Salt-Responsive Zwitterionic Polymer Brushes with Tunable Friction and Antifouling Properties

详细信息    查看全文

• 作者：Jintao Yang ; Hong Chen ; Shengwei Xiao ; Mingxue Shen ; Feng Chen ; Ping Fan ; Mingqiang Zhong ; Jie Zheng
• 刊名：Langmuir
• 出版年：2015
• 出版时间：August 25, 2015
• 年：2015
• 卷：31
• 期：33
• 页码：9125-9133
• 全文大小：499K
• ISSN：1520-5827

文摘

Development of smart, multifunction materials is challenging but important for many fundamental and industrial applications. Here, we synthesized and characterized zwitterionic poly(3-(1-(4-vinylbenzyl)-1H-imidazol-3-ium-3-yl)propane-1-sulfonate) (polyVBIPS) brushes as ion-responsive smart surfaces via the surface-initiated atom transfer radical polymerization. PolyVBIPS brushes were carefully characterized for their surface morphologies, compositions, wettability, and film thicknesses by atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), contact angle, and ellipsometer, respectively. Salt-responsive, switching properties of polyVBIPS brushes on surface hydration, friction, and antifouling properties were further examined and compared both in water and in salt solutions with different salt concentrations and counterion types. Collective data showed that polyVBIPS brushes exhibited reversible surface wettability switching between in water and saturated NaCl solution. PolyVBIPS brushes in water induced the larger protein absorption, higher surface friction, and lower surface hydration than those in salt solutions, exhibiting 鈥渁nti-polyelectrolyte effect鈥?salt responsive behaviors. At appropriate ionic conditions, polyVBIPs brushes were able to switch to superlow fouling surfaces (<0.3 ng/cm² protein adsorption) and superlow friction surfaces (u 鈭?10^鈥?). The relationship between brush structure and its salt-responsive performance was also discussed. This work provides new zwitterionic surface-responsive materials with controllable antifouling and friction capabilities for multifunctional applications.