Abstract
Influence of soft segments, i.e., polyether and polyester, on the elastic recovery and the characteristics of heat set has been studied of the linear polyurethane elastomers prepared by the usual method.It has been found that the variation in soft segment does not influence very much on the degree of heat set, but significantly on the elastic recovery.The fine structure, orientation and crystallization was investigated by the X-ray diffraction method. It has been concluded that the elastic recovery is greatly attributed to the orientation and crystallization of the soft segment, because of the orientation and crystallization of the soft segment by drawing the sample and the low elastic recovery of the highly crystalline sample after removal of the tension.
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