resumo
Injectable bioglass (BG) pastes were produced using a melt-quenched glass based on CaO-MgO-SiO2-Na2O-P2O5-CaF2 and two organic carriers, namely polyethylene glycol (PEG) and glycerol (Gly). The interactions between the organic carriers and the surface of the BG particles were assessed by spectroscopic methods (Fourier Transform Infrared, Raman, as well as 29Si and 13C solid-state NMR spectroscopy) in order to understand their effects on the viscoelastic properties of the biocomposites. While pure physical interactions were detected between PEG and the surface of the BG particles, chemical bonding was observed between glycerol and BG, enhancing the network cross-linking degree. Accordingly, the BG network of Gly-BG pastes was more condensed (higher fraction of Q [3] units detected by Raman spectroscopy) in comparison to that of PEG-BG and bare BG. Such chemical interactions between the organic carrier and BG were shown to negatively affect the viscoelastic behaviour of the resulting pastes. Thus, the PEG-based biocomposite exhibited improved flowability in comparison to its analogous Gly-BG biocomposite. (C) 2016 Elsevier Ltd. All rights reserved.
palavras-chave
CAO-MGO-SIO2 SYSTEM; HYALURONIC-ACID; HYDROXYAPATITE; REGENERATION; ADDITIVES; CAF2; B2O3; NA2O; P2O5
categoria
Materials Science
autores
Gonzalo-Juan, I; Tulyaganov, DU; Balan, C; Linser, R; Ferreira, JMF; Riedel, R; Ionescu, E
nossos autores
José Maria da Fonte Ferreira
Professor(a) Jubilado(a)agradecimentos
The authors thank Dr. M. Graczyk-Zajac (TU Darmstadt, FB Material-und Geowissenschaften) for her kind help in FTIR characterization of composite materials. D. U. Tulyaganov acknowledges financial support from the German Academic Exchange Service (DAAD organization). Corneliu Balan acknowledge the financial support from the Romanina grants: PN-II-ID-PCE-2012-4-0245 and PN-II-PT-PCCA-2011-3.1-0052. Rasmus Linser acknowledges the DFG for financial support in terms of Emmy-Noether funding. This work was supported by the European Regional Development Fund (FEDER) under the PT2020 Partnership Agreement through the COMPETE, by the Portuguese Government through the Portuguese Foundation for Science and Technology (FCT), in the scope of the projects UID/CTM/50011/2013 (Aveiro Institute of Materials, CICECO,www.ciceco.ua.pt).