Centro da Tecnologia da Informacao Renato Archer CTI

Campinas, Brazil

Centro da Tecnologia da Informacao Renato Archer CTI

Campinas, Brazil
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Bandeira L.C.,University of Franca | De Campos B.M.,University of Franca | Ciuffi K.J.,University of Franca | Nassar E.J.,University of Franca | And 3 more authors.
Journal of the Brazilian Chemical Society | Year: 2017

Additive manufacture is an effective technology to produce complex macrostructures from polymers. Sol-gel is a chemical process that affords multifunctional materials by functionalization of different substrates. This work reports on the use of acrylonitrile-butadiene-styrene polymer (ABS) as starting material to obtain a substrate by additive manufacture. Coating of ABS by the sol-gel methodology generated a multifunctional material. Sols with and without phosphate ions were prepared from silicon and calcium alkoxide. Based on X-ray diffraction patterns, a calcium phosphate crystalline structure emerged on ABS after contact of the substrate with simulated body fluid. Infrared analysis revealed that the peaks of the functionalized substrate shifted, indicating that ABS interacted with the sol-gel coating. According to thermal analysis, the maximum decomposition temperature of the coated samples was 20°C higher as compared to non-coated ABS. Sol-gel and additive manufacture are important technologies to produce materials with applications in biological medium. ©2017 Sociedade Brasileira de Química.


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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