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Unusual fracture behavior of nanoporous polymeric thin-films

Published online by Cambridge University Press:  01 February 2011

Andrew V. Kearney ,
Reinhold H. Dauskardt ,
Carol E. Mohler  and
Michael E. Mills
Andrew V. Kearney
Affiliation:
Department of Materials Science, Stanford University, Stanford, CA 94305-2205
Reinhold H. Dauskardt
Affiliation:
Department of Materials Science, Stanford University, Stanford, CA 94305-2205
Carol E. Mohler
Affiliation:
Advanced Electronics Materials, The Dow Chemical Company, Midland, MI 48674
Michael E. Mills
Affiliation:
Advanced Electronics Materials, The Dow Chemical Company, Midland, MI 48674
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Abstract

We present surprising evidence that the fracture resistance of porous forms of poly(arylene) ether (PAE) films exhibit increasing fracture resistance with increasing porosity. Such behavior is in stark contrast to the fracture toughness of porous solids, which typically decrease markedly with increasing porosity. A fracture mechanics based model is presented to rationalize the increase in fracture toughness of the voided polymer film and explain the behavior in terms of the pore size and volume fraction. It is shown that a certain dependence of pore size and volume fraction is required to increase rather than decrease the fracture resistance. The research has implications for the optimum void size and volume fraction needed to enhance the fracture resistance of porous ductile polymer films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 880: Symposium BB – Mechanical Properties of Nanostructured Materials-Experiments and Modeling , 2005 , BB8.9
Copyright
Copyright © Materials Research Society 2005

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