By the use of polarized light microscopy

scanning elctron microscopy and chemical or solvent etching techniques

the crystalline morphologies of polyphenylene sulfide (PPS) and its blends with polysulfone (PSF) have been studied. It was found that for the PPS resin which was cured by heating in air

the crystalline morphologies in the bulk and in the surface region may be greatly different. Etching preferentially took place in the boundary of spherulites. With the increasing of PSF portion in the blend

the texture structure of blend changed gradually

e.g. a transform from a con-tinuous phase of PPS to a continuous phase f PSF

while the spherulite morphologies of PPS became irregular.