【摘要】 本文用激光光散射技术研究了高分子混合体系聚甲基丙烯酸甲酯/(苯乙烯-丙烯腈)共聚物(PMMA/PSAN)不稳相分离(Spinodal decomposition)过程,结果指出,相分离前期符合Cahn理论预言的结果;首次用光散射技术在高分子混合体系相分离研究中得到了不稳相分离增长速率最大值R(q_m);只(q)的实验结果与理论值相吻合;证实了界面自由能对相分离增长速率的影响是不可忽略的。更多还原

【Abstract】 Early stage of phase separation by spinodal decomposition in mixtuer of poly (methyl methacryate) (PMMA) and poly (styrene-co-acrylonitrile) (PSAN) was investigated with time-resolved light sacttering. The results indicate that the spinodal decomposition at early stage follows Cahn’s linearized theory. The Maximum growth rate Rmax of phase separation has been revealed for the first time by time resolved light scattering. The theoretical R(q) is in agreement with the experimental one. Therefore, the interficial free energy can not been ignored in expression of R(q).更多还原