Abstract
Proton spin-spin relaxation time (T2) has been measured by the pulsed NMR technique for composites of natural rubber and carbon black prepared by Brabender mixing. The amounts and mobilities of tightly bound rubber and loosely bound rubber, which are determined by the free induction decay analysis, change with mixing time. At the first stage of mixing, the amounts of both components increase rapidly and the mobility of the tightly bound rubber decreases. The ratio of the tightly bound rubber to the loosely bound one decreases rapidly with time, reaching a limiting value at the black incorporation time. At the second stage, the amounts continue to increase at a slower rate but the mobilities become independent of the mixing time. At the third stage, no appreciable change occurs in the amount of each component. Thus, the tightly bound rubber appears to be formed very quickly when the rubber segments get in contact with a new active surface of carbon black, followed by the rapid growth of the loosely bound rubber component around the surface of the preformed tightly bound rubber phase.
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Serizawa, H., Ito, M., Kanamoto, T. et al. Structural Changes during Mechanical Mixing in Carbon Black-Natural Rubber Systems Studied by Pulsed NMR. Polym J 14, 149–154 (1982). https://doi.org/10.1295/polymj.14.149
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DOI: https://doi.org/10.1295/polymj.14.149
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