HA. In conclusion, it was found that increasing chitosan volume fraction in chitosan/HA composite results in increasing strength of hydroxyapatite, consequently enhancing its load bearing ability.

Keywords:
hydroxyapatite chitosan nanofibre composite volume fraction

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