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Increased fracture toughness in nanoporous silica–polyimide matrix composites

Published online by Cambridge University Press:  31 January 2011

Shiling Ruan ,
John J. Lannutti ,
Stan Prybyla  and
Robert R. Seghi
Shiling Ruan
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210
John J. Lannutti
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210
Stan Prybyla
Affiliation:
BFGoodrich Aerospace Research and Development Center, 9921 Brecksville Rd., Brecksville, Ohio 44141–3289
Robert R. Seghi
Affiliation:
College of Dentistry, The Ohio State University, Columbus, Ohio 43210
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Abstract

Silica–polyimide nanocomposites were prepared by hot-pressing mixtures of polyimide and highly porous silica powder. The silica powder was produced using a sol-gel process that generates pores as small as 15 Å. The effects of loading, cure, and post-cure temperature on fracture toughness were investigated. The addition of silica particles improved the fracture toughness from 0.5 to a maximum of 1.9 MPa m0.5. However, fracture toughness dropped at silica weight percentages ≥30%. The cure and post-curing temperatures have a strong influence on toughness; post-curing exposure ≥400 °C reduced toughness. Transmission electron microscopy examination of the fracture surfaces indicated that the toughness improvements may occur at the nanometer scale due to crack pinning and branching induced by the nanoporous silica particles.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 7 , July 2001 , pp. 1975 - 1981
Copyright
Copyright © Materials Research Society 2001

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