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  本文選題：表面引發(fā)自由基聚合 + 聚離子液體�。� 參考：《西北師范大學》2011年碩士論文

【摘要】：潤濕性是材料表面的重要特征之一。影響材料表面潤濕性的主要因素有:材料表面能、表面粗糙度以及表面微細結構,其中低表面能材料是制備超疏水性的基本條件,表面粗糙度和表面微細結構是決定性因素。尋求和制備高表面自由能或低表面自由能的固體表面成為制備超親水和超疏水的前提條件。 本文以季銨鹽型離子液體為研究對象,利用自由基聚合方法在固體硅片表面制備了微納米結構的聚離子液體刷,對硅片表面潤濕性進行了改性。 1.對離子液體的種類、物理化學性質(zhì)及其應用研究進展進行了綜述,簡要介紹了常見的活性自由基聚合方法在材料改性中的應用。 2.合成了季銨型離子液體單體烯丙基三乙基六氟磷酸銨,利用表面引發(fā)反向原子轉(zhuǎn)移自由基聚合(Surface initiate reverse atom transfer radical polymerization)方法,以CuCl_2/Bpy/AIBN作為催化體系,將其接枝于硅片表面,制得了聚合季銨型離子液體刷。利用凝膠滲透色譜儀(GPC)、橢圓偏光儀、靜態(tài)接觸角測定儀、傅里葉變換衰減紅外光譜(ATR-FTIR)、X射線光電子能譜(XPS)、原子力顯微鏡(AFM)對聚合物分子量,聚合物膜等進行了表征。結果表明,聚合離子液體膜表面的潤濕性與離子液體的種類及取代基碳鏈長度密切相關。 3.通過氮氧自由基聚合法,在硅片表面成功聚合了ADMBA-Cl離子液體。結果表明,此種離子液體修飾的硅片表現(xiàn)出親水性,通過氮氧自由基聚合法在硅片表面制備的聚離子液體薄膜與原子轉(zhuǎn)移自由基聚合法制得的薄膜,表面形貌有很大不同,后者空隙較大,表面呈現(xiàn)均勻而致密的刷型,稱之為聚合物刷,而前者表面空隙非常小,表面致密而且平整,可以將其稱為聚合物膜。 4.通過表面引發(fā)原子轉(zhuǎn)移自由基聚合或表面引發(fā)反向原子轉(zhuǎn)移自由基聚合,將ATEA-PF_6,VBTEA-PF_6,ADMBA-PF_6,和VBDMBA-PF_6四種季銨型離子液體,自組裝在硅片表面。結果表明,聚合離子液體刷表面的靜態(tài)水接觸角因離子液體種類的不同而不同。
[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.
【學位授予單位】：西北師范大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：O631.3

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本文編號：1770682