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Synthesis and Characterization of Novel Fluorinated Amphiphilic Copolymers and Their Applications

Author: MaoJiang
Tutor: NiPeiHong
School: Suzhou University
Course: Polymer Chemistry and Physics
Keywords: Oxygen anionic polymerization Self-assembly Amphiphilic graft block polymer Fluoropolymer Hyperbranched polymers Block polymer Multiphase separated micellar Miniemulsion Macromolecular emulsifier Dynamics Hyperbranched Poly (3 - ethyl-3 - (hydroxymethyl) oxetane ) Methyl acrylate, 2 - (dimethylamino ) ethyl methacrylate Methacrylic acid octafluoropentyl ester
CLC: O631
Type: Master's thesis
Year: 2007
Downloads: 239
Quote: 1
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Abstract


The contents of the thesis consists of two main parts: the first part of the study the use of the oxygen anionic polymerization synthesis of a series of fluorinated amphiphilic hyperbranched graft block copolymer, and to study the self-assembly behavior of these copolymers in different solvents; The second part of the study using oxygen anionic polymerization synthesis linear fluorinated amphiphilic block polymers, and this as macromolecular emulsifier stable styrene miniemulsion prepared surface with fluorinated polymer nano-micro segment ball. The first part: the synthesis of fluorinated amphiphilic hyperbranched graft block copolymer self-assembly in this section study the self-assembly of a new fluorinated hyperbranched graft copolymer in acidic water and mixed solvents. Hyperbranched poly (3 - ethyl - 3 - (hydroxymethyl) oxetane) as a macromolecular initiator, using the order of feeding method sequentially added hydrophilic monomers methyl methacrylate, 2 - (dimethylamino) ethyl methacrylic esters (DMAEMA) and fluorine-containing monomers - (2,2,3,3,4,4,5,5 - octafluoro) pentyl ester (OFPMA), the polymerization process 1 the the H NMR Tracking characterization and 19 F NMR and GPC test results show that the oxyanion initiated polymerization successfully synthesized hyperbranched polyether nuclear diblock polymer arm star polymers . The fluorine-containing amphiphilic hyperbranched graft block polymer is dissolved in acidic water (pH 3.0) and from DMF / Water (pH3.0) mixed solvent of white assembly, through a transmission electron microscope (TEM), NMR 1 H NMR and dynamic laser light scattering characterization methods to study the self-assembly behavior of the polymer, the experimental results show that such polymers can be self-assembled under certain conditions, to become a multi-phase-separated micelles, and multiphase separated plastic The beam size With growth of PDMAMEA segment becomes small. Especially in the mixed solvent, PDMAEMA segment to grow to a certain length, the corresponding the Hyperbranched graft copolymer also can be self-assembled nanowire become linear. At the same time, by electrophoresis instrument of self-assembled solution validation tests, the experimental results proved once again that the micelles multiphase separated micelles. Part II: Synthesis of fluorine-containing amphiphilic triblock polymers and their use as emulsifiers in the miniemulsion in applications utilizing a method of polymerization by the oxygen anion, with benzyl alcohol as the initiator, the use of sequential feeding method sequentially added hydrophobic single body of methyl methacrylate (MMA), the hydrophilic monomer methyl acrylate, 2 - (dimethylamino) ethyl methacrylate (DMAEMA), and fluorine-containing monomers methyl methacrylate - (2,2,3,3,4 4,5,5 - octafluoro) pentyl ester (OFPMA). By magnetic resonance imaging ( 1 H NMR, 19 F NMR), gel permeation chromatography (GPC) of polymer structure, molecular weight, molecular weight distribution is characterized, results show that the oxygen anionic polymerization of the success of the synthesis of a series of structural and purified a narrow molecular weight distribution of the fluorine-containing amphiphilic triblock polymers. An aqueous solution of the polymer, the surface tension test results show that such a polymer in an aqueous solution showed significant surfactant characteristics. Therefore, such triblock polymer as an emulsifying agent for the stabilization of styrene miniemulsion, the power under the miniemulsion reaction kinetics study of emulsifier, under different pH conditions and different emulsifiers school comparison. Were characterized by transmission electron microscopy (TEM), particle size test, zeta potential test and infrared testing on the morphology and structure of the latex particles. The results show that the amphiphilic fluorinated triblock polymer as an emulsifier can be well adsorbed on the styrene latex particle surface, the formation of microspheres of the polystyrene particles as the nucleus, the fluorinated emulsifier of the \. The emulsion is coated on the film and the surface of the contact angle measurements, the results once again proved by the success of such the fluorinated emulsifier stable styrene miniemulsion synthetic surface with a fluorine-containing segment \sphere.

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