Bulk spinodal decomposition studied by atomic force microscopy and light scattering
Bulk spinodal decomposition studied by atomic force microscopy and light scattering
复制标题
DOI：
10.1021/ma0017743
复制
发表时间：
2001-05-22
期刊：
影响因子：
5.5
通讯作者：
Magonov, SN
中科院分区：
文献类型：
--
作者：
Cabral, JT;Higgins, JS;Magonov, SN
我们报告的第一个观察到的散装调幅分解聚合物共混物使用原子力显微镜（AFM）。四甲基双酚A聚碳酸酯（TMPC）和聚苯乙烯（PS）的相分离的厚膜的断裂示出诱导的表面粗糙度，是可分辨的AFM。由此产生的地形再现的spinodal形态，并进行定量分析。我们同时调查的TMPC/PS膜，共混物已知表现出表面定向的调幅分解的表面和体积。从BD-FFT的“散装”AFM图像和时间分辨光散射（LS）得到的结构因子不一致，这是讨论的二维（AFM）和三维（LS）分析。最后，我们计算一般表达式相关的2D和3D结构因子的一些结构相关的相分离现象。
We report the first observation of bulk spinodal decomposition in polymer blends using atomic force microscopy (AFM). The fracture of a phase-separated thick film of tetramethyl bisphenol A polycarbonate (TMPC) and polystyrene (PS) is shown to induce a surface roughness that is resolvable by AFM. The resulting topography reproduces the spinodal morphology and is analyzed quantitatively. We investigate simultaneously the surfaces and bulk of the TMPC/PS films, a blend known to exhibit surface-directed spinodal decomposition. The structure factors obtained from a BD-FFT of "bulk" AFM images and from time-resolved light scattering (LS) do not coincide-this is discussed in terms of the 2D (AFM) and 3D (LS) analysis involved. We finally compute general expressions relating 2D and 3D structure factors for a number of structures relevant to phase separation phenomena.