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de Campos B.M.,University of Franca | Bandeira L.C.,University of Franca | Calefi P.S.,University of Franca | Ciuffi K.J.,University of Franca | And 4 more authors.
Virtual and Physical Prototyping | Year: 2011

The application of thin films as coating on several surfaces has been one of the major factors responsible for technological advances. Additive Manufacturing is used to define a set of technologies that have the building of 3D physic prototypes as a common characteristic. In this work we have studied the properties of Polyamide 12 samples obtained by rapid prototyping after coating with different metal transitions by sol-gel methodology. The sols were prepared with silicon, vanadium, titanium, or aluminum alkoxide. Thermal analysis revealed an increase in the decomposition temperature of the materials, which was attributed to the coating. Differences in the morphology of the films were detected by scanning electron microscopy, which depended on sol composition. The Raman spectra confirmed interaction between the coating and nylon substrate. The prepared materials exhibited new properties, such as higher thermal stability, while maintaining its initial characteristics, like low density, thereby promoting new potential applications. © 2011 Taylor & Francis.

Bandeira L.C.,University of Franca | Ciuffi K.J.,University of Franca | Calefi P.S.,University of Franca | Nassar E.J.,University of Franca | And 5 more authors.
Journal of the Brazilian Chemical Society | Year: 2012

A new type of material from polyamide coated with calcium phosphate was developed aiming to have potential application as biomaterial. Coating was obtained by the sol-gel method and calcium phosphate was obtained after contact with body fluid solution. The coated polyamide (before and after contact with body fluid solution) was characterized by thermogravimetric and differential thermal (TGA/DTA) analyses, differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). These characterizations revealed that the calcium phosphate coating has a thickness of less than 3 μm, which resulted in an increase in the melting point and improved the thermal stability of polyamide. After contact with body fluid, the interactions between the coating and the substrate remained, and there was formation of crystalline and amorphous phosphates on polyamide surface. © 2012 Sociedade Brasileira de Química.

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