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Comparison of quasistatic to impact mechanical properties of multiwall carbon nanotube/polycarbonate composites

Published online by Cambridge University Press:  31 January 2011

Paul A. Brühwiler*
Affiliation:
Empa, Swiss Federal Laboratories for Materials Testing and Research, CH-9014 St. Gallen, Switzerland; and Department of Physics and Materials Science, Uppsala University, SE-751 21 Uppsala, Sweden
Adly Necola
Affiliation:
Empa, CH-8600 Dübendorf, Switzerland
Doug J. Kohls
Affiliation:
Department of Chemical and Materials Engineering, University of Cincinnati, Cincinnati, Ohio 45221-0012
Oliver Bunk
Affiliation:
Paul Scherrer Institute, Swiss Light Source, CH-5232 Villigen PSI, Switzerland
Dale W. Schaefer*
Affiliation:
Department of Chemical and Materials Engineering, University of Cincinnati, Cincinnati, Ohio 45221-0012
Petra Pötschke
Affiliation:
Leibniz Institute of Polymer Research Dresden, Department of Polymer Reactions and Blends, D-01069 Dresden, Germany
*
a)Address all correspondence to this author. e-mail: Paul.Bruehwiler@empa.ch
b)This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/publications/JMR/policy.html
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Abstract

We report the quasistatic tensile and impact penetration properties (falling dart test) of injection-molded polycarbonate samples, as a function of multiwall carbon nanotube (MWNT) concentration (0.0–2.5%). The MWNT were incorporated by dilution of a commercial MWNT/polycarbonate masterbatch. The stiffness and quasistatic yield strength of the composites increased approximately linearly with MWNT concentration in all measurements. The energy absorbed in fracture was, however, a negative function of the MWNT concentration, and exhibited different dependencies in quasistatic and impact tests. Small-angle x-ray scattering (SAXS) showed that the dispersion of the MWNT was similar at all concentrations. The negative effects on energy absorption are attributed to agglomerates remaining in the samples, which were observed in optical microscopy and SAXS. Overall, there was a good correspondence between static and dynamic energy absorption.

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Articles
Copyright
Copyright © Materials Research Society 2010

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References

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