Dynamic bending properties of fibers: Effect of temperature on nylon 66, terylene, orlon, and viscose rayon

Abstract

Abstract The dynamic bending modulus and loss modulus have been measured over a range of temperature from −70 to 170°C. for single textile filaments of nylon 66, Terylene, Orlon, and viscose rayon in the dry state, using a vacuum electrostatic method which is described. Maximum loss modulus occurred at −40°C. and 115°C. for nylon, at −60°C. and 140°C. for Terylene, at 70°C. and 110°C. for Orlon, and at −20°C. and 90°C. for viscose rayon. Application of rate process theory to these transition regions gave activation energies in support of the interpretation that the low‐temperature transition is associated with segmental motion and the high‐temperature transition involves breaking of secondary bonds, e.g., hydrogen bonds in nylon 66. In an appendix, the theory of lateral vibration of viscoelastic bars is treated in some detail, in particular as it applies to calculate successfully the large correction for air damping of fine filaments.