Abstract
Later-stage spinoidal decomposition (SD) of off-critical mixtures of poly(styrene-ran-butadiene) SBR/polyisoprene or SBR/polybutadiene was investigated by time-resolved light scattering. Changes in the scaled structure factor F(x,t)≡qm(t)3I(x,t) with x≡q/qm(t) were determined as a function of the composition w of the mixture and of the phase separation temperature T, where qm(t) is the wave number q at the peak position of the scattering intensity profile I(q,t) at time t. It was found that the later-stage SD for the off-critical mixture is divided into four stages: intermediate, pseudolate, transition, and pinning. The change in the structure factor F(x,t) at large x implied that the dynamical percolation-to-cluster transition occurs before the pinning stage.
Published Version
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