File:PPi DMA@10 Hz.png

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English: English release of this graph, see Image:iPP_DMA_10 Hz.png

Variation of the storage modulus and loss factor with temperature of an isotactic polypropylene (iPP). This material is a semi-crystalline thermoplastic polymer.
Results obtained from dynamic mechanical (thermal) analysis (DM(T)A).
Sample: film ; dim. (mm): H = 20.0  ; T = 0.6  ; W = 18.7.
Specimen holder: jaws.
Excitation mode: tension-compression.
Dynamic strain amplitude = 0.0002 (linear viscoelasticity).
Constant frequency f = 10 Hz.
Stabilized temperature tests (measures from -50 to 165 °C by steps of 5 °C => 44 measures ; test duration about 6 hours).
The storage modulus, E', (real part of the Young modulus, E) characterizes the stiffness of a viscoelastic material.
The flow region is typical of thermoplastics. In this region the polymer continues to soften with increasing temperature, as it melts, while the storage modulus takes on a very low value. For most rubberlike materials, such as cross-linked polymers, the flow region does not exist.
Tangent delta (dimensionless) is loss factor. It characterizes the vibration damping. Delta is the loss angle of the material.

Note: the glass transition temperature, Tg, (revealed in DMA by the characteristic peak of the loss factor) always increases with frequency.
Français : Version anglaise de ce graphe, voir Image:iPP_DMA_10 Hz.png

Variation du module de conservation et du facteur de perte avec la température d'un polypropène isotactique (PPi) (polymère thermoplastique semi-cristallin).
Courbes obtenues par analyse mécanique dynamique (AMD ou DM(T)A en anglais).
Type de sollicitation : traction-compression.
Dim. (mm) : H = 20,0  ; E = 0,6  ; L = 18,7 (éprouvette=film).
Porte-échantillon : pinces.
Taux de déformation dynamique = 0,0002 (viscoélasticité linéaire)
Tests à fréquence constante f = 10 Hz après stabilisation sur des paliers de température (mesures de -50 à 165 °C par pas de 5 °C). Cela représente 44 essais ; temps total de l'expérience : environ 6 heures.
Le module de conservation, E', (module d'Young E') caractérise la rigidité d'un matériau viscoélastique.
La zone d'écoulement est typique des polymères thermoplastiques.
Tangente delta (nombre adimensionnel) est le facteur de perte appelé aussi facteur d'amortissement. Il caractérise l'amortissement de vibrations ; delta est l'angle de perte du matériau.

Note : la température de transition vitreuse, Tg, (révélée en DMA par le pic caractéristique du facteur de perte) augmente avec la fréquence.
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Author Cjp24
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current10:50, 4 May 2009Thumbnail for version as of 10:50, 4 May 2009879 × 556 (14 KB)Cjp24 (talk | contribs){{Information |Description={{en|1=Thermogramm of a isotactic polypropylene (PPi) obtained from Dynamic Mechanical (Thermal) Analysis [DM(T)A] (performed at increasing temperature) at f=10 Hz.<br /> Mode : tension-compression.<br /> D

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