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Nanoindentation of Amorphous and Nanostructured Polymers

Published online by Cambridge University Press:  10 February 2011

Kyle C. Maner ,
Matthew R. Begley  and
Marcel Utz
Kyle C. Maner
Affiliation:
Structural and Solid Mechanics Program, Department of Civil Engineering University of Virginia, Charlottesville, VA 22904
Matthew R. Begley
Affiliation:
Structural and Solid Mechanics Program, Department of Civil Engineering University of Virginia, Charlottesville, VA 22904
Marcel Utz
Affiliation:
Department of Physics and Institute for Materials ScienceUniversity of Connecticut, Storrs, CT 06269
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Abstract

We present a detailed nanoindentation study of micron-scale thin films of polystyrene (PS), poly(phenylene oxide) (PPO), poly(methyl methacrylate) (PMMA), a metal-centered PMMA-Ruthenium block copolymer, and a PS-poly(ethylene-propylene) (PS-PEP) block copolymer with lamellar morphology. The results show that size-dependence is most readily noticeable for the lamellar PS-PEP film, indicating that the nanoidentation approach has sufficient sensitivity to capture scale dependence on scales in the range of tens of nanometers. The less pronounced scale-dependence (or lack thereof) in the other films is discussed in the context of identifying the physical length-scale of elementary processes of plastic deformation. The results indicate that the upper limit on the size of plastic shear zones in amorphous polymers is approximately 1200-9600 nm3 (i.e. a sphere with a diameter in the range of 20-40 nm).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 778: Symposium U – Mechanical Properties Derived from Nanostructuring Materials , 2003 , U5.4
Copyright
Copyright © Materials Research Society 2002

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References

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