The influence of coupling agents on mechanical property retention and long-term cytocompatibility of phosphate glass fibre reinforced PLA composites

Hasan, Mohammad S.; Ahmed, Ifty; Parsons, Andrew J.; Walker, Gavin S.; Scotchford, Colin A.

doi:10.1016/j.jmbbm.2013.07.014

Cited by 36 publications

(23 citation statements)

References 54 publications

(90 reference statements)

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“…It is known that interfacial bonding determined both the initial mechanical properties as well as the degradation term of PGF reinforced composites [22] [24]. An important issue is how well the fibres are bonded to the matrices.…”

Section: Wetting Of Pgf By Nano-ha/pla Matricesmentioning

confidence: 99%

“…Parsons et al reported that by manipulating the contents and structure/alignments of phosphate glass fibres, the initial mechanical properties of PGF/PLA composites were optimized, with the highest initial flexural strengths and modulus reaching 350 MPa and 30 GPa, respectively [19] [20]. The mechanical properties, as well as their retention against degradation, were further improved by surface treatment on PGF with coupling agents [20] [21] [22] [23] or surface roughening [24] [25]. Plates, rods and screws of these PGF reinforced composites were fabricated by compression moulding and forging processes [26] [27], demonstrating the excellent processing ability of PGF in biodegradable composites for biomedical application.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Composites of Phosphate Glass Fibre/Nano-Hydroxyapatite/Polylactide: Effects of Nano-Hydroxyapatite on Mechanical Properties and Degradation Behaviour

He¹,

Zhu²,

Wu³

et al. 2018

MSCE

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Hydroxyapatite/polylactide (HA/PLA) composites have been intensively investigated for their potential as biodegradable fixation devices to heal bone fractures. However, most of these composites failed to achieve a bone-mimicking level of mechanical properties, which is an essential demand of the targeted application. In this study, the nano-hydroxyapatite/polylactide composites were used as the matrix and continuous phosphate glass fibres (PGF) served as the major reinforcement to obtain the nano-HA/PGF/PLA hybrid composites. While the PGF volume fraction remained constant (25%), the nano-HA content (in weight) varied from 0% to 20%. As nano-HA loading increased, the flexural modulus of the composites increased from 8.70 ± 0.35 GPa to 14.97 ± 1.30 GPa, and the flexural strengths were enhanced from 236.31 ± 10.83 MPa to 310.55 ± 22.88 MPa. However, it is found that the degradation rates are higher with more nano-HA loaded. Enhanced water absorption ability, as well as increased voids in the composites is possible reasons for the accelerated degradation of composites with higher nano-HA loading. The hybrid composites possess mechanical properties that are superior to most of the HA/PLA composites in previous research while maintaining the biodegradability. With a proper loading of nano-HA in composites of 10 weight percent, the composites are also found with improved mechanical properties without catastrophic degradation. The composites developed in this study have great potential as biodegradable bone fixation device with enhanced load-bearing ability as confirmed and superior bioactivity as anticipated.

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Section: Wetting Of Pgf By Nano-ha/pla Matricesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hybrid Composites of Phosphate Glass Fibre/Nano-Hydroxyapatite/Polylactide: Effects of Nano-Hydroxyapatite on Mechanical Properties and Degradation Behaviour

He¹,

Zhu²,

Wu³

et al. 2018

MSCE

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“…There is also a large body of work around the use of chemical surface modifiers to improve the fiber/matrix interface, but this has also been of limited success …”

Section: Introductionmentioning

confidence: 99%

“…There is also a large body of work around the use of chemical surface modifiers to improve the fiber/matrix interface, but this has also been of limited success. [15][16][17] Thermal annealing of the PGF has shown promise, whereby the residual stresses are relieved. This reduces the stress-driven hydrolysis and smoothes the tension/compression profile across the fiber.…”

Section: Introductionmentioning

confidence: 99%

Improved phosphate‐based glass fiber performance achieved through acid etch/polydopamine treatment

Parsons

Felfel

Wadge

et al. 2019

Int J of Appl Glass Sci

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Phosphate‐based glass fibers (PGF) are of interest as reinforcements for degradable implants, but have seen limited application due to their rapid loss of strength when subjected to aqueous conditions. Previous studies have utilized heat treatments to improve longer term strength retention at a significant cost to initial strength. In this study, acid etching is used to recover the initial fiber strength after heat treatment and a subsequent coating of polydopamine is applied to provide longer term retention of this recovered strength. After an initial loss of strength after heat treatment (1135 ‐> 509 MPa), an optimized combination of acid treatment and polydopamine coating was able to recover to approximately 85% of the initial strength (969 MPa). The result was significant in comparison to acid treatment (647 MPa) or coating (688 MPa) alone. The combined acid/coating treatment was demonstrated to maintain fiber properties for at least 14 days, although the amount of polydopamine coating was observed to decrease over this period. The approach reported here is of importance as it offers the required step change in degradation performance that is needed for PGF‐reinforced degradable composites.

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“…The reinforcement of resins with short or long fibres has multiple applications in various biomedical fields, especially in medicine [3] and dentistry [4]. However, the application of polymer composites, such as PGF/PCL, is limited by the rapid loss of their strength profiles after exposure to an aqueous physiological environment, which has been suggested to be due to loss of their interfacial properties [5]. Recently, coupling agents have been explored to enhance the interfacial properties of fibre/polymer composites [6,7].…”

Section: Introductionmentioning

confidence: 99%

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

Tan

Rudd

Parsons

et al. 2018

Fibers

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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.

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The influence of coupling agents on mechanical property retention and long-term cytocompatibility of phosphate glass fibre reinforced PLA composites

Cited by 36 publications

References 54 publications

Hybrid Composites of Phosphate Glass Fibre/Nano-Hydroxyapatite/Polylactide: Effects of Nano-Hydroxyapatite on Mechanical Properties and Degradation Behaviour

Hybrid Composites of Phosphate Glass Fibre/Nano-Hydroxyapatite/Polylactide: Effects of Nano-Hydroxyapatite on Mechanical Properties and Degradation Behaviour

Improved phosphate‐based glass fiber performance achieved through acid etch/polydopamine treatment

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

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