Abstract
Polymeric coatings were obtained polycaprolactone-chitosan. The coatings were applied by dip-coating technique, on Ti6Al4V substrates chemically treated with NaOH solution. Based on SEM morphological analysis and infrared spectra, it was observed that the amount of polycaprolactone in the coating obtained had an effect in retaining the chitosan on the surface, associated with the emission of R-OH bond and the morphological characteristics. Impedance spectra performed on the polymeric films showed phenomena related processes adsorption of ionic species to monolayer formation on the surface. These spectra showed equally charge transfer phenomena generated by the morphological characteristics of the coatings, such as its porosity, density and homogeneity. The coated substrate was immersing in SBF solution for 8 days, allowed to observe its adsorption capacity of calcium through nucleation and precipitation of calcium phosphates, bioactive character displaying a front medium.
Highlights
El titanio y sus aleaciones son por excelencia los biomateriales metálicos más empleados para la sustitución y regeneración de tejidos óseos, debido a sus excelentes propiedades; sin embargo, una elevada resistencia a la corrosión le confiere una inercia química al titanio que no permite una adecuada interacción con el medio biológico, dificultando el proceso de osteointegración (Bronzino, 2000)
Las soluciones individuales de PCL y quitosano fueron mezcladas manteniendo una relación volumétrica PCL/Quitosano de 10/3 a 1000 rpm durante 1 hora, hasta obtener soluciones estables (Reddy, 2011)
Las superficies recubiertas se mantuvieron inmersas en el fluido simulado durante 8 días, manteniendo unas condiciones de temperatura constante de 36,5 °C
Summary
Los tratamientos con soluciones fisiológicas y los recubrimientos fueron realizados sobre muestras cilíndricas de Ti6Al4V de 14 mm de diámetro y 2 mm de altura. Para la obtención de los recubrimientos biopoliméricos se utilizó quitosano con 85% de desacetilación y policaprolactona (PCL) marca Sigma-Aldrich, con una masa molecular promedio (Mn) de 80.000
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