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Polyurethane-urea copolymer

Demir et al. prepared polyurethane urea copolymer solution in DMF and observed that the average fiber diameter (AFD) increases with the solution concentration as given by AFD = (Conc.)3. A trimodal distribution of the fiber diameter has been observed with fiber diameter varying from 7 nm to 1.5 pm (Demir et al. 2002). [Pg.216]

MORPHOLOGY AND PROPERTIES OF SEGMENTED POLYURETHANE-UREA COPOLYMERS PREPARED VIA t-ALCOHOL "CHAIN EXTENSION"... [Pg.103]

The structure-property behavior of novel tertiary alcohol-chain extended segmented polyurethane-urea copolymers was investigated. These copolymers were synthesized by utilizing the carbamate-isocyanate... [Pg.103]

Fig. 5 Dynamic mechanical spectra for segmented polyurethane-urea copolymers. ( ) PTMO-2000-MDI-41-CA, ( ), PTMO-2000-MDI-31-CA and (A) PTMO-2000-MDI-23.3-CA determined on the Rheovibron. 110 Hz frequency. Curves 1-3 are for storage moduli data and curve 4-6 are for loss modulus data. Fig. 5 Dynamic mechanical spectra for segmented polyurethane-urea copolymers. ( ) PTMO-2000-MDI-41-CA, ( ), PTMO-2000-MDI-31-CA and (A) PTMO-2000-MDI-23.3-CA determined on the Rheovibron. 110 Hz frequency. Curves 1-3 are for storage moduli data and curve 4-6 are for loss modulus data.
Table 3. Results From Low Temperature DSC Scans ( C) For Segmented Polyurethane-Urea Copolymers... Table 3. Results From Low Temperature DSC Scans ( C) For Segmented Polyurethane-Urea Copolymers...
Electrospinning behavior of elastomeric polyurethane urea copolymer in solution studied. The effects of electrical field, temperature, conductivity, and viscosity of the solution evaluated. [Pg.320]

Fan et al. reported the syntheses and properties of a polyurethane-urea, copolymers 88 from a aminoethyl-aminopropyl poly(dimethylsiloxane) 86 (AEAPS),... [Pg.192]

Siloxane-urethane segmented copolymers, which have very good mechanical, fatigue and surface properties 370,377 or their blends with conventional polyurethane-(ureas) have been successfully used in the production of blood pumps, intra-aortic balloons and artificial hearts 200,332,370,376,377). [Pg.72]

Block copolymers were developed rapidly in the 1960s when living anionic polymerization was first utilized to synthesize triblock thermoplastic elastomers or elastoplastics. At the same time, step or condensation polymerization to produce thermoplastic polyurethanes, urea-urethane spandex fibers, and later more specialized materials, such as the semicrystalline polyester-polyether copolymers were developed [10]. Imide block or segmented copolymers utilizing... [Pg.62]

Watanabe O, Tsuchimori M, Okada A. 1996. Two step refractive index changes by photoisomerization and photobleaching processes in the films of nonlinear optical polyurethanes and a urethane urea copolymer. J Mater Chem 6(9) 1487 1492. [Pg.44]

The morphology of dispersion particles was investigated using the method described in Section 6.4.1. Examples of different morphologies of particles of hybrid dispersions synthesised in this study according to methods la, lb and 3 are presented in Figure 6.31 in comparison with particles of the starting dispersion of BA/MM/S copolymer. The contrast was selected so that in pictures d and c white colour represents the polyurethane-urea part of the hybrid and in picture b the same colour represents the acrylic/styrene part of the hybrid. [Pg.317]

This TPE is a segmented polyurethane and is reported to be not significantly different from biomer in chemistry and molecular weight. It is a polytetra-methyleneoxide-based aromatic polyurethane urea with mixed aliphatic and cycloaliphatic diamine chain extenders. A copolymer of... [Pg.309]

ACRYLIC POLYURETHANES UREA-FORMALDEHYDE PVC 8i COPOLYMERS GLASS REINFORCED PVC CELLULOSICS... [Pg.989]

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