| Abstract: | The angular dependence of the intensity of scattered light from polystyrene/poly(2-chlorostyrene) blends was measured as a function of time in early and late stages of phase separation. The results were discussed in terms of Cahn's theory and scaling law for the late stage. Some distinctive behaviors which had not been found in other polymer blends were observed: the intensity of low-angle scattering increased significantly during phase separation, possibly because of inhomogeneities in density. In the power laws km α t? and Im α tθ for the time (t) evolution of the peak position km and peak heigh Im of the structure function in the late stage; the value of ? was around ?1, almost independent of composition and temperature; the ratio |θ/?| was less than the theoretical value 3. Possible explanations for these behaviors are discussed in relation to the glass transition. |
