Zirconium Tungstate/Epoxy Nanocomposites: Effect of Nanoparticle Morphology and Negative Thermal Expansivity

TitleZirconium Tungstate/Epoxy Nanocomposites: Effect of Nanoparticle Morphology and Negative Thermal Expansivity
Publication TypeJournal Article
Year of Publication2013
AuthorsWu HC, Rogalski M, Kessler MR
Journal TitleACS Applied Materials & Interfaces
Date Published10
Type of ArticleArticle
ISBN Number1944-8244
Accession NumberWOS:000326356600032
Keywordsbehavior, carbon nanotube/epoxy composites, coefficient, cyanate, dielectric properties, DIELECTRIC-PROPERTIES, epoxy nanocomposites, ester composites, fumed silica, glass-transition temperature, mechanical-properties, negative thermal expansion, Polymer-matrix composites (PMCs), thermo-mechanical properties, zirconium tungstate nanoparticle, zrw2o8

The ability to tailor the coefficient of thermal expansion (CTE) of a polymer is essential for mitigating thermal residual stress and reducing microcracks caused by CTE mismatch of different components in electronic applications. This work studies the effect of morphology and thermal expansivity of zirconium tungstate nanoparticles on the rheological, thermo-mechanical, dynamic-mechanical, and dielectric properties of ZrW2O8/epoxy nanocomposites. Three types of ZrW2O8 nanoparticles were synthesized under different hydrothermal conditions and their distinct properties were characterized, including morphology, particle size, aspect ratio, surface area, and CTE. Nanoparticles with a smaller particle size and larger surface area led to a more significant reduction in gel-time and glass transition temperature of the epoxy nanocomposites, while a higher initial viscosity and significant shear thinning behavior was found in prepolymer suspensions containing ZrW2O8 with larger particle sizes and aspect ratios. The thermo- and dynamic-mechanical properties of epoxy-based nanocomposites improved with increasing loadings of the three types of ZrW2O8 nanoparticles. In addition, the introduced ZrW2O8 nanoparticles did not negatively affect the dielectric constant or the breakdown strength of the epoxy resin, suggesting potential applications of ZrW2O8/epoxy nanocomposites in the microelectronic insulation industry.

URL<Go to ISI>://WOS:000326356600032