AbstractExpressions were derived relating changes of intrinsic viscosity to reaction time, based on a scheme previously presented for the uncatalyzed, uninhibited thermal oxidation of polyolefins. A value of the kinetic parameterAmay be obtained from these expressions by using an iterative type of procedure and employing data presented by other workers for the oxidation of atactic polybutene‐1. This value ofAwas compared with the corresponding value obtained by the authors from rate of carbonyl formation studies in oxidation of atactic polybutene‐1 by means of infrared absorption spectroscopy methods. The good agreement between the values ofAobtained from the two different experimental techniques employed lends further support to the validity of the scheme used and the expressions derived theref
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