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Correlating Nanoparticle Dispersion to Surface Mechanical Properties of TiO2/Polymer Composites



Yongyan Pang


The main objectives of this study are to characterize the nanoparticle dispersion in polymeric matrices with different mixing chemistry conditions; and to correlate dispersion to surface mechanical properties of the nanopaticle-polymer system. Two types of TiO2 nanoparticles (with and without surface treatment) were chosen to mix in two polymeric matrices of different chemistries: water-borne butyl-acrylic styrene latex coating (Latex) and solvent-borne acrylic urethane (AU). Nanoparticle dispersion (cluster size and spatial distribution) was characterized using laser scanning confocal microscopy (LSCM). Overall, Particle A (without surface treatment) dispersed better than Particle B (with organic dispersant) in both systems and the Particle A/AU system exhibited the best dispersion state. Surface mechanical properties, such as hardness and Young s modulus at micron and sub-micron length scales were determined from depth sensing indentation. The surface mechanical properties were strongly affected by the dispersion of nanoparticle clusters, and a good correlation was found between locations of the clusters near surface and the modulus-depth mapping.
Proceedings Title
MRS fall 2009
Conference Dates
November 30-December 4, 2009
Conference Location
Boston, MA
Conference Title
Materials Research Society 2009


Dispersion, surface mechanical properties, confocal, indentation, coating, TiO2


Pang, Y. (2009), Correlating Nanoparticle Dispersion to Surface Mechanical Properties of TiO2/Polymer Composites, MRS fall 2009, Boston, MA (Accessed May 21, 2024)


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Created November 25, 2009, Updated February 19, 2017