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Fibers 2018, 6(4), 97; https://doi.org/10.3390/fib6040097

Chitosan as a Coupling Agent for Phosphate Glass Fibre/Polycaprolactone Composites

1
International Doctoral Innovation Centre, University of Nottingham Ningbo China, Ningbo 315100, China
2
Ningbo Nottingham New Materials Institute, University of Nottingham Ningbo China, Ningbo 315100, China
3
Composites Research Group, Healthcare Technologies, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK
4
Advanced Materials Research Group, Healthcare Technologies, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK
*
Author to whom correspondence should be addressed.
Received: 5 November 2018 / Revised: 28 November 2018 / Accepted: 30 November 2018 / Published: 10 December 2018
(This article belongs to the Special Issue Glass Fibers 2018)
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Abstract

This study shows that chitosan (CS) could be highly useful as a coupling agent in phosphate glass fibre/polycaprolactone (PGF/PCL) composites, as it improved the interfacial shear strength by up to 78%. PGFs of the composition 45P2O5–5B2O3–5Na2O–24CaO–10MgO–11Fe2O3 were dip-coated with CS (with a degree of deacetylation >80%) dissolved in acetic acid solution (2% v/v). Different CS concentrations (3–9 g L−1) and coating processes were investigated. Tensile and fragmentation tests were conducted to obtain the mechanical properties of the single fibres and interfacial properties of the PGF/PCL composites, respectively. It was observed that post-cleaning, the treated fibres had their tensile strength reduced by around 20%; however, the CS-coated fibres experienced strength increases of up to 1.1–11.5%. TGA and SEM analyses were used to confirm the presence of CS on the fibre surface. FTIR, Raman, and X-ray photoelectron spectroscopy (XPS) analyses further confirmed the presence of CS and indicated the protonation of CS amine groups. Moreover, the nitrogen spectrum of XPS demonstrated a minimum threshold of CS coating required to provide an improved interface. View Full-Text
Keywords: chitosan; coupling agent; phosphate glass fibre; polycaprolactone (PCL) composite chitosan; coupling agent; phosphate glass fibre; polycaprolactone (PCL) composite
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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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Tan, C.; Rudd, C.; Parsons, A.; Sharmin, N.; Zhang, J.; Chen, W.; Ahmed, I. Chitosan as a Coupling Agent for Phosphate Glass Fibre/Polycaprolactone Composites. Fibers 2018, 6, 97.

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