Phase separation kinetics in silica sol-gel system containing polyethylene oxide. I. Initial stage
Phase separation kinetics in silica sol-gel system containing polyethylene oxide. I. Initial stage
复制标题
含有聚环氧乙烷的二氧化硅溶胶-凝胶体系中的相分离动力学。
DOI：
10.1007/bf00486246
复制
发表时间：
1994
影响因子：
2.5
通讯作者：
N. Nemoto
中科院分区：
文献类型：
--
作者：
K. Nakanishi;Y. Yamasaki;H. Kaji;N. Soga;Tadashi Inoue;N. Nemoto
研究了含聚氧化乙烯（PEO）的烷氧基二氧化硅凝胶溶液的微区形成动力学。在微米尺度上对发生相分离的聚合溶液进行了时间分辨光散射测量。域形成过程中，导致各种尺寸的互连形态进行了检查，主要集中在初始阶段。对于所有样品，散射强度随时间呈指数增长，在最初的几十秒内在固定波数处形成单峰，这是旋节线分解的线性化区域的特征。基于Cahn提出的线性化理论的分析给出了溶胶-凝胶转变各阶段诱导相分离的动力学参数的合理描述。
Domain formation kinetics in gelling alkoxy-derived silica solutions containing polyethylene oxide (PEO) has been investigated. The time-resolved light scattering measurement was performed for the polymerizing solutions which underwent phase separation in the length scale of micrometer. Domain formation processes which resulted in various sizes of inter-connected morphology were examined, focusing mainly on the initial stage. For all the samples, the scattering intensity grew exponentially with time forming a single peak at a fixed wave-number in the first few tens seconds, which is the characteristic of the linearized regime of the spinodal decomposition. An analysis based on the linearized theory proposed by Cahn gave a reasonable description of the kinetic parameter of phase separation induced in various stages of the sol-gel transition.