Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 69, Issue 11-12, Pages 1880-1886Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2009.04.005
Keywords
Polymer-matrix composites (PMCs); Nanocomposites; Interphase; Thermomechanical properties
Categories
Funding
- NIH [DE 018350]
- NASA [BI-Mat URETI NCC-1-02037]
- National Science Foundation through a graduate research fellowship
- Northwestern University through a Presidential Fellowship
- NSF-NSEC
- NSF-MRSEC
- Keck Foundation
- State of Illinois
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This paper quantifies how the quality of dispersion and the quality of the interfacial interaction between TiO2 nanoparticles and host polymer independently affect benchmark properties such as glass transition temperature (T-g), elastic modulus and loss modulus. By examining these composites with differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and scanning electron microscopy (SEM), we demonstrate changes in properties depending on the adhesive/wetting or repulsive/dewetting interactions the nanoparticles have with the bulk polymer. We further quantify the dispersion of TiO2 nanoparticles in polymethylmethacrylate (PMMA) matrices by a digital-optical method and correlate those values to the degree of T-g depression compared to neat PMMA. Samples with the same weight percent of nanoparticles but better dispersion show larger shifts in T-g. (C) 2009 Elsevier Ltd. All rights reserved.
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