- Reptation Dynamics
- Mechanical / Viscosity / Viscoelasticity
- Materials Science
Rheology Simulation of Rubber.
courtesy of 
The dynamic viscoelastic properties of cross-linked poly-isoprene were calculated using a Primitive Chain Network model (NAPLES of OCTA). The effects of the distribution of cross-linked positions (Fig.1) were evaluated. The molar mass of each molecule was approximately 300k.
Fig.1 Distribution of cross-link on polymer chain.
The rolling resistance of a tire is related to tanδ (= G''/G'). In case 1 and 3, tanδ shows a low value at low frequencies (Fig.2).
This indicates that the chain end should be cross-linked to ensure a low rolling resistance.
Fig.2 Calculated tanδ for each case.
