The influence of temperature on residual deformation of Phenylon and Nomex yarns following the creep-recovery process

摘要

High-performance synthetic filaments and yarns are subjected to different loads and temperature during their practical and industrial applications, resulting in changes in their mechanical properties. Knowledge of the deformation and strength properties of these polymer materials at various temperatures and different levels of preliminary stretching is therefore very important. Semi-rigid chain polymers Phenylon and Nomex yarns are popular materials for use at high temperatures. Their mechanical properties can be changed significantly at high temperatures. It is also shown that preliminary stretching of Phenylon and Nomex yarns at more than 5% will change the nature of the stress-strain curves due to the rearrangement of the supermolecular structures which occur at this elongation. However, there is no change in the character of accumulation of residual deformation at elevated temperatures for Phenylon and Nomex yarns.