The paracrystal

porous and phase structures of the blend acrylic fibers has been investigated. It was found that the blend acrylic fiber in the present work is a kind of matrix-fibril bicomponent porous fiber

phase separation takes place in it. The micropores

formed on the interfaces between two polymer domains

appear to be well oriented in the direction of the fiber axis and elongated into cylinderlike in the same direction. Furthermore

they are not isolated but penetrated

which makes the blend fiber high water retention.