01620nam a2200217Ia 4500003001000000005001700010040000900027245006600036490005500102520088400157650002601041650002101067650002001088650002301108650002601131700001301157700001501170700002001185856015601205008004101361MX-MdCICY20260521091211.0  cCICY10aPhase Separation and Phase Inversion of Polyurethane Networks0 vJournal of Polymer Research, 3(3), p.159-163, 19963 aA series of polyurethane networks were prepared from MDI (4,4'-diphenylmethane diisocyanate), ethylene glycol and a polyoxyethylene-tipped polyoxypropylene triol. The phase separation and phase inversion phenomena of these polyurethane networks were investigated by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA)and measurement of their tensile properties. The DSC and DMA data indicate that the segmented copolyurethanes possess a two-phase morphology comprising soft and hard segments. It can be found from DSC data that the polyether soft segments exhibit a Tg (glass transition temperature)Of -60 °C, and the aromatic hard segments display a Tg of about 128 °C. Two Tgs corresponding to the comprised segments can also be found by DMA for some segmented polyurethanes. Varying the content of aromatic hard segments over the range from 0 to 80 wt14aPOLYURETHANE NETWORKS14aPHASE SEPARATION14aPHASE INVERSION14aTHERMAL PROPERTIES14aMECHANICAL PROPERTIES12aLee D.K.12aTsai, H.B.12aStandford, J.L.40uhttps://drive.google.com/file/d/1Rz1qUtIDgrp6_nBRgCLBGUc8xZfzoOdt/view?usp=drivesdkzPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx250602s9999    xx |||||s2   |||| ||und|d