Specific heats of guayule and natural rubbers above the glass transition temperature |
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Authors: | J.E. Castillo R.M. Hernandez E. Campos-Lopez |
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Affiliation: | Centro de investigacion en quimica aplicada, Saltillo, Coahuila Mexico |
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Abstract: | Heat capacities of guayule and natural rubbers were measured between 228 and 333 K using a DuPont 990 Differential Scanning Calorimeter. Data obtained were fitted to a straight line. We obtained the following equations where Cp is given in cal g?1 K?1. For guayule rubber, Cp = 22.6152 × 10?4T + 0.7731 (correlation factor = 0.99). For natural rubber. Cp = 16.9195 × 10?4T + 0.9209 (correlation factor = 0.98). Furthermore, some theoretical considerations and instrumental conditions were analyzed so that the determinations of heat capacities could be improved. |
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