Characterization of Hydrocarbon Waxes by Gel Permeation Chromatography and Differential Scanning Calorimetry

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Abstract
An integral part of many elastomer compounding recipes is the wax since it contributes significantly to the performance characteristics of the vulcanizate. Frequently the only quality control tests applied by the user are a simple melting point range and a percent insolubles. This work demonstrates two analytical techniques that can provide much improved quality control monitoring of waxes. Differential scanning calorimetry and gel permeation give not only data on the melting characteristics but also supply information on the chemical structure and size distribution of the waxes. Using these methods replacement waxes can be selected on a technically sound basis.