Applications of Integral and Derivative Thermogravimetry to the Analysis of Rubber Formulations

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Abstract
Thermogravimetry, in the integral and derivative modes, can be used to determine the percentage composition of oil-extended EPDM and plasticized NBR formulations, even when the weight loss steps due to the various components overlap slightly. The percentages of extender oil or plasticizer, rubber, carbon black, graphite, and mineral filler can be determined in 2 hours or less from a single experiment. Derivative thermogravimetry also provides information on the volatility and identity of the extender oil in EPDM formulations, as well as the volatility and identity of the monomeric plasticizers in NBR formulations. Information about the type of carbon black in a formulation can also be obtained. Thermogravimetry appears to be an excellent method for the quality control and receiving inspection of EPDM and NBR formulations.

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