Carboxyl-terminated polytetramethyleneoxides

the adducts of hydroxyl-terminated poly-tetrahydrofuran and maleic anhydride

were used as toughener for epoxy resins. The mor-phologh of the toughened resin was investigated by means of turbidity measurment

dynamic mechanical testing and scanning electron microscope observation. It turned out that the molecular weight of the polyether and the curing temperature are important factors

which affect the particle size of the polyether domcain and

in turn

the mechanical properties of the toughened resin.