Abstract
AbstractChanges in the infrared spectra due to the introduction of 1 to 4 chlorine atoms per isoprene unit in the natural rubber molecule have been studied. Four prototypes are discussed in greater detail: hydrochlorides, rubber dichlorides, chlorinated hydrochlorides, and products obtained by the direct chlorination of rubber and of cyclized rubber. Within certain limits it is possible to follow double bond shifts which occur during the process of hydrochlorination or of chlorination. Chlorinated rubber differs from other chlorinated polymers with a similar composition by a large reduction of the intensity of the CH3 frequency. Absorptions due to the presence of chlorine atoms are observed in the 13–18 μ region, but these bands show little individual differences. Small quantities of oxygen in the form of CO or OH groups are readily detected.
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