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090			_aB-10385
245	1	0	_aPhase Separation and Phase Inversion of Polyurethane Networks
490	0		_vJournal of Polymer Research, 3(3), p.159-163, 1996
520	3		_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 wt
650	1	4	_aPOLYURETHANE NETWORKS
650	1	4	_aPHASE SEPARATION
650	1	4	_aPHASE INVERSION
650	1	4	_aTHERMAL PROPERTIES
650	1	4	_aMECHANICAL PROPERTIES
700	1	2	_aLee D.K.
700	1	2	_aTsai, H.B.
700	1	2	_aStandford, J.L.
856	4	0	_uhttps://drive.google.com/file/d/1Rz1qUtIDgrp6_nBRgCLBGUc8xZfzoOdt/view?usp=drivesdk _zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
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