Physical aging deep in the glassy state of a fully cured polyimide

R. A. Venditti,

R. A. Venditti

Polymer Materials Program, Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544

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J. K. Gillham,

Corresponding Author

J. K. Gillham

Polymer Materials Program, Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544

Polymer Materials Program, Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544===Search for more papers by this author

R. A. Venditti,

R. A. Venditti

Polymer Materials Program, Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544

Search for more papers by this author

J. K. Gillham,

Corresponding Author

J. K. Gillham

Polymer Materials Program, Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544

Polymer Materials Program, Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544===Search for more papers by this author

First published: 25 July 1992

https://doi.org/10.1002/app.1992.070450901

Citations: 19

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Abstract

Physical aging of a fully cured polyimide/glass fiber specimen has been investigated deep in the glassy state using a freely oscillating torsion pendulum (TBA). A single specimen, the physical aging effects of which could be erased by heating to above T_g = 304°C (0.8 Hz), could be used for all experiments. Data were obtained during isothermal aging at different aging temperatures, T_α, (from 10°C to T_g) and during subsequent temperature scans (T_α to 5 to 315°C). The aging rate depended upon the value of T_α relative to both T_g and the β-relaxation temperature, T_β = 139°C (1.3 Hz). Changes in thermomechanical behavior due to aging were localized about T_α. This suggests that only an intermediate portion of the relaxation spectrum participates in, and is affected by, isothermal physical aging. It follows, and is observed, that the intensity of the β-relaxation mechanical loss peak is perturbed most significantly by aging at T_α near T_β. The effect of isothermal aging deep in the glassy state could be essentially eliminated by heating to below T_g. © 1992 John Wiley & Sons, Inc.

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Volume45, Issue9

25 July 1992

Pages 1501-1516

Physical aging deep in the glassy state of a fully cured polyimide

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Physical aging deep in the glassy state of a fully cured polyimide

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