Abstract
Two poly(ether urethane urea)s were synthesized, one based on poly(pro- pylene glycol) and another one on poly(tetramethylene glycol). Hydrogenated MDI was used as the diisocyanate and propylenediamine as the chain extender. The diisocya- nate : polyol : diamine molar ratio was 2 : 1 : 1 for both copolymers. Data from stress- relaxation tests were adjusted to a power law and to the Kohlraush-William-Watts equation. Phase separation and viscoelastic behavior were correlated through the calcu- lation of the time-relaxation spectrum, the steady-state tensile compliance, and the tensile viscosity. The results indicated that the material based on poly(tetramethylene glycol) was the more effectively phase-segregated block copolymer. q 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65: 2227-2236, 1997
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