Mechanical behavior of poly(vinyl chloride) in the nonlinear range of viscoelasticity

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Abstract
Tensile creep tests and interrupted tensile tests were performed on poly(vinyl chloride) in order to check some consequences of a rheological model previously proposed to describe the creep behavior of glassy polymers in the linear as well as the nonlinear range of viscoelasticity. The results of the interrupted tensile tests allowed us to measure the stresses borne by the elastic elements as well as the recovery stresses related to the viscous elements of the model. The level found for these stresses did not agree with the values implied by the model. We propose here an improved model consisting of a nonlinear generalized Maxwell system. It takes into account the results of the tests and explains the viscous deformation by the destruction of an initial structure present in the polymer.

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