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J. Compos. Sci. 2017, 1(1), 9; doi:10.3390/jcs1010009

A Comparative Analysis of the Reinforcing Efficiency of Silsesquioxane Nanoparticles versus Apatite Nanoparticles in Chitosan Biocomposite Fibres

1
Department of Chemical Engineering, The Petroleum Institute, Abu Dhabi, P.O. Box 2533, United Arab Emirates
2
School of Engineering, Level 4, Building 5, Monash University Malaysia, Jalan Lagoon Selatan, 47500, Bandar Sunway, Selangor Darul Ehsan, Malaysia
3
SLINTEC (Pvt) Limited, Sri Lanka Institute of Nanotechnology, Nanotechnology & Science Park, Mahenwatte, Pitipana, Homagama, Sri Lanka
4
Faculty of Science, Agriculture and Engineering, Devonshire Building, Newcastle University, NE1 7RU, UK
5
Newcastle University Singapore, SIT Building @ Nanyang Polytechnic, 172A Ang Mo Kio Avenue 8, #05-01, Singapore 567739, Singapore
*
Author to whom correspondence should be addressed.
Received: 23 June 2017 / Revised: 1 August 2017 / Accepted: 14 August 2017 / Published: 18 August 2017
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Abstract

A comparative analysis of the effects of polyhedral oligomeric silsesquioxane (POSS) and hydroxyapatite (HA) for reinforcing chitosan (CS) is given here. Wet-spun CS nanocomposite fibres, blended with HA or POSS nanoparticles, at varying concentrations ranging from 1 to 9% (w/w) were stretched until rupture to determine the mechanical properties related to the elasticity (yield strength and strain, stiffness, resilience energy) and fracture (fracture strength strain and toughness) of the composite. Two-factor analysis of variance of the data concluded that only the fracture-related properties were sensitive to interaction effects between the particle type and concentration. When particle type is considered, the stiffness and yield strength of CS/POSS fibres are higher than CS/HA fibres—the converse holds for yield strain, extensibility and fracture toughness. With regards to sensitivity to particle concentration, stiffness and yield strength reveal trending increase to a peak value (the optimal particle concentration associated with the critical aggregation) and trending decrease thereafter, with increasing particle concentration. Although fracture strength, strain at fracture and fracture toughness are also sensitive to particle concentration, no apparent trending increase/decrease is sustained over the particle concentration range investigated here. This simple study provides further understanding into the mechanics of particle-reinforced composites—the insights derived here concerning the optimized mechanical properties of chitosan composite fibre may be further developed to permit us to tune the mechanical properties to suit the biomedical engineering application. View Full-Text
Keywords: hydroxyapatite; polyhedral oligomeric silsesquioxanes; elasticity; fracture; particle shape; particle concentration; Weibull model hydroxyapatite; polyhedral oligomeric silsesquioxanes; elasticity; fracture; particle shape; particle concentration; Weibull model
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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. (CC BY 4.0).

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MDPI and ACS Style

Wang, K.; Pasbakhsh, P.; De Silva, R.T.; Goh, K.L. A Comparative Analysis of the Reinforcing Efficiency of Silsesquioxane Nanoparticles versus Apatite Nanoparticles in Chitosan Biocomposite Fibres. J. Compos. Sci. 2017, 1, 9.

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