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Effect of plastic deformation on the microstructure and properties of amorphous polycarbonate

Authors
Journal
Materials Science and Engineering A
0921-5093
Publisher
Elsevier
Publication Date
Volume
110
Identifiers
DOI: 10.1016/0921-5093(89)90174-3

Abstract

Abstract Polycarbonate specimens were subjected to a plastic strain cycle at room temperature by means of a computer-controlled shear apparatus. The strain-cycling has several consequences: it softens the further plastic behaviour of the material, it increases the β relaxation peak observed between 300 and 400 K by dynamic mechanical analysis, and it generates an exothermic shoulder in the differential scanning calorimetry plot at 350 K. The experimental results are analysed in terms of a model which, during shear straining, involves the nucleation of quasi-point defects of higher molecular mobility. These defects persist in large density after strain cycling and are responsible for the changes in material behaviour reported. In particular, the evolution of the loss tangent spectra was analysed quantitatively by means of a computer simulation based on the elimination of the defects.

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