Determination of Unsaturation of Butyl Rubbers and Certain Branched Olefins. Iodine Monochloride Method

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Abstract
The reaction of iodine monochloride with highly branched olefins and polymers is abnormal in that the addition products formed possess steric strain and tend to decompose. The products of decomposition react further with iodine monochloride, generally leading to high results in the determination of unsaturation. Based upon the fact that the addition of iodine monochloride to the decomposition product is not so rapid as the addition of iodine monochloride to the original olefin or polymer, new procedures have been developed for the determination of unsaturation of highly branched ethylenic substances. The procedures have been shown to give reliable results for olefins such as the diisobutylenes and for copolymers, such as isoprene Butyl rubber and butadiene Butyl rubber.

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