Friday, December 5 2008 3:00 – 4:00 pm
Room 610, M&M Building
Prof. Jon J. Kellar, Chair
Department of Materials and Metallurgical Engineering
South Dakota School of Mines and Technology
Rapid City, SD 57701-3995
There are many industrial applications where dimensionally stable materials arerequired. Applications include aerospace, catalysis/combustion, optics andelectronics. Candidate materials for fabrication of dimensionally stable materialsare reviewed and a composite system is studied in detail. Toward this end, themodel system studied consisted of a lightweight polymer matrix and ceramicparticulate filler. The polymer used for this study was a cyanate ester resin. Thefiller utilized was zirconium tungstate (ZrW2O8) prepared by two differentsyntheses (sol-gel and inverse-micelle). The latter synthesis resulted inparticulate filler largely in the form of rectangular rods that were ~3-4 microns longand had a thickness of 0.3 microns. Next, composite samples were prepared, andthe coefficient of thermal expansion property measured. It was found that thecomposite CTE was 70% less than the neat polymer. Compounding methods willbe reported as well as the measured data showing the effects of size and shape inrelation to the coefficient of thermal expansion. The goal of this research is todevelop a lightweight polymer matrix composite exhibiting near zero expansionbetween -100 and 100 °C.