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Application of Ultrasonic Techniques to Study the Properties of Silicone Elastomers in High Pressure Gas Media

Published online by Cambridge University Press:  21 February 2011

Brian J. Briscoe  and
Salman Zakaria
Brian J. Briscoe
Affiliation:
Department of Chemical Engineering and Technology, Imperial College of Science Technology and Medicine, London SW7, England.
Salman Zakaria
Affiliation:
Department of Chemical Engineering and Technology, Imperial College of Science Technology and Medicine, London SW7, England.
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Abstract

Polymers absorb large quantities of gas under high pressure. This process is usually accompanied by a significant volumetric strain and also by changes in the mechanical properties of the sample. We will describe how these properties may be studied by using an ultrasonic technique. The sorption and volumetric changes are progressive in nature following the application of an incremental increase or decrease in ambient pneumatic stress. These techniques are also used to follow the time dependent changes in both the linear strain and the mechanical properties of the system. Data will be cited for a range of nitrogen gas pressures up to 27 MPa at 20°C for a virgin Poly-dimethylsiloxane (PDMS) elastomer and for its composite with glass filler to exemplify the experimental and analytical procedures. The final section of the paper shows how the same techniques may be used to monitor the inception and progressive development of internal cracks during certain ambient gas decompression profiles.

The information obtained provides a basis for better material selection and for the specification of the service life of particular materials in hostile environments.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 142: Symposium U – Nondestructive Monitoring of Materials Properties , 1988 , 239
Copyright
Copyright © Materials Research Society 1989

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