Standard Practice for Plastics: Dynamic Mechanical Properties: Determination and Report of Procedures

Importancia y uso:

5.1 Dynamic mechanical testing provides a method for determining elastic and loss moduli as a function of temperature, frequency or time, or both. A plot of the elastic modulus and loss modulus of material versus temperature provides a graphical representation of elasticity and damping as a function of temperature or frequency, respectively.

5.2 This procedure can be used to locate transition temperatures of plastics, that is, changes in the molecular motions of a polymer. In the temperature ranges where significant changes occur, elastic modulus decreases rapidly with increasing temperature (at constant or near constant frequency) or increases with increasing frequency (at constant temperature). A maximum is observed for the loss modulus, as well as for the tan delta curve, in the transition region.

5.3 This procedure can be used, for example, to evaluate by comparison to known reference materials or control materials:

5.3.1 Degree of phase separation in multicomponent systems,

5.3.2 Filler type, amount, pretreatment, and dispersion, and

5.3.3 Effects of certain processing treatment.

5.4 This procedure can be used to determine the following:

5.4.1 Stiffness of polymer composites, especially as a function of temperature,

5.4.2 Degree of polymer crystallinity, and

5.4.3 Magnitude of triaxial stress state in the rubber phase of rubber modified polymers.

5.5 This procedure is useful for quality control, specification acceptance, and research.

5.6 Procedural modifications in material specifications take precedence to this practice. Therefore, consult the appropriate material specification before using this practice. Table 1 of Classification System D4000 lists the ASTM materials standards that currently exist.

Subcomité:

D20.10

Referida por:

D5024-23, D4473-08R21, D7028-07R24, D6456-10R18, D7745-19, D0696-24, D6341-21, D7750-23, D5023-23, D5026-23, D4440-23, D2990-17, D5279-21, D6456-10R18, D5418-23, D4762-23, F0561-19, E1300-24

Volúmen:

08.02

Número ICS:

83.080.01 (Plastics in general)

Palabras clave:

dynamic mechanical; modulus; rheological; tan delta; viscoelastic ;