Whentheflowpropertiesofpolymermeltsandsolutionscanbemeasuredoverawideenoughrangeofshearing,thelogarithmicflowcurvesappearasinFigure14.1.Itisgenerallyobservedthat:(1)Atlowshearrates(orstresses),a‘lowerNewtonian’regionisreachedwithaso-calledzero-shearviscos (共 7205 字) [阅读本文] >>