Standard Test Method for Plastics: Dynamic Mechanical Properties Melt Rheology

Importancia y uso:

5.1 This test method provides a simple means of characterizing the important rheological properties and viscosity of thermoplastic polymers using very small amounts of material (approximately 25 to 50 mm in diameter by 1 to 3 mm in thickness ... approximately 3 to 5 g). Data are generally used for quality control, research and development, and establishment of optimum processing conditions.

5.2 Dynamic mechanical testing provides a sensitive method for determining molten polymer properties by measuring the elastic and loss moduli as a function of frequency, strain, temperature, or time. Plots of viscosity, storage, and loss moduli, and tan delta as a function of the aforementioned process parameters provide graphical representation indicative of molecular weight, molecular weight distribution, effects of chain branching, and melt-processability for specified conditions.

5.2.1 Observed data are specific to experimental conditions. Reporting in full (as described in this test method) the conditions under which the data was obtained is essential to assist users with interpreting the data an reconciling apparent or perceived discrepancies.

5.3 Values obtained in this test method can be used to assess the following:

5.3.1 Complex viscosity of the polymer melt as a function of dynamic oscillation,

5.3.2 Processing viscosity, minimum as well as changes in viscosity as a function of experimental parameters,

5.3.3 Effects of processing treatment,

5.3.4 Relative polymer behavioral properties, including viscosity and damping, and

5.3.5 Effects of formulation additives that might affect processability or performance.

5.4 Before proceeding with this test method, refer to the specification for the material being tested. Any test specimen preparation, conditioning, dimensions, or testing parameters, or combination thereof, covered in the relevant ASTM materials specification shall take precedence over those mentioned in the test method. If there are no relevant ASTM material specifications, then the default conditions apply.

Subcomité:

D20.10

Referida por:

D4065-20

Volúmen:

08.02

Número ICS:

83.080.20 (Thermoplastic materials)