表面引发自由基聚合法制备聚离子液体刷

发布时间：2018-04-19 00:07

本文选题：表面引发自由基聚合 + 聚离子液体　；参考：《西北师范大学》2011年硕士论文

【摘要】：润湿性是材料表面的重要特征之一。影响材料表面润湿性的主要因素有:材料表面能、表面粗糙度以及表面微细结构,其中低表面能材料是制备超疏水性的基本条件,表面粗糙度和表面微细结构是决定性因素。寻求和制备高表面自由能或低表面自由能的固体表面成为制备超亲水和超疏水的前提条件。本文以季铵盐型离子液体为研究对象,利用自由基聚合方法在固体硅片表面制备了微纳米结构的聚离子液体刷,对硅片表面润湿性进行了改性。 1.对离子液体的种类、物理化学性质及其应用研究进展进行了综述,简要介绍了常见的活性自由基聚合方法在材料改性中的应用。 2.合成了季铵型离子液体单体烯丙基三乙基六氟磷酸铵,利用表面引发反向原子转移自由基聚合(Surface initiate reverse atom transfer radical polymerization)方法,以CuCl_2/Bpy/AIBN作为催化体系,将其接枝于硅片表面,制得了聚合季铵型离子液体刷。利用凝胶渗透色谱仪(GPC)、椭圆偏光仪、静态接触角测定仪、傅里叶变换衰减红外光谱(ATR-FTIR)、X射线光电子能谱(XPS)、原子力显微镜(AFM)对聚合物分子量,聚合物膜等进行了表征。结果表明,聚合离子液体膜表面的润湿性与离子液体的种类及取代基碳链长度密切相关。 3.通过氮氧自由基聚合法,在硅片表面成功聚合了ADMBA-Cl离子液体。结果表明,此种离子液体修饰的硅片表现出亲水性,通过氮氧自由基聚合法在硅片表面制备的聚离子液体薄膜与原子转移自由基聚合法制得的薄膜,表面形貌有很大不同,后者空隙较大,表面呈现均匀而致密的刷型,称之为聚合物刷,而前者表面空隙非常小,表面致密而且平整,可以将其称为聚合物膜。 4.通过表面引发原子转移自由基聚合或表面引发反向原子转移自由基聚合,将ATEA-PF_6,VBTEA-PF_6,ADMBA-PF_6,和VBDMBA-PF_6四种季铵型离子液体,自组装在硅片表面。结果表明,聚合离子液体刷表面的静态水接触角因离子液体种类的不同而不同。
[Abstract]:Wettability is one of the important characteristics of material surface.The main factors affecting the wettability of the materials are: surface energy, surface roughness and micro-structure, among which the low surface energy material is the basic condition for the preparation of superhydrophobicity, and the surface roughness and micro-structure are the decisive factors.Seeking and preparing solid surfaces with high surface free energy or low surface free energy is a prerequisite for the preparation of superhydrophilic and superhydrophobic surfaces.In this paper, quaternary ammonium salt ionic liquids were used to prepare polyionic liquid brushes with microstructures on the surface of solid silicon wafers by free radical polymerization, and the wettability of silicon wafers was modified.1.The kinds, physical and chemical properties of ionic liquids and their applications are reviewed. The applications of common methods of active radical polymerization in material modification are briefly introduced.2.A quaternary ammonium triethylhexafluorophosphate monomer, allyl triethyl hexafluorophosphate, was synthesized. Surface initiate reverse atom transfer radical polymerization was prepared by surface initiation of reverse atom transfer radical polymerization. CuCl_2/Bpy/AIBN was used as catalyst system to graft it onto the surface of silicon wafer.A polymeric quaternary ammonium ionic liquid brush was prepared.The molecular weight of polymer and polymer membrane were characterized by gel permeation chromatography (GPC), ellipsometer, static contact angle analyzer, Fourier transform attenuated infrared spectroscopy (FTR-FTIR), X-ray photoelectron spectroscopy (XPS) and atomic force microscope (AFM).The results show that the wettability of polymeric ionic liquid membranes is closely related to the species of ionic liquids and the length of substituent carbon chains.3.ADMBA-Cl ionic liquids were successfully polymerized on the surface of silicon wafers by nitrogen-oxygen radical polymerization.The results show that this kind of ionic liquid modified silicon wafer exhibits hydrophilic properties. The surface morphology of the polyionic liquid film prepared by nitrogen-oxygen radical polymerization method is different from that prepared by atomic transfer radical polymerization.The latter has a large void and a uniform and compact surface, which is called polymer brush, while the former has a very small void, compact and smooth surface, which can be called polymer film.4.Through surface-initiated atom transfer radical polymerization or surface initiated reverse atom transfer radical polymerization, ATEA-PF6VBTEA-PF6AMBA-PF6 and VBDMBA-PF_6 four quaternary ammonium ionic liquids were self-assembled on the surface of silicon wafers.The results show that the static water contact angle on the surface of polymeric ionic liquid brush varies with the type of ionic liquid.
【学位授予单位】：西北师范大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：O631.3

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