Layer structure estimation of three-dimensional crystal and two-dimensional molecular film for fluorinated comb copolymers
Layer structure estimation of three-dimensional crystal and two-dimensional molecular film for fluorinated comb copolymers
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DOI：
10.1002/polb.21387
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发表时间：
2008-03
期刊：
影响因子：
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通讯作者：
A. Fujimori;Hiroko Hoshizawa;Satoshi Kobayashi;K. Kanai;Y. Ouchi;K. Seki
中科院分区：
文献类型：
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作者：
A. Fujimori;Hiroko Hoshizawa;Satoshi Kobayashi;K. Kanai;Y. Ouchi;K. Seki
使用丙烯酸或甲基丙烯酸单体以多种比例进行共聚制备了同时含有氢化和氟化侧链的梳型共聚物。通过广角 X 射线衍射 (WAXD)、小角 X 射线散射 (SAXS) 和面外 X 射线衍射研究了这些共聚物的晶体结构及其有序分子膜的层结构。此外，为了选择性地估计较短碳氟化合物侧链的规律性，通过偏振近边 X 射线吸附精细结构 (NEXAFS) 光谱研究了共聚物的有序分子膜。从这些测量结果推断，除了具有极高碳氟化合物含量的共聚物外，这些共聚物形成高度有序的层结构，并且长间距主要由氢化侧链的排列决定。在有序分子膜的情况下，甲基丙烯酸酯共聚物的氟化侧链不能形成高度有序的排列，而丙烯酸酯共聚物的氟化侧链在单层上取向。然而，在这两种情况下，氢化侧链主要在有序薄膜中形成层结构，而氟化侧链对层结构的形成没有贡献。 © 2008 Wiley periodicals, Inc. J Polym Sci B 部分：Polym Phys 46：534–546，2008
Comb copolymers containing both hydrogenated and fluorinated side-chains were prepared by copolymerization using acrylic or methacrylic monomers in several ratios. The crystal structures of these copolymers and layer structures of their organized molecular films were investigated by wide-angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS), and out-of plane X-ray diffraction. Further, to selectively estimate the regularity of shorter fluorocarbon side-chains, organized molecular films of copolymers were investigated by polarized near-edge X-ray adsorption fine structure (NEXAFS) spectroscopy. From the results of these measurements, it was inferred that these copolymers formed highly ordered layer structures, and a long spacing was predominantly determined by the arrangement of hydrogenated side-chains, except in copolymers having extremely high fluorocarbon contents. In the case of the organized molecular films, the fluorinated side-chains of methacrylate copolymers cannot form a highly ordered arrangement, whereas those of acrylate copolymers were oriented on monolayers. However, in both cases, the hydrogenated side-chains predominantly formed layer structures in the organized films, and the fluorinated side-chains did not contribute to the formation of the layer structures. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 534–546, 2008