Abstract
Abstract Bound rubber may be displaced by milling filled hydrocarbon elastomers with polar rubbers such as NBR. The displacement is not complete in a single stage. Crosslinking can be detected in filled natural rubber by moderate swelling and then measuring the freezing point depression caused by the rubber in the filled and unfilled state, a greater depression being observed for the filled state. Filled and unfilled CB at the same concentration in benzene seems to cause the same freezing point depression and so crosslinking during the reinforcement of this rubber, though known to exist from other behavior, seems not to be indicated by the freezing point method.
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