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Preparation of Poly(Ionic Liquid) Brushes with Controllable Wettability Via Surface-Initiated Radical Polymerization

Author: HeXiaoJing
Tutor: YangWu；GaoJinZhang
School: Northwest Normal University
Course: Analytical Chemistry
Keywords: Surface-initiated radical polymerization The polyion liquid brush Controllable wettability Living / controlled polymerization Copper base Silicon substrate
CLC: O631.5
Type: Master's thesis
Year: 2010
Downloads: 84
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Abstract


Surface wettability is one of the important characteristics of the solid surface, all the plant life activities, the human daily life and work, agricultural production has an important impact on the nature dynamic. Is well known that the surface wettability of the solid surface free energy and the size of the surface roughness determined. Build on superhydrophobic materials have a lot of research is beginning to mature, but dynamic controllable nature of the surface of the design study has just started, controlled surface wettability dynamic reversible super-hydrophobic / super-hydrophilic material to make an accurate and predictable changes and regulation to external stimuli, stimuli-responsive devices, self-cleaning surfaces, liquid microspheres manipulator zoom lens has great application potential, therefore, to seek easy to operate, easy to industrial promotion, film stability, structure and roughness controllable, reversible good super-hydrophobic / super-hydrophilic reversible conversion material is still the most challenging issues in the surface of Materials Science. The control surface wettability methods are many, such as a mechanical surface morphology changes of the law, it is achieved by controlling the surface roughness of the wettability of the regulation, the wetting performance by changing the surface free energy to control material mainly by material surface coated or grafted organic polymer layer by controlling the composition of the organic polymer layer to achieve the wettability of the regulation. Surface grafting method through the combination of a strong chemical bond End-grafted polymer layer formed in the surface of the substrate concern. Wherein the surface initiator of radical polymerization reaction can be formed in the surface of the solid substrate a high degree of orientation, with a solid, high-density polymer layer, the thin film layer is uniformly distributed the graphical micro satisfied and a molding process, and the film thickness at the molecular level easily. regulation, which greatly broadens the field of application of the polymer. Poly (ionic liquid) due to its structural characteristics, become one of the preferred structural units to achieve the surface wettability reversible adjust, to initiate polymerization on the surface functional ionic liquid unit is introduced into the surface of the material, and then by selecting the appropriate ion to adjust the surface of the material The wettability changes. In this paper, the surface of the radical polymerization reaction, authorize the introduction of the type in the type of material the surface of the substrate poly (ionic liquid), and then through the conversion of hydrophilic and hydrophobic ion-exchange solid surface. These new wettability controllable functional materials rarely reported, and has broad application prospects. First synthesized a new ionic liquid monomer is allyl triphenyl phosphonium hexafluorophosphate, 1 - (4 - vinylbenzyl -) -3 - butyl-imidazol-hexafluoro phosphate ionic liquid monomer synthesized according to the literature salt, and were characterized by nuclear magnetic resonance spectroscopy and other technical means. 1 - (4 - vinylbenzyl)) -3 - butyl-imidazol-hexafluoro-phosphate monomer, 2 - bromo-2 - methyl-N-(3 - (trimethoxy silicon substrate) propyl) propionamide surface initiator, SmCl3 as a catalyst, the lactic acid as a ligand, AIBN as a radical initiator, DMF as the solvent, ionic liquids grafted poly brush the surface of the copper base utilization RATRP law; allyl triphenyl phosphonium hexafluorophosphate as the monomer, 2 - bromo-2 - methyl-N-(3 - (triethoxysilyl) propyl)-propionamide (BTPAm) initiator to the surface, TEMPO nitroxide free radical initiator agent, cyclohexanone as solvent, the use of the the surface initiator NMP law ionic liquids grafted poly brush the surface of the silicon substrate; monomer of 1 - (4 - vinylbenzyl)) -3 - butyl imidazolium hexafluorophosphate 2 - bromo-2 - methyl-N-(3 - (triethoxysilyl) propyl) propionamide surface initiator, TEMPO, a nitroxide free radical initiator, and xylene as the solvent, the use of NMP method grafted poly (ionic liquid) brush the surface of the silicon substrate. X-ray photoelectron spectroscopy (XPS), contact angle meter, ellipsometry, atomic force microscopy (AFM), nuclear magnetic resonance spectroscopy (1H and 13C NMR) and gel permeation chromatography (GPC) they were characterized. Kinetics studies showed that, regardless of the use of either method, the thickness of the polymer brushes with increasing polymerization time a linear relationship, thus proving the polyion the liquid brush the surface of the material increases is controllable active polymerization. In addition, through a simple anion exchange, the successful implementation of the reversible conversion of the material surface hydrophobicity.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > Polymerization,polycondensation reaction
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