超临界二氧化碳退火增强氟化嵌段共聚物的表面疏水性

Surface hydrophobicity of fluorinated block copolymers enhanced by supercritical carbon dioxide annealing.

作者信息

Yokoyama Hideaki, Sugiyama Kenji

机构信息

Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1, Higashi, Tsukuba, Ibaraki 305-8565, Japan.

出版信息

Langmuir. 2004 Nov 9;20(23):10001-6. doi: 10.1021/la0495231.

DOI:10.1021/la0495231

PMID:15518486

Abstract

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.

摘要

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。