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Polymers of carbonic acid—9. segmented polybiurets containing poly(ethylene oxide) soft segments

✍ Scribed by Hans R. Kricheldorf; Jochen Meier-Haack

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
306 KB
Volume
29
Category
Article
ISSN
0014-3057

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✦ Synopsis

Al~tract--Poly(ethylene oxide), with number-average molecular weight 2000 g/tool and containing two amino end-groups, served as starting material for segmented polybiurets. After silylation, the poly(ethylene oxide) was polycondensed with chloroformylisocyanate and silylated 1,6-diaminohexane, 4,4'-diaminodiphenylmethane or L-lysine et-ethylester. The copolybiurets isolated after precipitation in non-solvents contained a higher fraction of oligobiuret hard segments than expected from the feed ratio. Most polybiurets were characterized by elemental analyses, inherent viscosities, i.r., tH-NMR and DSC. In two cases, WAXS powder patterns confirmed a low degree of crystallinity. A preliminary study of the hydrolytic degradation in neutral and alkaline water was conducted.

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