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

Published online by Cambridge University Press:  31 January 2011

Yongyan Pang ,
Stephanie S. Watson ,
Aaron M. Forster  and
Lipiin Sung
Yongyan Pang
Affiliation:
yongyan.pang@nist.govpangyongy@hotmail.com, National Institute of Standards and Technology, Building and Fire Research Laboratory, Gaithersburg, Maryland, United States
Stephanie S. Watson
Affiliation:
stephanie.watson@nist.gov, National Institute of Standards and Technology, Building and Fire Research Laboratory, Gaithersburg, Maryland, United States
Aaron M. Forster
Affiliation:
aaron.forster@nist.gov, National Institute of Standards and Technology, Building and Fire Research Laboratory, Gaithersburg, Maryland, United States
Lipiin Sung
Affiliation:
li-piin.sung@nist.gov, National Institute of Standards and Technology, Building and Fire Research Laboratory, Gaithersburg, Maryland, United States
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Abstract

The objective of this study is to characterize the nanoparticle dispersion and to investigate its effect on the surface mechanical properties of nanoparticle-polymer systems. Two types of TiO2 nanoparticles were chosen to mix in two polymeric matrices: solvent-borne acrylic urethane (AU) and water-borne butyl-acrylic styrene latex (latex) coatings. Nanoparticle dispersion was characterized using laser scanning confocal microscopy. Overall, Particle A (PA, without surface treatment) dispersed better than Particle B (PB, organic treatment) in both systems. The AU-PA system exhibited the best dispersion of the four systems, however PB forms big clusters in both of the matrices. Surface mechanical properties, such as surface modulus at micron and sub-micron length scales were determined from depth sensing indentation equipped with a pyramidal tip or a conical tip. The surface mechanical properties were strongly affected by the dispersion of nanoparticle clusters, and a good correlation was found between dispersion of nanoparticle clusters near surface and the modulus-depth mapping using a pyramid tip.

Keywords

polymernano-indentationmicrostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1224: Symposia FF/GG – Mechanical Behavior at Small Scales — Experiments and Modeling , 2009 , 1224-FF10-16
Copyright
Copyright © Materials Research Society 2010

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