聚甲基丙烯酸甲酯乳胶膜在溶剂退火过程中的结构演变

Evolution of PMMA Latex During Solvent Annealing Process

通过乳液聚合的方法得到了单分散的聚甲基丙烯酸甲酯(PMMA)乳胶分散液,利用小角X射线散射技术得到乳胶分散液中乳胶颗粒的粒径以及粒径分布.PMMA乳胶分散液在硅片上成膜后,利用椭偏仪和扫描电子显微镜研究了其在2种溶剂退火过程中的膜厚以及结构变化.干燥后的PMMA乳胶膜在相对良溶剂丙酮的溶剂退火过程中存在粒子的形变及溶胀2个过程,而在相对不良溶剂乙醇的溶剂退火过程中仅存在粒子的溶胀过程.

A mono-dispersed poly （methyl methacrylate ） （PMMA） latex dispersion was synthesized by emulsion polymerization. Small angle X-ray scattering technique was applied to determine the particle size and size distribution of the PMMA latex dispersion. The PMMA latex film was prepared by casting the diluted dispersion on a silicon substrate. Spectroscopic ellipsometer and scanning electron microscope were used for the investigation of the thickness and structure variations of the prepared latex film during two kinds of solvent annealing processes. When the PMMA latex film was annealed in the relatively good solvent vapor, such as acetone, there were two processes during solvent annealing： particle deformation and swelling. And when the PMMA latex was annealed in relatively poor solvent vapor, such as ethanol, there was only one process： the swelling process.