Kim Ginam, Sousa Alioscka, Meyers Deborah, Shope Marilyn, Libera Matthew
Dow Corning Corporation, Science and Technology, Midland, Michigan 48640, USA.
J Am Chem Soc. 2006 May 24;128(20):6570-1. doi: 10.1021/ja061377t.
Using valence electron energy loss spectroscopy (EELS) in the cryo-scanning transmission electron microscopy (STEM), we found that the polymer-polymer interface in two-phase nanocolloids of polydimethyl siloxane (PDMS) and copolymer (methyl acrylate (MA)-methyl methacrylate (MMA)-vinyl acetate (VA)) preserved in water was diffuse despite the fact that equilibrium thermodynamics indicates it should only be on the order of a few nanometers. The diffuse interface is a result of the kinetic trapping of the copolymer within the PDMS phase, and this finding suggests new nonequilibrium pathways to control interfaces during the synthesis of multicomponent polymeric nanostructures.
在低温扫描透射电子显微镜（STEM）中使用价电子能量损失谱（EELS），我们发现保存在水中的聚二甲基硅氧烷（PDMS）和共聚物（丙烯酸甲酯（MA）-甲基丙烯酸甲酯（MMA）-醋酸乙烯酯（VA））的两相纳米胶体中的聚合物-聚合物界面是弥散的，尽管平衡热力学表明其应该仅在几纳米的量级。这种弥散界面是共聚物在PDMS相中的动力学捕获的结果，并且这一发现为多组分聚合物纳米结构合成过程中控制界面提供了新的非平衡途径。
