基板界面对PS/PMMA溶液共混物溶剂挥发成膜相结构的影响

研究了PS PMMA的共混物溶液溶剂蒸发成膜时的基板界面效应 .利用扫描电子显微镜 (SEM)研究了PS PMMA(5 5 ) (W W) THF高分子共混物溶液在不同基板上通过溶剂挥发成膜的相形态结构 .通过FTIR及ATR FTIR检测了共混物薄膜及其表面的共混组成 .研究结果表明 ,成膜基板对高分子共混物溶液成膜后的相形态有很重要的影响 .控制共混物溶液体系成膜过程中的动力学因素 ,可以调控出所设想的各种复杂的相结构形态

MORPHOLOGY OF SOLUTION CAST PS/PMMA BLEND FILMS

The PS/PMMA blend films were prepared by volatizing the solvent very slowly from the PS/PMMA/THF solution.Various substrates were employed such as glass,PET film,PTFE film and PP film.The SEM pictures showed that the morphologies of both the surface-side (contact with air) and the bottom-side (contact with the substrate) of the film strongly depend on the substrates used.If the substrate was glass or PET films,there were a small amount of PS particles on the bottom-side of the films.On the other hand,a lot of large PS particles could be observed on the bottom-side of the films when PTEF films or PP films were used as substrates.ATR-FTIR analysis was used to detect the composition at the surface side and the bottom side of the blend films.Substrate-segregation was found.It was supposed that this effect might be resulted from the different affinity of PS to the various substrates.