Poly(urethaneamideimide)s from a cycloaliphatic diisocyanate
Polimery 1998, No 7-8, 449
Poly(urethaneamideimide)s (PURAI) were obtained from polyoxytetramethylene glycol, trimellitic anhydride, and 4,4'-methylene-bis-(cyclohexylisocyanate) (SMDI) with various contents of the trans-trans isomer. They were compared with the PURAI prepared from 4,4'-diphenylmethane diisocyanate (MDI) and some commercial biomedical polyurethanes. The former PURAI exhibited a lower stiffness, lower tensile strength (Table 1, Fig. 2), a much lower modulus of elasticity decreasing rapidly with temperature (Table 2, Figs. 3—5), a higher thermal stability (higher decomposition temperature) (Table 3, Fig. 6), and a higher hydrolytic stability toward hot water (Table 4). The sessile contact angle for water was lower but water absorption was higher as compared with that of the former PURAI (Table 4).
Keywords: poly(urethaneamideimide)s, cycloaliphatic diisocyanate, mechanical, thermal and hydrolytic properties in relation to chemical structure