The effect of temperature, static load, and electron irradiation on the deformation of linear polymeric films

Abstract

Experimental studies on the effect of temperature, static load and electron irradiation on the de-formation of polytetrafluoroethylene were carried out. Up to 35 °C the influence of load and tempera-ture leads to a sharp elongation of the samples, which is caused by the rectification of swirling com-plexes of macromolecules and rigidly connected chains. A catastrophic failure of weak circuits, includ-ing those associated with the presence of phase transitions occurs with increasing temperature to 45 °C. Curve (t) has a trend of a gradual recovery in the saturation at t > 40 °C, which is associated with rupture of the hard, more durable chains. The maximum deformation of 500 % is achieved at t = 85 °C and σ = 13 MPa. Dependences of the return deformation on time at static load and room tempera-ture are investigated. With increasing radiation dose, the return deformation decreases, and the strength limit of the polymer takes the value equal to 6 – 9 MPa. Electronic effects on literature the leads to a decrease in ductility and a significant decrease in recurrent strain that is associated with the destruction of the polymer. The curves described in the exponential model show satisfactory agree-ment of the experimental data with the calculation.