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The Influence of Hydroxyapatite Crystals on the Viscoelastic Behavior of Poly(vinyl alcohol) Braid Systems
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Resumo(s)
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.
Descrição
Funding Information: This research was funded by the Portuguese Foundation for Science and Technology (FCT), grant numbers PTDC/EME-SIS/28225/2017 and UID/EEA/04436/2019. The first author and the corresponding author are grateful to FCT for the conceded financial support. M.F.S.M. de Moura acknowledges the “Laboratório Associado de Energia, Transportes e Aeronáutica (LAETA)” for the financial support. Publisher Copyright: © 2024 by the authors.
Palavras-chave
braided composites dynamic mechanical analysis hydroxyapatite mechanical characterization poly(vinyl) alcohol viscoelasticity Biotechnology Bioengineering Biomaterials Biochemistry Biomedical Engineering Molecular Medicine