Kong X, Xie X, Yang R, Wang K, Zhang Z, Lei H
Department of Chemical Engineering, Tsinghua University, 100084 Beijing.
Guang Pu Xue Yu Guang Pu Fen Xi. 2000 Oct;20(5):623-5.
In this paper, PS/PC blend film (about 120 microns thick) and PS/PMMA (about 90 microns thick) blend film were prepared by evaporation the solvent very slowly from polymer blend solution. Different FTIR methods were used to determine the composition distribution along the vertical direction of the films. PS/PC film was firstly sectioned by ultramicrotomy, then the vertical section was measured to determine the composition of every 16 microns width unit from the surface-side to the bottom-side by Microscopic transmission-FTIR. The results showed that the concentration of PS was significantly greater in the vicinity of the surface of the film than that in the bulk, i.e., the component of PS enriched to the surface. Focusing the reflecting infrared light on different layer of the film, we can detect the composition of the different depth region in the PS/PMMA blend film. As the result, PMMA aggregated to the bottom of the film. It was considered that this effect was related to the different affinity and wetting prosperities of the blend component to the substrate or air.
在本文中，通过从聚合物共混溶液中非常缓慢地蒸发溶剂来制备PS/PC共混膜（约120微米厚）和PS/PMMA（约90微米厚）共混膜。使用不同的傅里叶变换红外光谱（FTIR）方法来确定沿膜垂直方向的组成分布。首先通过超薄切片术对PS/PC膜进行切片，然后通过显微镜透射傅里叶变换红外光谱测量垂直切片，以确定从表面侧到底部每16微米宽度单元的组成。结果表明，膜表面附近的PS浓度明显高于本体中的浓度，即PS组分富集到表面。将反射红外光聚焦在膜的不同层上，可以检测PS/PMMA共混膜中不同深度区域的组成。结果是，PMMA聚集到膜的底部。据认为，这种效应与共混组分对基材或空气的不同亲和力和润湿性有关。
