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Synthesis of Amphiphilic Graft Copolymer Containing PEO Segment and Its Surface Properties

Author: ZhaoYan
Tutor: YangWanTai;SunYuFeng
School: Beijing University of Chemical Technology
Course: Polymer Chemistry and Physics
Keywords: Amphiphilic graft copolymer Surface morphology Surface composition Water contact angle
CLC: O631
Type: Master's thesis
Year: 2004
Downloads: 402
Quote: 4
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The amphiphilic copolymer due to the characteristics of its structure, showing the unique nature of the selective solvent, surface and body structure. It's the study of history is not long, but many people research hot spots such as nano-materials (LB film), LCD (side-chain polymer liquid crystal), biomaterials, drug delivery and separation membranes, polymer alloy (compatibilizer ), EOR flocculant and the binder in the chemical industry, emulsion polymerization and dispersion polymerization indispensable emulsifying and dispersing agent, with the amphiphilic copolymer is closely related. Therefore, the amphiphilic copolymer has become the object of chemistry, medicine, physics, life sciences, interdisciplinary research. Mainly the surface properties of the amphiphilic copolymer amphiphilic graft copolymer: changes due to the external environment of each component alignment, and the occurrence of surface self-assembly to form a microporous membrane material; under the action of a solvent, the surface properties of the copolymer film, surface morphology, and composition aspect few reports, in particular the use of a mixed solvent of the amphipathic graft copolymer molecular aggregation changes in order to achieve the surface properties of the copolymer film the conversion from hydrophobic to hydrophilic, this aspect of the study has novelty. In this thesis macromonomer synthesis amphiphilic graft copolymer PS-g-NPEO and PMMA-g-NPEO amphiphilic graft copolymer solution film-forming, change has been a series of different membrane casting conditions The structure of the copolymer film. IR, UV, NMR, XPS, SEM, CA testing means of amphiphilic graft copolymer structure and its copolymer film lt; WP = of 4 gt; infiltration of surface morphology, composition, and surface properties were characterized preliminary clarify the copolymer film surface morphology, composition and wettability. PS-g-NPEO system, the amphipathic graft copolymer may be formed under different conditions, the rules of the surface micropores in the copolymer NPEO the higher the content, the greater the pore size of the membrane surface of the resulting copolymer, the corresponding surface of the membrane The smaller the contact angle with water; THF as the solvent cast films, the greater the concentration of the film formation, the greater the pore size of the surface of the copolymer film, corresponding to a water contact angle smaller; toluene as a solvent, the film concentration on copolymerization was little effect on the film surface morphology, and becomes gradually large as corresponding to the increase in the concentration of the film-water contact; under the same film-forming concentration, with toluene as the solvent to prepare the copolymer film has better hydrophilicity; the two of a toluene solution of the pro-graft copolymer formed on the different substrates (BOPP and PET), the surface properties of the copolymer film having a great difference in the concentration of the solution is small, the BOPP film, the surface is very smooth and no micropores , ATR-FTIR infrared test results showed that the surface functional groups of weak intensity, corresponding to the water contact angle is larger, while the PET film, the surface of the large number of micropores, the higher levels of surface hydrophilic component, which corresponds to the contact angle with water than small, when the solution concentration is large, the base film for the surface morphology of the copolymer composition, and the surface wettability is not; under different concentration conditions, two different types of graft copolymer film (PS-g-Mpeo and PS-g-NPEO) surface morphology, consistent with the change trend of the composition and surface water wetting properties, but the film surface of the PS-g-NPEO larger pore size, pore darker, corresponding to a water contact angle is smaller. PMMA-g-NPEO system with NPEO content increases, the water of the copolymer film contact becomes gradually small, of NPEO body content of 38%, the water contact angle of less than 10 °, to form a super-hydrophilic copolymer film; with chloroform as solvent deposition, PMMA-g-NPEO micro-phase separation did not occur, the different concentrations casting a water contact angle of the film of the copolymer film did not much Movies LT; WP = 5 GT; ring; while in THF solvent, with the change in the concentration, PMMA-g-NPEO can be self-assembled to form the pattern of a variety of morphologies; PMMA-g-NPEO30-10 in THF mother liquor was added a different co-solvent, can be a series of different water contact angle of the copolymer film; With the improvement of the co-solvent precipitation, the increase in particle size of the composition copolymer membrane, the specific surface area decreases, the surface of the hydrophilic component is gradually increased, improvement of wetting properties. When the When precipitated worst ethanol, water contact angle of 125 °, the best water precipitated as co-solvent, the surface showed that the super-hydrophilic, the water contact angle is close to 0 °, this study is the change material The wettability provide an easy way.

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