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Plastic deformation of glassy polymers: correlation between shear activation volume and entanglement density

Plastic deformation of glassy polymers: correlation between shear activation volume and entanglement density
Plastic deformation of glassy polymers: correlation between shear activation volume and entanglement density
The structural relaxation caused by the plastic deformation of polymer glasses is not yet fully understood. In particular, the size scale of the localized plastic relaxation events is currently unknown. In this work, the effect of molecular entanglement density on the shear activation volume of glassy polymers has been studied. The shear activation volumes of miscible polystyrene?poly(2,6-dimethyl-1,4-phenylene oxide) (PS?PPO) blends at different PS/PPO ratios have been 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 ?e holds for the blend as well as for various pure glassy polymers:? = C(?e/nm-3)? + V0, with C = 8.2 ± 0.4 nm3, ? = 0.6 ± 0.03, and V0 < 0.1 nm3. The shear activation volume is closely related to the size of the plastic shear zones; therefore, this correlation suggests that the cooperativity of the elementary processes of plastic deformation in glassy polymers scales with ?e.
7398-7404
Ho, Janet
74e16431-3c3e-4e20-b91d-d0d76ae92544
Govaert, Leon
263b7e27-f5c9-4808-9230-e4cf8f372c30
Utz, Marcel
c84ed64c-9e89-4051-af39-d401e423891b
Ho, Janet
74e16431-3c3e-4e20-b91d-d0d76ae92544
Govaert, Leon
263b7e27-f5c9-4808-9230-e4cf8f372c30
Utz, Marcel
c84ed64c-9e89-4051-af39-d401e423891b

Ho, Janet, Govaert, Leon and Utz, Marcel (2003) Plastic deformation of glassy polymers: correlation between shear activation volume and entanglement density. Macromolecules, 36 (19), 7398-7404. (doi:10.1021/ma025733d).

Record type: Article

Abstract

The structural relaxation caused by the plastic deformation of polymer glasses is not yet fully understood. In particular, the size scale of the localized plastic relaxation events is currently unknown. In this work, the effect of molecular entanglement density on the shear activation volume of glassy polymers has been studied. The shear activation volumes of miscible polystyrene?poly(2,6-dimethyl-1,4-phenylene oxide) (PS?PPO) blends at different PS/PPO ratios have been 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 ?e holds for the blend as well as for various pure glassy polymers:? = C(?e/nm-3)? + V0, with C = 8.2 ± 0.4 nm3, ? = 0.6 ± 0.03, and V0 < 0.1 nm3. The shear activation volume is closely related to the size of the plastic shear zones; therefore, this correlation suggests that the cooperativity of the elementary processes of plastic deformation in glassy polymers scales with ?e.

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Published date: 29 August 2003
Organisations: Chemistry, Faculty of Natural and Environmental Sciences, Magnetic Resonance

Identifiers

Local EPrints ID: 355573
URI: https://eprints.soton.ac.uk/id/eprint/355573
PURE UUID: 90b6ddf3-70d0-4a61-964f-566745fc06f5
ORCID for Marcel Utz: ORCID iD orcid.org/0000-0003-2274-9672

Catalogue record

Date deposited: 18 Nov 2013 14:25
Last modified: 14 Jul 2018 00:30

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