AbstractRubber‐modified acrylic polymers with rubber contents of 0, 1, 4, 7, 10, 13, and 16 were investigated to determine the effects of cold deformations on their mechanical and dynamic mechanical properties. A Rheovibron was used to determine damping as a function of temperature at four frequencies. A cold‐rolled film and a cold‐drawn film, stretched until fully crazed, were investigated. It was shown that cold deformation produces a small shift in the glass transition temperature of the rubber phase while the activation energy remains nearly unchanged. Also, the nature of the damping curve of the glassy matrix near the glass transition temperature of the matrix is altered by the appearance of a shoulder in the
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