Role of strain rate in the strain-induced crystallization (SIC) of natural and synthetic isoprene rubber
2019
The role of strain rate (
$${\it{\dot \varepsilon }}$$
e
) in the strain-induced crystallization (SIC) of vulcanized natural rubber (NR) and synthetic isoprene rubber (IR) was studied using in situ wide-angle X-ray scattering (WAXS) (synchrotron X-ray radiation). We developed homemade extension equipment and coupled it with the synchronized time-resolved X-ray detector system. The nucleation rate (I) was determined for a wide range of $${\it{\dot \varepsilon }}$$
e
values (0.0075 s−1–330 s−1) based on the increase in the scattering intensity (IX) as a function of time (t). We found that I is proportional to $${\it{\dot \varepsilon }}$$
e
(
$$I \propto \dot \varepsilon$$
I
∝
e
). Based on this result, we concluded that $$\dot \varepsilon$$
e
plays an important role in the kinetic mechanism of the SIC of NR and IR.
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