Yokoyama Hideaki, Sugiyama Kenji
Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1, Higashi, Tsukuba, Ibaraki 305-8565, Japan.
Langmuir. 2004 Nov 9;20(23):10001-6. doi: 10.1021/la0495231.
Supercritical carbon dioxide (scCO2) annealing enhances the hydrophobicity of the surfaces of asymmetric perfluorinated block copolymers. X-ray photoelectron spectroscopy (XPS) and contact angle measurement reveal that the surface domains of the fluorinated block (PF) of poly[styrene-block-4-(perfluorooctylpropyloxy)styrene] (PS-PF) become thicker than those annealed in a vacuum. Consequently, the contact angles of water on the surfaces of PS-PF block copolymers significantly increase after the scCO2 annealing compared to those annealed in a vacuum. The surface hydrophobicity enhanced by the scCO2 annealing is related to the thickness of the surface PF domain and the conformation of the PF block.
超临界二氧化碳（scCO2）退火增强了不对称全氟嵌段共聚物表面的疏水性。X射线光电子能谱（XPS）和接触角测量表明，聚[苯乙烯-嵌段-4-（全氟辛基丙氧基）苯乙烯]（PS-PF）中氟化嵌段（PF）的表面域比在真空中退火的更厚。因此，与在真空中退火的相比，scCO2退火后PS-PF嵌段共聚物表面的水接触角显著增加。scCO2退火增强的表面疏水性与表面PF域的厚度和PF嵌段的构象有关。
