The τ-effective paradox: New measurements towards a resolution

Srinivas Kolla; Sindee L. Simon

doi:10.1016/j.polymer.2004.11.086

The τ-effective paradox: New measurements towards a resolution

Srinivas Kolla, Sindee L. Simon

Chemical Engineering

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

New volume recovery measurements have been made on an epoxy glass for temperature down- and up-jumps from 1.0 to 4.0 K to investigate the τ-effective paradox. Due to the sensitivity of the measurements and to the fact that data points are obtained linearly in time, we are able to accurately measure the effective relaxation time at much smaller departures from equilibrium than those examined originally by Kovacs and subsequently by other researchers. The paradox is observed for the largest (2.0 and 4.0 K) up-jumps performed at the highest aging temperature. The magnitude of the expansion gap disappears as the departure from equilibrium approaches zero indicating a resolution of the paradox.

Original language	English
Pages (from-to)	733-739
Number of pages	7
Journal	Polymer
Volume	46
Issue number	3
DOIs	https://doi.org/10.1016/j.polymer.2004.11.086
State	Published - Jan 26 2005

Keywords

Glass
Structural recovery
Volume recovery

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10.1016/j.polymer.2004.11.086

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title = "The τ-effective paradox: New measurements towards a resolution",

abstract = "New volume recovery measurements have been made on an epoxy glass for temperature down- and up-jumps from 1.0 to 4.0 K to investigate the τ-effective paradox. Due to the sensitivity of the measurements and to the fact that data points are obtained linearly in time, we are able to accurately measure the effective relaxation time at much smaller departures from equilibrium than those examined originally by Kovacs and subsequently by other researchers. The paradox is observed for the largest (2.0 and 4.0 K) up-jumps performed at the highest aging temperature. The magnitude of the expansion gap disappears as the departure from equilibrium approaches zero indicating a resolution of the paradox.",

keywords = "Glass, Structural recovery, Volume recovery",

author = "Srinivas Kolla and Simon, {Sindee L.}",

note = "Funding Information: The financial support of NSF DMR-0308762 is gratefully acknowledged. Helpful discussions with Prof. G.B. McKenna are also appreciated.",

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AU - Kolla, Srinivas

AU - Simon, Sindee L.

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PY - 2005/1/26

Y1 - 2005/1/26

N2 - New volume recovery measurements have been made on an epoxy glass for temperature down- and up-jumps from 1.0 to 4.0 K to investigate the τ-effective paradox. Due to the sensitivity of the measurements and to the fact that data points are obtained linearly in time, we are able to accurately measure the effective relaxation time at much smaller departures from equilibrium than those examined originally by Kovacs and subsequently by other researchers. The paradox is observed for the largest (2.0 and 4.0 K) up-jumps performed at the highest aging temperature. The magnitude of the expansion gap disappears as the departure from equilibrium approaches zero indicating a resolution of the paradox.

AB - New volume recovery measurements have been made on an epoxy glass for temperature down- and up-jumps from 1.0 to 4.0 K to investigate the τ-effective paradox. Due to the sensitivity of the measurements and to the fact that data points are obtained linearly in time, we are able to accurately measure the effective relaxation time at much smaller departures from equilibrium than those examined originally by Kovacs and subsequently by other researchers. The paradox is observed for the largest (2.0 and 4.0 K) up-jumps performed at the highest aging temperature. The magnitude of the expansion gap disappears as the departure from equilibrium approaches zero indicating a resolution of the paradox.

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JO - Polymer

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ER -

The τ-effective paradox: New measurements towards a resolution

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