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Plastic Deformation of Glassy Polymers: Correlation Between Shear Activation Volume and Entanglement Density

Published online by Cambridge University Press:  11 February 2011

Janet Ho ,
Leon Govaert  and
Marcel Utz
Janet Ho
Affiliation:
Institute of Materials Science, University of Connecticut, Storrs, CT 06269, U.S.A.
Leon Govaert
Affiliation:
Dutch Polymer Institute (DPI), Eindhoven University of Technology, Eindhoven, The Netherlands.
Marcel Utz
Affiliation:
Institute of Materials Science, University of Connecticut, Storrs, CT 06269, U.S.A.
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Abstract

The shear activation volumes of miscible polystyrene-poly(2,6-dimethyl-1,4-phenylene oxide) (PS-PPO) blends at different PS-PPO ratios were determined experimentally by both plane strain and uniaxial compression at constant strain rates. We find that the same correlation between the shear activation volume and the entanglement density ρe holds for the blend as well as for various pure glassy polymers: . Since the shear activation volume is closely related to the size of the plastic shear zones, this correlation suggests that the cooperativity of the elementary processes of plastic deformation in glassy polymers scales with the entanglement density.

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