Temperature dependence of polyetherimide
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This figure shows the course of the complex elasticity modulus and the visco-elastic damping tan delta in dependence of the temperature. The marked modulus decline for about 4 decades during the glass transition is particularly significant. Here, the material begins to flow. From the low temperature region (-150 °C) up to temperatures above the glass transition damping increases for 3 decades. Material changes from solid to liquid are detectable by this technique. |
Polymer test
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The picture shows the complex modulus of elasticity (E’, E’’) and damping of a polymer blend. Noticeable is here the continuous decrease of the complex modulus of elasticity with temperature. The line shape of the tan delta dependence on the temperature shows two glass transitions at |
