Standard Practice for Stress Relaxation Testing of Raw Rubber, Unvulcanized Rubber Compounds, and Thermoplastic Elastomers

Importancia y uso:

5.1 The processing behavior (processability) of rubber or rubberlike materials is closely related to their viscoelastic properties. The viscoelastic properties as well as the mechanical properties are related to the polymeric, including macromolecular and micromolecular structure. Therefore, a determination of the viscoelasticity of a material will provide information to predict processing and service performance.

5.2 Stress relaxation testing provides a methodology for investigating the viscoelasticity of rubber or rubberlike materials. Certain structural characteristics that have been demonstrated to be evaluated by this test method are: (1) average molecular weight, (2) molecular weight distribution, (3) linearity or chain branching, (4) gel content, and (5) monomer ratio.

5.3 This practice is intended to describe various methods of measuring the stress relaxation properties of raw rubber, unvulcanized rubber compounds, or thermoplastic elastomers for determining the processability of these materials through viscoelastic measurements. Factory performance characteristics that this methodology may correlate with include die swell or shrinkage, extrusion rate, mill banding, carbon black incorporation time, and mold flow.

Subcomité:

D11.12

Referida por:

D6049-03R22

Volúmen:

09.01

Número ICS:

83.040.10 (Latex and raw rubber)

Palabras clave:

compression; elastomer; polymer; relaxation; rubber; shear; strain; stress; viscoelasticity;