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| Azevedo, Nuno Monteiro |
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Zille, A.
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Publications (9/9 displayed)
- 2024The Influence of Hydroxyapatite Crystals on the Viscoelastic Behavior of Poly(vinyl alcohol) Braid Systemscitations
- 2023Halochromic Silk Fabric as a Reversible pH-Sensor Based on a Novel 2-Aminoimidazole Azo Dyecitations
- 2023Synergistic Antimicrobial Activity of Silver Nanoparticles with an Emergent Class of Azoimidazolescitations
- 2022Active Neutralizing Mats for Corrosive Chemical Storage
- 2019Comfort and Infection Control of Chitosan-impregnated Cotton Gauze as Wound Dressingcitations
- 2018Characterization of functional single jersey knitted fabrics using non-conventional yarns for sportswearcitations
- 2017Coated chitosan onto gauze to efficient conditions for maintenance of the wound microenvironmentcitations
- 2017Dielectric relaxation of near-percolated carbon nanofiber polypropylene compositescitations
- 2014Properties and controlled release of chitosan microencapsulated limonene oilcitations
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article
The Influence of Hydroxyapatite Crystals on the Viscoelastic Behavior of Poly(vinyl alcohol) Braid Systems
Abstract
Composites of poly(vinyl alcohol) (PVA) in the shape of braids, in combination with crystals of hydroxyapatite (HAp), were analyzed to perceive the influence of this bioceramic on both the quasi-static and viscoelastic behavior under tensile loading. Analyses involving energy-dispersive X-ray spectroscopy (EDS) and scanning electron microscopy (SEM) allowed us to conclude that the production of a homogeneous layer of HAp on the braiding surface and the calcium/phosphate atomic ratio were comparable to those of natural bone. The maximum degradation temperature established by thermogravimetric analysis (TGA) showed a modest decrease with the addition of HAp. By adding HAp to PVA braids, an increase in the glass transition temperature (Tg) is noticed, as demonstrated by dynamic mechanical analysis (DMA) and differential thermal analysis (DTA). The PVA/HAp composite braids' peaks were validated by Fourier transform infrared (FTIR) spectroscopy to be in good agreement with common PVA and HAp patterns. PVA/HAp braids, a solution often used in the textile industry, showed superior overall mechanical characteristics in monotonic tensile tests. Creep and relaxation testing showed that adding HAp to the eight and six-braided yarn architectures was beneficial. By exhibiting good mechanical performance and most likely increased biological qualities that accompany conventional care for bone applications in the fracture healing field, particularly multifragmentary ones, these arrangements can be applied as a fibrous fixation system.