The Role Of Molecular Weight And Temperature On The Elastic And Viscoelastic Properties Of A Glassy Thermoplastic Polyimide
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The Role of Molecular Weight and Temperature on the Elastic and Viscoelastic Properties of a Glassy Thermoplastic Polyimide
Author | : Lee M. Nicholson |
Publisher | : |
Total Pages | : 26 |
Release | : 2001 |
Genre | : Molecular weights |
ISBN | : |
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Mechanical testing of the elastic and viscoelastic response of an advanced thermoplastic polyimide (LaRC-SI) with known variations in molecular weight was performed over a range of temperatures below the glass transition temperature. The notched tensile strenght was shown to be a strong function of both molecular weight and temperature, whereas stiffness was only a strong function of temperature. A critical molecular weight was observed to occur at a weight-average molecular weight of ~22,000 g/mol below which, the notched tensile strength decreases rapidly. This critical molecular weight transition is temperature-independent. Low molecular weight materials tended to fail in a brittle manner, whereas high molecular weight materials exhibited ductile failure.
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