Response of Silica-Nylon6 Nanocomposites to Static and Dynamic Loading

Abstract:

Silica-nylon6 composites were fabricated using two types of silica nanoparticle fillers with different surface modifications. Type A particles (treated with hexamethyldisilazane) were uniformly dispersed but only displayed weak long-range interaction with the nylon6 matrix; in contrast, type B particles (modified with 3-aminopropyltriethoxysilane) formed covalent bonds with the nylon6 chains but their dispersion is not good. The silica-nylon6 composites synthesized were subjected to quasi-static and dynamic tension to study the effects of strain rate and nanoparticle fraction. Results show that compared to quasi-static loading, both pure nylon6 and the composites exhibit a higher strength but lower ductility under dynamic loading. With respect to the influence of the nanoparticles, both particle types cause an increase in the elastic modulus and tensile strength. The effect of the two particles on ductility differs – particle A reduces ductility, while particle B decreases ductility under quasi-static loading but enhances it noticeably for dynamic loading. Particle B enhances the mechanical properties more significantly, especially in terms of ductility. These results suggest that ensuring strong particle-matrix bonding is more crucial than good particle dispersion.

• Periodical: Materials Science Forum (Volumes 706-709)
• Pages: 786-792
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.706-709.786
• Online since: January 2012
• Authors: V.P.W. Shim, Y.B. Guo, H. W. Gu, Xu Li
• Keywords: Dynamic, SHTB, Silica-Nylon6 Nanocomposite, Surface Modification

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