Rheology simulation of rubber

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Dynamic viscoelastic properties of cross-linked poly-isoprene was calculated by using Primitive Chain Network model (NAPLES of OCTA). Effects of distribution of cross-linked positions (Fig.1) was evaluated. Molar mass of each molecule is about 300k.

Fig.1 Distribution of cross-link on polymer chain

Rolling resistance of tire is related with tanδ (= G”/G’). In case1 and 3, tanδ shows low value at low frequency(Fig.2).

This means that chain end should be cross-linked to get low rolling resistance property.

Fig.2 Calculated tanδ in each case.