Abstract
Polyether-polyurethane (PEPU) copolymers based on poly(propylene glycol) (PPO), 4,4′-diphenylmethane diisocyanate (MDI), and different chain extenders [1,5-pentanediol (P), diethylene glycol (D), triethylene glycol (T), and 1,3-bis( N, N′-methyl- N, N′-2-hydroxyethyl)isophthalamide (Bi(M))] were prepared and characterized. The gross properties and the carbonyl absorption patterns in i.r. spectroscopy suggest that the degree of phase separation or hard domain crystallinity decreases in the order of P- > D- > Bi(M)- and T-extended PEPU. D.s.c. results suggest phase-separated systems of PPO/MDI/P, PPO/MDI/D and PPO/MDI/Bi(M), in contrast to a phase-mixed PPO/MDI/T system. The absence of a high temperature melting transition refers to the existence of an amorphous hard domain in the PPO/MDI/Bi(M) system. Chain length, flexibility, and aromatic content of the applied chain extenders control the extent of phase separation of the final products.
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