A simple ozonolytic method has been developed which enables the natural rubber trunk chains of rubber‐polymethyl methacrylate and rubber‐polystyrene interpolymers to be degraded into low molecular weight fragments from which the liberated polymer may be easily separated for characterization purposes. A dialkyl sulfide is used as a protective agent to prevent the attack of ozone on the polymer and the marked drop in molecular weight which would otherwise result.
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Dale L. Barnard (1956) studied this question.
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