Nano Particle Control of Void Formation and Expansion in Polymeric and Composite Systems
Final rept. 15 Apr 2007-28 Feb 2009
GLOBAL NETWORK CORP SEATTLE WA
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Carbon fiber reinforced plastic CFRP structures are more and more utilized in high tech applications and especially in aviation due to their low weight and relatively high strength and stiffness. Introduction of porosity in the matrix resin system can achieve further reduction in weight while maintaining or improving properties and ultimate performance. This porosity can be achieved by using epoxy foams. Epoxy foam matrices are known to have many advantages such as high adherent strength, low water adsorption, good dimensional stability, heat resistance, and resistance to chemicals, in addition to impact improvements. Moreover, a particular advantage of epoxy foams is their tendency to inhibit crack propagation in composite materials. In this work, an effort to study process, mechanical, and morphological properties of foam matrices from the macro, micro, and nano perspective has been made. Foam evaluation to achieve higher toughness and inhibit crack propagation was investigated first by adding foaming agents such as styrene oxide during the curing process of epoxy based matrices, and second by introducing montmorillonite clays internally on the void surface of polyurethane foams. Finally, the effect of pressure during cure, independent of temperature, as a novel foaming process manufacturing technique, was also investigated and evaluated through differential scanning calorimetry and dynamic mechanical analysis.
- Physical Chemistry
- Polymer Chemistry