Wandering of crosslinks in rubber at high temperatures

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Abstract
By crosslinking natural rubber in benzene, networks are prepared in which the degree of coiling is higher than normal (“supercoiled” networks). On heating, these networsk are converted to normal ones with the same number of crosslinks but a lower degree of equilibrium swelling. The results of the swelling experiments are in quantitative agreement with theoretical predictions. Results of strees relaxation experiments at elevated temperatures support the conclusion reached on the basis of swelling. It follows that great caution is needed when calculating changes in the density of the crosslinks from changes in stress alone as is sometimes done in kinetic studies.

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