SAXS studies of nanosilica/polyurethane composites.

PERUZZO, P.J.; PARDINI, O.R.; AMALVY, J.I.

Activity Report 2007 ? Brazilian Synchrotron Light Laboratory

Editora Cubo

Año: 2008 p. 1 - 2

1518-0204

Waterborne polyurethane (PU) dispersions are raw materials for the production of environmentally friendly paints and coatings with a wide spectrum of applications. Polymer nanocomposites materials prepared using nanosilica fillers have unusual properties and in these materials the polymer chains are confined to nanoscale dimensions (1-10 nm). The incorporation of nanosilica to PU can lead to films with improve properties like increased indentation hardness, higher strengths and elongation at break. These materials are useful as tough, abrasion-resistant coatings with increasing friction coefficient and reduced tackiness, with no change in gloss. However the improvements can only be made if the inorganic silica particles in the polymer matrix are dispersed homogeneously. In this work, the synthesis of nanosilica/ polyurethane (IPDI/PPG 1000) composites using different preparative methods and with different filler content (5, 10 and 15 wt:%) of colloidal nanosilica (Bindzil R° CC40, 12 nm diameter) is presented. Films prepared from dispersions were studied by SAXS. TEM results are also presented and discussed.