The relationship between the mechanical properties and molecular structure of glassy polymers is very useful for understanding their deformation behavior, which would govern several applications. The deformation behavior during yield, is an important mechanical characteristic. Several researchers have modeled the visco-elasto- plastic deformation behavior of glassy polymers, using mechanical elements like springs and dashpots, which are then qualitatively related to the molecular structure of the glassy network [1 - 3]. The yield behavior has been investigated in terms of the Eyring equation for the dashpot [1].
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