Study of the thermal degradation of bioactive sol–gel coatings for the optimization of its curing process
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Hernandez-Escolano_JTAC_107_499-508_2012_DOI 10.1007s10973-011-1553-2_Personal Copy.pdf (305,0Kb) (Accés restringit)
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hdl:2117/17368
Tipus de documentArticle
Data publicació2012-02
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Abstract
A set of materials has been prepared by sol–gel process containing different quantities of hydroxyapatite (0, 2.5 and 5% HAp w/w) using as silica precursors glycidyloxypropyltrimethoxysilane (GPTMS) and triethoxyvinylsilane (VTES). In order to optimize the curing process to obtain sintherized systems (inorganic network) or hybrid systems (organic–inorganic) a TG and FTIR studies have been developed and degradation kinetic triplet parameters were obtained (the activation energy, pre-exponential factor, and function of degree of conversion). The kinetic study was analyzed by means of an integral isoconversional non-isothermal procedure (model free), and the kinetic model was determined by the Coats–Redfern method and through the compensation effect (IKR). All the systems followed the n = 6 kinetic model. The addition of HAp increases the thermal stability of the systems. The isothermal degradation was simulated from non-isothermal data, and the curing process could be defined to obtain the two types of materials. Temperature under 250 °C allows the formation of hybrids networks
CitacióHernández-Escolano, M. [et al.]. Study of the thermal degradation of bioactive sol–gel coatings for the optimization of its curing process. "Journal of thermal analysis and calorimetry", Febrer 2012, vol. 107, núm. 2, p. 499-508.
ISSN1388-6150
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Hernandez-Escol ... 1-1553-2_Personal Copy.pdf | 305,0Kb | Accés restringit |