AbstractLexan polycarbonate and polysulfone P‐1700 were blended to various weight percentages by dissolution in methylene chloride. The blended material was reclaimed in the form of evaporated thin films which were dried, ground, and molded. Low‐frequency mechanical relaxation tests were run on specimens machined from this material as a function of composition and thermal treatment. In addition to the β‐peak, a second peak, β′, was resolved in unannealed 75 wt/o P‐1700 specimens. These results are presented and a possible interpretation is discussed and compared with previously proposed
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