Enthalpy recovery of polystyrene: Does a long-term aging plateau exist?

Yung P. Koh; Sindee L. Simon

doi:10.1021/ma4011236

Enthalpy recovery of polystyrene: Does a long-term aging plateau exist?

Yung P. Koh, Sindee L. Simon

Chemical Engineering

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81 Scopus citations

Abstract

A glass is not in thermodynamic equilibrium below its glass transition temperature (T_g), and consequently, its properties, such as enthalpy, volume, and mechanical properties, evolve toward equilibrium in a process known as structural recovery or physical aging. Several recent studies have suggested that the extrapolated liquid line is not reached even when properties have ceased to evolve. In this work, we present measurements of the enthalpy recovery of polystyrene at an aging temperature 15 C below the nominal T_g, for aging times up to 1 year. The results indicate that the equilibrium liquid enthalpy line can indeed be reached for aging 15 K below T_g. The results are analyzed in the context of the TNM model of structural recovery.

Original language	English
Pages (from-to)	5815-5821
Number of pages	7
Journal	Macromolecules
Volume	46
Issue number	14
DOIs	https://doi.org/10.1021/ma4011236
State	Published - Jul 23 2013

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title = "Enthalpy recovery of polystyrene: Does a long-term aging plateau exist?",

abstract = "A glass is not in thermodynamic equilibrium below its glass transition temperature (Tg), and consequently, its properties, such as enthalpy, volume, and mechanical properties, evolve toward equilibrium in a process known as structural recovery or physical aging. Several recent studies have suggested that the extrapolated liquid line is not reached even when properties have ceased to evolve. In this work, we present measurements of the enthalpy recovery of polystyrene at an aging temperature 15 C below the nominal Tg, for aging times up to 1 year. The results indicate that the equilibrium liquid enthalpy line can indeed be reached for aging 15 K below Tg. The results are analyzed in the context of the TNM model of structural recovery.",

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T2 - Does a long-term aging plateau exist?

AU - Koh, Yung P.

AU - Simon, Sindee L.

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N2 - A glass is not in thermodynamic equilibrium below its glass transition temperature (Tg), and consequently, its properties, such as enthalpy, volume, and mechanical properties, evolve toward equilibrium in a process known as structural recovery or physical aging. Several recent studies have suggested that the extrapolated liquid line is not reached even when properties have ceased to evolve. In this work, we present measurements of the enthalpy recovery of polystyrene at an aging temperature 15 C below the nominal Tg, for aging times up to 1 year. The results indicate that the equilibrium liquid enthalpy line can indeed be reached for aging 15 K below Tg. The results are analyzed in the context of the TNM model of structural recovery.

AB - A glass is not in thermodynamic equilibrium below its glass transition temperature (Tg), and consequently, its properties, such as enthalpy, volume, and mechanical properties, evolve toward equilibrium in a process known as structural recovery or physical aging. Several recent studies have suggested that the extrapolated liquid line is not reached even when properties have ceased to evolve. In this work, we present measurements of the enthalpy recovery of polystyrene at an aging temperature 15 C below the nominal Tg, for aging times up to 1 year. The results indicate that the equilibrium liquid enthalpy line can indeed be reached for aging 15 K below Tg. The results are analyzed in the context of the TNM model of structural recovery.

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SP - 5815

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JO - Macromolecules

JF - Macromolecules

IS - 14

ER -

Enthalpy recovery of polystyrene: Does a long-term aging plateau exist?

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