Evaluation of thermal degradation rubber by DMA

Dynamic mechanical analysis (DMA) allows for the evaluation of the state from low to high temperatures.

This introduces the evaluation of thermally degraded rubber using dynamic viscoelasticity measurements. A constant temperature bath capable of circulating air within the chamber was used as a suitable device for thermal degradation testing, and NBR rubber and EPDM rubber were heated at 100°C for a specified duration. The changes in viscoelastic behavior due to heating time were investigated. For both types of rubber, as the heating time increased, tanδ (= E"/E') showed a peak that shifted towards higher temperatures, and a decrease in peak value was observed. It is believed that the loss of rubber elasticity and the decrease in elastic modulus resulted in a shift of Tg towards higher temperatures. By measuring dynamic viscoelasticity, it becomes possible to confirm the changes in physical properties associated with material degradation and to gain insights into structural changes. Additionally, conducting other chemical analyses can clarify more specific changes in chemical structure. [Test Overview] ■ A constant temperature bath capable of circulating air within the chamber was used ■ NBR rubber and EPDM rubber were heated at 100°C for a specified duration ■ Changes in viscoelastic behavior due to heating time were investigated *For more details, please download the PDF or feel free to contact us.

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