High-temperature dynamic thermomechanical analysis of NBS 711 glassy fiber

Abstract The complex modulus in bending of NBS 711 glassy fibers was investigated using dynamic thermomechanical analysis (DTMA) in a wide temperature range from room temperature to the supercooled liquid region through the glass transition region. Temperature dependencies of both real part, E′, and imaginary part, E″, of the dynamic modulus as well as the loss angle, tanδ, were studied as a function of heating rate and frequency. Experimental data were compared with results of the static thermomechanical analysis and one kind of dynamic DSC (StepScan DSC), viscosity data of NBS 711 were also used. Good agreement of DTMA and StepScan DSC results was found. Activation energy of plastic deformation calculated from frequency dependence of E″ and activation energy of viscous flow were found close to each other.