The invention relates to a preparation method of a PIPD / PBO (poly(dihydroxyphenylene pyridobisimidazole) / poly-p-
phenylene ben-zobisthiazole) blend
fiber and belongs to the technical field of blend fibers. The technology comprises the steps of preparation of a PIPD / PPA (phenyl-
propanolamine)
polymer solution, preparation of a PBO / PPA
polymer solution, mixed preparation of a PIPD / PBO
polymer, preparation of freshly formed filaments, drawing, solidification,
water washing and
drying. According to the PIPD / PBO blend
fiber prepared by the method, the PIPD polymer is introduced into a PBO
fiber, that is to say, a little PIPD is added into a PBO polymer matrix. The wettability and bonding performance of the PBO fiber with a
resin matrix are improved on the premise that the excellent
mechanical property, high-
temperature resistance and
flame resistance of the PBO fiber are not reduced.