INTRODUCING THE BURGERS MODEL AND THE EXPERIMENTAL RESEARCH ON THE EFFECTS OF AGING ON VISCOELASTIC BEHAVIOR OF HIGH-DENSITY POLYETHYLENE

Abstract

The polymers are materials made up of macromolecular chains composed of a (monomer) unit repeated a great number of times. The polymers are in the form of two different structures: the amorphous state characterized by a disordered structure, and the crystalline state characterized by an ordered structure. The polymers may be completely amorphous or semi-crystalline. And the laws of behavior formulated are often nonlinear. They relate constraints, deformations, temperature to the evolution of internal variables.

In this paper we present detaily a model of Burgers and the experimentals results of the effects of aging on viscoelastic behavior on high-density polyethylene.

The results of the tensile creep tests carried out on the aged test pieces have clearly demonstrated the influence of the diffusion of the amyl acetate molecules in the HDPE on the creep behavior of this one. They showed in particular that the increase in the deformation of creep when the aging time increased.