Abstract
AbstractA theory for the tensile strength of rubbers is presented. It gives reasonable agreement with the available experimental data for natural and synthetic rubber. One of the basic postulates of the theory is that, in order for the sample to break, conditions must be such that when one chain breaks the extra load thrown onto its near neighbors causes one of them to break. It appears that the effect of crystallites and filler particles is to decrease the additional load forced onto each of its neighbours when a segment breaks. This makes possible the effective use of higher degrees of crosslinking. The resultant increase in effective network chains is apparently responsible for the superior strength of the materials containing small solid particles, either crystallites or filler. It is also pointed out that the low number‐average molecular weight of GRS lowers the maximum strength of the unfilled polymer by about a factor of two. The effect is not nearly so large in the case of filled rubber.
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