Pulse propagation in polyester–solvent systems

摘要

AbstractThe propagation of sonic pulses through solvent‐swollen polyester yarns has been investigated. A discontinuity is observed in the temperature dependence of the pulse transit time which has been associated with the on set of the glass transition of the polyester–solvent system. Good agreement is reached for several systems with an extrapolated zero shrinkage temperature obtained from dynamic shrinkage determination of the filament in the appropriate solvent. The agreement between the two methods suggests that an interaction parameter for the polyester–solvent system is measured which must ba associated with the onset of its glass trans