Two-step phase separation of a polymer mixture. II. Time evolution of structure factor

摘要: Nonlinear time evolution of phase-separating structures in the two-step phase separation process was investigated for a deuterated polybutadiene–polyisoprene mixture by using time-resolved light scattering technique. The studied has lower critical solution temperature type diagram with spinodal 36 °C. first-step via decomposition (SD) conducted jump (T-jump) from 23 °C to 42 °C, and late stage SD varying periods, t0, order develop phase-separated domains characteristic size Λm,1. This followed second-step T-jump higher 70 °C so that each domain is again quenched into thermodynamically unstable region. processes after were explored as function initial We found following intriguing effects str...