Synthesis and properties of poly(urelhancimides) from poly(oxylelramclhylene)glycols (in English)
Polimery 1993, No 8-9, 414
The poly(urcthancimidc) (PUI) elastomers, based on poly(oxytctramcthylcnc) glycols of MW 1000 and 2220, aromatic diisocyanatcs and dianhydridcs of aromatic tetracarboxylic acids, were characterized by investigation of prepolymer solution viscosity, stress-strain properties thermal and hydrolytic stability. The highest tensile strength (30-45 MPa) and good thermal stability of PUI, due to a high polyimidc content, was reached after full imidation by annealing PUI films at 160°C in vacuum. PUI exhibited better mechanical properties and hydrolytic stability in hot water than the corresponding polyurethane extended with 1,4-butancdiol. The temperature resistance of PUI, characterized by tensile strength of films, was dependent on the PUI structure and imide/urethane ratio. The flex life of PUI (up to 2 500 00 flexures at room temperature) was also strongly dependent on the film thickness.
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