Ultra-hydrophobic sticky polymer surfaces formed by water-induced surface deformation

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• 作者：Eun-Ho Sohn^a ; ¹ ; Byoung Gak Kim^a ; ¹ ; Hyunkee Hong^b ; Da-Jung Sohn^b ; Jong-Chan Lee^b ; ^{jongchan@snu.ac.kr}
• 关键词：Ultra-hydrophobic sticky polymer surface ; Poly(oxyethylene)s with alkyl thioether side chains ; Water-induced surface deformation ; Poly(methyl methacrylte) ; Polymer blend
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：490
• 期：Complete
• 页码：84-90
• 全文大小：2547 K
• 卷排序：490

文摘

Surface properties of poly(oxyethylene)s with alkyl thioether side chains (CH3-nTE; n = carbon atoms in the side chain) were investigated. CH3-nTEs having shorter side chains (n = 6, 8, 10) did not have ordered structures, while those with longer chains (n = 12, 14) showed well-ordered, lamellar structures with side chain crystalline domains. Accordingly, CH3-12TE and CH3-14TE film surfaces were much more enriched with hydrophobic alkyl side chains than CH3-8TE and CH3-10TE surfaces. However, CH3-12TE and CH3-14TE films had smaller water contact angles (≈114°) than CH3-8TE and CH3-10TE films (>130°). This unexpected behavior is ascribed to the formation of very rough CH3-8TE and CH3-10TE film surfaces (Rrms > 100 nm) on contact with water. The CH3-10TE/poly(methyl methacrylate) (PMMA) surfaces also showed high water contact angles (>125°), even with low CH3-10TE content (30 wt%), because the CH3-10TE moiety roughened the surfaces. Furthermore, ultra-hydrophobic sticky behavior was observed for CH3-nTEs (n = 8, 10) and CH3-10TE/PMMA surfaces.