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Study of Particles-stabilized Emulsion and High Internal Phase Emulsion

Author: LiTingTing
Tutor: LiuHuaRong
School: University of Science and Technology of China
Course: Polymer Chemistry and Physics
Keywords: Pickering emulsions Seed emulsion Radiation Polymerization High internal phase emulsion Macroporous materials
CLC: O648.23
Type: Master's thesis
Year: 2011
Downloads: 205
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Abstract

With the development of nanotechnology, nano-particles in the oil - water interface adsorption behavior and a stable emulsion more and more people's attention, but now people for such Emulsion is not perfect. In this thesis, we first synthesized a novel amphiphilic polymer particles, to stabilize the emulsion for research; then synthesized a AOA-modified magnetic nanoparticles, and high internal phase emulsion for study. The specific content of the work is summarized as follows: 1. Synthesized by reverse-phase microemulsion of poly (stearyl methacrylate-co-acrylamide-co-acrylic acid), such particles hydrophilic internal and external hydrophobic, oil-soluble by adjusting the ratio of monomer and water-soluble monomer, particles can easily improve the wettability. The above styrene polymer particles are used to stabilize the phase emulsion system, after the polymerization of the size distribution we obtain a more uniform sub-micron polystyrene microspheres. Through research we found during the preparation of the emulsion, the emulsion will form the beginning of Pickering emulsions; but with time, the gradual disappearance of large droplets, swollen polymer particles may be, falling off, a seed balls, namely Pickering emulsions occurs to change the seed emulsion; inorganic particles and this is the difference between the emulsion stability. 2 by coprecipitation magnetic nanoparticles and a 12 - acryloyl-9 - octadecenoic acid (AOA) its surface modification, the modified magnetic particles for St-DVB high internal phase emulsion (HIPE) preparation and polymerization. AOA structure contains the activated double bond, the AOA-modified magnetic particles (MPs) can participate in the polymerization, to further improve the emulsion stability and the bonding strength; Moreover, the addition of the polymer magnetic particles play a reinforced porous materials effect. We studied the MPs and the internal water phase content of the concentration of the high internal phase emulsion stability and structure of the porous material. The results show that when the particle concentration of 20%, the Young's modulus of the material reaches the maximum value (69.7 MPa), compressive strength is also increased to 5.29 MPa. Meanwhile, the material pore size also increases with the particle density gradually decreases and the size of the uniform trend. However, increasing the water phase content of the material may result in decreased mechanical properties, density is reduced, pore size is increased, but is conducive to the formation of a porous structure through. (3) We also studied at room temperature and the γ-ray radiation induced thermal initiator at 60 ° C when the high internal phase emulsion polymerization, the surfactant Span 80 concentration on the emulsion stability and morphology of the porous material structure. The results showed that at room temperature, the emulsion polymerization is conducive to the stability, and when the amount of surfactant is reduced to 1.4 wt%, still get a good porous polymeric macroporous materials through.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Colloid chemistry ( physical and chemical dispersion system ) > Crude dispersion system > Emulsion
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