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Publication Citation: Mapping Heterogeneity in NanoTiO2/Polymer Coatings Using Confocal Microscopy and Depth Sensing Indentation

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Author(s): Li Piin Sung;
Title: Mapping Heterogeneity in NanoTiO2/Polymer Coatings Using Confocal Microscopy and Depth Sensing Indentation
Published: October 14, 2009
Abstract: The purpose of this study is to develop relevant metrology to measure the appropriate structure-property relationship at a proper length scale to understand the interplay between nanoparticle and polymeric matrix. In this paper, we present the preliminary results using a combination of laser scanning confocal microscopy (LSCM) and depth sensing indentation (DSI) techniques to probe and map surface/subsurface heterogeneity of the nanoparticle-filled polymeric coatings and to relate to their surface mechanical properties. Nanoparticle-polymer coating systems of different dispersion states were prepared using particle-polymer interactions in different polymer matrices. Two types of TiO2 nanoparticles (with and without surface treatment) were chosen to mix into two different polymeric matrices. The heterogeneity in surface and subsurface was characterized using LSCM. The resultant surface mechanical properties were measured by DSI using different sizes and shapes of indenter tip. The best correlation was found for nanoparticle dispersion (cluster size and distribution) and surface modulus mapping while using a pyramidal shape tip.
Conference: 239th ACS National Meeting & Exposition
Proceedings: ACS Polymeric Materials: Science and Engineering Preprints
Location: San Francisco, CA
Dates: March 21-25, 2010
Keywords: depth sensing indentation; laser scanning confocal microscopy;nanoparticle dispersion;surface modulus;TiO2
Research Areas: Building Materials, Polymers/Polymeric Composites, Building and Fire Research, Coatings/Sealants, Nanocomposite Materials
PDF version: PDF Document Click here to retrieve PDF version of paper (468KB)