File:Vulcanized polybutadiene-DMA.png

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English: Simplified version of File:DMA rubber.gif shown below.

Variation of the storage modulus (which characterizes the stiffness of a viscoelastic material), E', and loss factor, tangent delta, with temperature.
Material based on vulcanized polybutadienes (code: BR).
Composition: blend of solid and semi-liquid BR, fillers, vulcanization system, additives, etc.; sealant vulcanized for ~30 min at ~180 °C.
Technique used: DMA, tension-compression at constant frequency f = 1 Hz; stabilized temperature.
For the final product (cured), at 1 Hz: Tg ~15 °C and E' ~250 MPa at 23 °C.

This elastomeric sealant for automobiles is a good damping of vibrations around the ambient temperature at 1 Hz because the damping (or loss) factor is greater than 0.2 between 10 and 30 °C.
Français : Version simplifiée de File:DMA rubber.gif présenté ci-dessous.

Variation du module de conservation (qui caractérise la rigidité d'un matériau viscoélastique), E', et du facteur de perte, tangente delta, avec la température.
Matériau à base de polybutadiènes (sigle BR) vulcanisés.
Formulation : mélange de BR solide et semi-liquides, charges, système de vulcanisation, additifs, etc. ; mastic vulcanisé pendant ~30 min à ~180 °C.
Technique utilisée : DMA, traction-compression à fréquence constante f = 1 Hz ; température stabilisée.
On relève à 1 Hz sur le matériau final (cuit) : Tg ~15 °C et E' ~250 MPa à 23 °C.

Ce mastic élastomère pour automobile est un bon amortissant de vibrations autour de l'ambiante à 1 Hz, car le facteur d'amortissement (ou de perte) est supérieur à 0,2 entre 10 et 30 °C.
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Author Cjp24
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DMA on a polymer material.

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current23:05, 13 November 2009Thumbnail for version as of 23:05, 13 November 2009914 × 641 (34 KB)Cjp24 (talk | contribs){{Information |Description={{en|1=Variation of the storage modulus and loss factor with temperature on a vulcanized polybutadiene (BR) material by DMA technique at f=1 Hz.<br /> Formula : blend of solid and semi-liquid BR - sealant cured 30 mn at 180°C.}

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