Effect of vulcanization on the low‐strain dynamic properties of filled rubbers

摘要

AbstractA change in the degree of vulcanization in a carbon black‐filled rubber is shown not to affect the change of in‐phase shear modulus with strain amplitude, provided the amount of filler is kept constant. Similar results are found with the change of out‐of‐phase modulus and phase angle with strain amplitude. A similar value of change of in‐phase shear modulus with strain amplitude (G′0–G′∞) is found for a vulcanized and unvulcanized tire tread rubber; this behavior is attributed for the breakdown of the secondary three‐dimensional carbon black aggregated network. Detailed consideration is given to other factors such as hydrodynamic, shape factor, and relaxation effects which contribute to the difference between the shear modulus of the gum rubber and the filled rubber when all the carbon black structure has been broken down. The consequence of the breakdown of the secondary aggregated structure of carbon black are considered in terms of factors affecting hea