【作者】 宋文龙；

【导师】 刘凤岐； 江雷；

【作者基本信息】 吉林大学 ， 高分子化学与物理， 2007， 博士

【摘要】 浸润性是固体表面的一个重要特征,它是由物质表面的化学组成和微观几何结构所共同决定的。因此,应用外部刺激对物质表面的化学组成或微观结构进行调节,从而实现对表面浸润性的智能控制就越来越受到研究者的广泛关注。本文中,应用原子转移自由基聚合方法,将具有热响应性聚合物(如聚异丙基丙烯酰胺和聚异丙基甲基丙烯酰胺)和电响应性聚合物(如聚2-丙烯酰胺基-2-甲基丙基磺酸)分别接枝到不同基底上,通过温度和电场的调控实现了对这些聚合物膜表面静态和动态浸润性以及微观浸润性的控制。其中将聚异丙基丙烯酰胺接枝到具有独特分级的微纳复合结构的铜网模板表面上,通过温度控制实现了对铜网膜表面上水渗透这一动态过程的响应性控制,该结果进一步加深了固体表面的微纳米复合结构对其动态浸润过程理解。应用导电原子力显微镜技术,实现了对电响应聚2-丙烯酰胺基-2-甲基丙基磺酸膜表面微观浸润性的控制,同时,该膜表面的粘滞力也可以通过带负电的原子力针尖进行方便的调节。另外,应用模板覆盖法制备了类似壁虎腿结构的聚异丙基丙烯酰胺和聚苯乙烯混合物的纳米吸盘阵列结构,并通过对温度的控制实现了对该膜上浸润性和黏附力的调节。研究外部刺激对响应性聚合物膜表面的宏观和微观浸润性的影响具有重要的科学意义,在智能纳米器件、可控微流体器件、信息存储器件的制造、智能液体传输和微量液体测试方面具有广泛的应用前景。更多还原

【Abstract】 Stimuli-responsive surfaces can react to the external stimuli, and have been realized by various elegant methods, which play an important role in industrial applications including chemical sensors, microfluidic devices, and so on. And wettability is an important property of solid surfaces that governed by both chemical composition and surface topographic structure. Therefore it is attracted great interests on controling the wettability by adjusting the chemical composition or surface topographic structure with external stimuli.In this paper, we successfully fabricated various responsive wettable surface with thermal responsive polymer, for example: poly(N-isopropylacrylamide) and poly(N-isopropylmethacrylamide), and the electrical responsive polymer, for example: Poly(2-acrylamide-2-methylpropane sulfonic acid), which the responsive macro- and micro-wettability, and adhesion force were investigated in detail, respectively.1 The rough copper mesh film with special hierarchical micro- and nanostructures is fabricated by ammonia oxidation method, then it is modified with the poly(N-isopropylacrylamide) by atom transfer radical polymerization(ATRP), which is a novel thermal responsive polymer. A temperature controllable water permeation process was realized on it. This research will help us to understand not only the static wettability on the surface, but also, most important, the dynamic properties of the micro- and nanostructure enhanced responsive wettability.2 A roughness-enhanced two-grade thermal responsive wettable film consisted with the poly(N-isopropylmethacrylamide)-block-poly(N-isopropylacrylamide) (PNIPMAM-b-PNIPAm) was fabricated on the silicon substrate by ATRP. And detailed AFM investigation indicated that the adhesion forces on such surface were also incresing with the temperature, which showed a two-grade force rundle just like the CA change. And the suitable sized micro- and nanostructure on the substrate plays an important role in this effect. The excellent property of two grade responsive wettability on the surface is very useful in various important applications including controllable protein separation, microfluidic devices, medicine release, and so on.3 Using a templated method, a superhydrophobic polymer nanoacetabula surface was fabricated, which is composed of the mixture of poly(N-isopropylacrylamide) and polystyrene. And the high adhesion force on the film can be controlled by the temperature. The aligned superhydrophobic nanoacetabula film like gecko’claw can be greatly applicated in smart liquid transportion and micro-sample analysis systems.4 Poly(2-acrylamide-2-methylpropane sulfonic acid) which can exhibit an extent of volume change under external electric field was grafted on the silicon substrate. Using conducting AFM, the microscopic wettability and the adhesion force was investigated, and the results indicated they can be conveniently triggered by a negatively charged AFM tip. It may be applicated in the smart nanodevice, controlled microfluid device, data recording device, and so on.更多还原