Citation: WANG Dexi, R. E. Lyon, R. J. Farris. MECHANICAL BEHAVIORS OF POLYURETHANE-UREA ELASTOMERIC FIBERS UNDER STATIC STRETCHING DEFORMATION[J]. Chinese Journal of Polymer Science, ;1986, 4(3): 262-273. shu

MECHANICAL BEHAVIORS OF POLYURETHANE-UREA ELASTOMERIC FIBERS UNDER STATIC STRETCHING DEFORMATION

Received Date: 2 March 1986

The mechanical behaviors of polyether (ET) and polyester (ES) soft segment urethane-ureaelastomeric fibers constrained at different levels of elongation have been investigated by means ofdynamic mechanical tests and force-temperature measurements. The dynamjc mechanical re-sponse of the ET urethane-urea showed some difference from that of the ES as a function of exten-sion ratio. For force-temperature measuring the existence of a low temperature transition corre-sponding to the glass transition (Tg's) of the ester or ether soft segments,stree-softening temperature(Ts) and initial melting temperature(Tmh) of hard segment crystallites was observed.The result of cyclic testing of a constrained sample as a function of temperature indicated that the irreversible decrease in stress implied a permanent change in sample microstructure.
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