IJUP08 - Universidade do Porto

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Crises e Reformas: o colonialismo ilustrado na Capitania de São Pauloe os esforços de modernização do Governo Morgado de Mateus (1765-1755) Joana Salém Vasconcelos, Vera Lúcia Amaal Ferlini Universidade de S. Paulo, Brasil 73
Incorporation of organics/inorganics nanocomposites in coatings of high environmental and mechanical resistance J. Pimenta 1 , C. Carneiro 2 , A. Mendes 3 , J. Moniz 4 , F. Oliveira 2 , F. Magalhães 3 1 Rede de Competência em Polímeros, Porto, Portugal. 2 CIN – Corporação Industrial do Norte, S.A., Maia, Portugal 3 Department of Chemical Engineering, Faculty of Engineering, University of Porto, Portugal. 4 Resiquímica – Resinas Químicas, S.A, Lisboa, Portugal Inorganic fillers (metal oxides included) have been traditionally used in organic coatings, conferring improved mechanical and physicochemical properties. In recent years, the ability to produce inorganic fillers in nano-sized dispersible dimensions has attracted new attention over an otherwise well established field. Indeed, the performance of the inorganic-organic composites is optimized when the fillers are present in dimensions below 100 nm (nano-size). However, this is only effective if the materials are uniformly dispersed throughout the final coating film. When dealing with water based coatings, obtained from polymeric emulsions, it is important to ensure that the inorganic nanoparticles are well dispersed, either through encapsulation within the polymer particles or dispersion in the aqueous phase. The first situation may be the most desirable, since it should lead to a more uniform particle distribution in the coalesced film. One of the main motivations for this research is the development of enhanced intumescent paints (which expand when heated, creating a barrier to heat transmission and therefore protecting the substract from the high temperatures occurring during a fire [1]). Our work has been focused on incorporating nano-sized silica (SiO2) particles in vinylic emulsions. The initial approach consisted is pre-dispersing powdered nanosilica in the colloidal solution that is the starting point for the emulsion polymerization reaction. Two types of nanosilica were selected: Sil-1 (with surface treatment) and Sil-2 (without surface treatment). For Sil-1, some methods of dispersion have been studied in order to avoid suprananometric agglomeration in the aqueous phase: Cowles agitator, ultrasound and bead milling. The later gave the best results. After polymerization of the vinylic monomers, TEM microscopy indicated that there was silica present in the surrounding aqueous phase, probably stabilized by the colloid, and encapsulation by the polymer could not be confirmed due to the opacity of the polymeric particles. Concerning Sil-2, TEM analysis indicated that these nano particles tend to attach to the surface of the polymeric particles and encapsulation is improbable in this case (Fig. 1). Current work is dealing with promoting the encapsulation of Sil-1 in the polymer, by developing a colloid-free formulation, and the encapsulation of Sil-2, by using a comonomer with affinity to its surface. References: [1] – Nogueira J. L. (2006), Protecção passiva contra o fogo. Figure 1 – polymer emulsion particle surrounded by Sil-2 74
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IJUP08 - Universidade do Porto

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