Nishino Takashi, Urushihara Yoshimasa, Meguro Masashi, Nakamae Katsuhiko
Department of Chemical Science and Engineering, Faculty of Engineering, Kobe University, Rokko, Nada, Kobe 657-8501, Japan.
J Colloid Interface Sci. 2005 Mar 15;283(2):533-8. doi: 10.1016/j.jcis.2004.09.041.
The surface free energy of diblock copolymer, composed of methyl methacrylate and 2-perfluorooctylethyl methacrylate (PMMA-b-PFEMA), was compared with that of PFEMA homopolymer (P-PFEMA) in correlation with their structures in the solid state and in the solution using dynamic contact angle, X-ray photoelectron spectroscopy, X-ray diffraction, and dynamic light scattering. The PMMA-b-PFEMA film cast from chloroform solution was found to possess very low surface free energy (7.8 mJ/m(2)) compared with the surface free energies of the P-PFEMA (8.5 mJ/m(2)) and the PMMA-b-PFEMA (9.8 mJ/m(2)) films cast from CF(3)CF(2)CHCl(2) solutions. These differences in the surface free energy were brought about by the variations in their surface structures. The very low surface free energy was considered to have originated from the surface segregation of the PFEMA segments highly self-assembled by the presence of chloroform.
使用动态接触角、X射线光电子能谱、X射线衍射和动态光散射，将由甲基丙烯酸甲酯和甲基丙烯酸2-全氟辛基乙酯组成的二嵌段共聚物（PMMA-b-PFEMA）的表面自由能与其固态和溶液状态下的结构相关联，与PFEMA均聚物（P-PFEMA）的表面自由能进行比较。发现从氯仿溶液浇铸的PMMA-b-PFEMA薄膜与从CF(3)CF(2)CHCl(2)溶液浇铸的P-PFEMA（8.5 mJ/m(2)）和PMMA-b-PFEMA（9.8 mJ/m(2)）薄膜相比，具有非常低的表面自由能（7.8 mJ/m(2)）。这些表面自由能的差异是由其表面结构的变化引起的。极低的表面自由能被认为源于氯仿的存在使PFEMA链段高度自组装而导致的表面偏析。
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