Nanotech 2010

High Strain Rate Compression Behavior of Conventional and CNF-Filled-Nanophased Glass/Polyester Composites

M.K. Hossain, M.E. Hossain, M. Hosur, S. Jeelani, V. Rangari
Tuskegee University, US

Keywords: sonication, CNF, high strain rate test, TEM, SEM

Abstract:

A high intensity ultrasonic liquid processor was used to infuse carbon nanofibers (CNFs) into polyester matrix that was then mixed with hardener using a high speed mechanical agitator. The trapped air and reaction volatiles were removed from the mixture using a high vacuum. Dispersion effect on mechanical properties of CNF/polyester was investigated performing sonication dispersion at 60, 90 and 120 minutes, respectively. Quasi-static results show the significant improvement in the dispersion of CNFs in sonication over the mechanical mixing method. Compression tests performed on the unfilled, 0.1 wt. %, 0.2 wt. %, 0.3 wt% and 0.4 wt. % CNF filled polyester, respectively, show increase in modulus and strength with increasing loading percentage of CNFs up to 0.2 wt%. The better dispersion of 0.2 wt% of CNFs into polyester matrix is observed by transmission electron microscopy (TEM). The conventional and CNFs filled glass/polyester composite laminates using 35 plies of woven E-glass were processed with vacuum assistant resin transfer molding (VARTM) and high strain rate compressive behavior of this new material system is currently being studied using a Split Hopkinson Pressure Bar (SHPB) setup results of which will be discussed in the full paper.
 
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