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Thermal Analysis of Selected Commercial Thermoplastic Resins
DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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Thermogravimetric Analysis TGA and Differential Scanning Calorimetry DSC were used to characterize and identify several commercial thermoplastics used or considered for use in Canadian C4 gas masks. The goal was to build a database from which unknown thermoplastic samples could be fingerprinted. A secondary goal was to characterize the thermal transitions of the polymers to determine the effect of processing. Both TGA and DSC demonstrated characteristic thermal transitions of the particular polymer used in the sample. In some cases, the presence and amount of inorganic fillers could be detected, as well as polymer blend composition. The effect of thermal history was also determined for Noryl and Valox resins by heating and then quench cooling the samples. The thermal transitions of the more crystalline Valox were dependent on the thermal history whereas the amorphous Noryl could be repeatedly heated and cooled, maintaining reproducible thermal transitions.
APPROVED FOR PUBLIC RELEASE