聚合物交联反应诱导相分离过程的光散射二维相关分析研究

采用二维相关分析技术对聚醚砜(PES)/环氧树脂/二(2,6-二甲基苯胺基)甲烷体系的相分离过程的光散射数据进行了分析研究. 分析结果表明二维光散射分析可以提供一维光散射较难得到的信息: 在该体系相分离的演化过程早期, 即扩散控制期内, 体系中较小尺寸相区的粗大化早于较大的相区. 在相分离的中后期, 较小尺寸的富集相因碰撞融合产生更大尺寸相区的变化优先于较大尺寸相区的粗大化过程. 其原因可能是: 一方面这种增长方式比较有利于体系的能量较快地降低, 另一方面是在相分离的中后期界面运动导致的流动作用影响不容忽视.

A Two-Dimensional Time Resolved Light Scattering Study on Polymerization-Induced Phase Separation Process

The generalized two-dimensional correlation analysis based on time-resolved light scattering (2D TRLS) has been employed to study the phase separation of an epoxy-amine-PES blend, with the evolu- tion time of phase separation process as the internal stimulus. The results of the 2D TRLS correlation spec- tral analysis can provide more detail information not readily observed in the 1D scattering light spectra. i) In the early-stage of phase separation, namely, the diffusion regime, the coarsening in size of the smaller do- main takes place earlier than that of the bigger ones. ii) In the late-stage of phase separation (the hydrody- namic regime), the size change of the smaller domains due to collision and coalescence to each other takes place firstly, making the larger ones increase in size due to the hydrodynamic flow. The results suggest that the system prefer to obey in the upper method to decrease the system energy quickly.