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Polyurethane hard-segment composition

Table III. Surface and Bulk Composition of Segmented Polyurethanes, Hard-Segment Analogues, and Soft-Segment... Table III. Surface and Bulk Composition of Segmented Polyurethanes, Hard-Segment Analogues, and Soft-Segment...
Table 5. SURFACE AND BULK COMPOSITION OF SEGMENTED POLYURETHANES "HARD SEGMENT ANALOGS AND "SOFT" SEGMENT PRECURSORS... [Pg.242]

Chen K T, Chui Y J and Shieh S T (1997) Glass transition behaviors of a polyurethane hard segment based on 4,4 -diisocyanatodiphenylmethane and 1,4-butanediol and the calculation of microdomain composition, Macromolecules 30 5068-5074. [Pg.429]

Polyurethane hydrogels derived from UV curable urethane prepolymer and hydrophilic monomers were prepared and their properties were evaluated. The urethane prepolymer used in this study contained well-defined hard segments centered with a polyether-based soft segment and end-capped with methacrylate groups. The hydrophilic monomers studied were 2-hydroxyethyl methacrylate (HEMA), N-vinyl pyrrolidone, and glycerol methacrylate. Methacryloxypropyl tris(trimethysiloxy) silane (TRIS) was also used in some cases to modify properties. All compositions were UV... [Pg.175]

The a Relaxation of 2,4-T-lP. Only the 2,4-T-lP block polyurethanes exhibited a single major a relaxation which had a strongly composition-dependent position. Similar behavior was observed by See-fried and co-workers (10) for polyurethanes containing a TDI/BD hard segment and a 2100-Mn polycaprolactone hard segment. The extreme... [Pg.123]

Molecular models (2) of the hard-segment phase of segmented polyether polyurethanes tested in the in vitro bead column (4) show a high platelet retention index (p = 0.8) regardless of molecular composition. The variable p is defined as the fraction of platelets in whole citrated human blood entering a test column that are retained on the bead surfaces, averaged for... [Pg.100]

Fig. 12.15 Modulus-temperature curves for two polyurethanes with different compositions. Note the two glass-transition temperatures for each polymer, corresponding to those of the hard and soft segments. (Adapted by permission of John Wiley Sons, Inc.)... Fig. 12.15 Modulus-temperature curves for two polyurethanes with different compositions. Note the two glass-transition temperatures for each polymer, corresponding to those of the hard and soft segments. (Adapted by permission of John Wiley Sons, Inc.)...
Polyurethane Mw of PVB 170,000 18.5% hydroxyl content. PU Tecoflex EG-85A (from methylene bis cyclohexyl diurethane and polytetramethylene ether glycol). Extrusion blended DMA, DSC, TEM Miscible over entire composition range, due to interaction of PVB with hard segment. Single Tg, decreasing with PU content. Model compounds of the hard segment are also miscible (23)... [Pg.921]

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See also in sourсe #XX -- [ Pg.27 , Pg.28 ]



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