Dissertation > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials

Surface Modification of Oxide Nanoparticles by Polymers and Its Effect on the Polyacrylate Nanocomposites Coatings

Author LiuFuShengCong
Tutor XiaoHanNing
School Hunan University
Course Materials Science
Keywords Nano-oxide Polyacrylate Coating Polymer adsorption Dispersion Thermal degradation Photodegradation Gallery rub wear
Type PhD thesis
Year 2005
Downloads 458
Quotes 6
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The nano-oxide dispersed in the media is a key issue in the nano-particle synthesis and applications. Add polymer nanoparticle colloidal material system so that adsorption on the particle surface is to prevent an effective method of nano-particle agglomeration growth. They are achieved by changing the size of the static electricity or steric effects the dispersion stability of the nano-oxide particles. This paper is to study the evaluation of nano-oxide Department of colloidal material dispersion stability and the possible mechanism by changing the type of polymer and dispersion conditions. And nano-oxide dispersed in the the polyacrylate emulsion into the preparation of nano-oxide / polyacrylate composite coatings, nano-oxide coating thermal degradation, light degradation, as well as under water lubrication, friction and wear. FTIR and assay results show that: the non-ionic polymer of PEG and PAM mainly through hydrogen bonding is formed on the oxide surface adsorption; anionic polymers PAA and PMAN adsorption can be achieved through hydrogen bonding and chemical bonding, specifically which adsorption gravitational dominant status mainly depends on the pH value; the cationic polymer MPTMAC mainly by electrostatic forces in nano-SiO 2 surface adsorption; amphoteric polymer electrolyte PMAA-b-PDMAEMA in TiO 2 surface adsorption is the result of the role of hydrogen bonding, chemical bonding and electrostatic. This paper systematically studied various polymers in the adsorption behavior of nano-oxide surface and polymer concentration, polymer relative molecular weight relative relationship between factors such as pH, ionic strength and type of dispersion system. The different types of polymer adsorbed amount and thickness of the adsorbed layer showing a different variation, from the angle of the polymer chain in the form of oxide surface adsorption to interpret them. Polymer adsorption isotherm curves approximate Langmuir adsorption model. Polymer average Relative Relative increase in molecular weight of the polymer saturated adsorption amount increases. Different for different types of polymers, pH value on the adsorption behavior. Changes in the ionic strength of less influence on the amount of adsorption of non-ionic polymer, and the polymer electrolyte is adsorbed more sensitive to the ionic strength and type. The polyelectrolyte adsorption amount is rendered with the changes in the ionic strength of the maximum value. The multicharged ions polyelectrolyte polymer chain to play a bridging role in promoting the increase in the amount of adsorption. Different alkali metal ions affect the adsorption behavior of the polymer with the oxide surface affinity. Nano oxide adsorbing polymer, particle surface charge density, ζ potential and electric double layer structure will be changed. Hou Nami oxide adsorption of non-ionic polymer isoelectric point is almost constant, while the adsorption of anionic or cationic polyelectrolyte, the isoelectric point of the oxide, etc. is moved to the direction of low or high pH, ??moving distance, and the polymer concentration Relative Relative and average molecular weight related. Polyampholyte adsorption on the zeta potential of the nano-oxide the polymer pH iep showing a different variation of the demarcation point. This paper, the dispersion stabilizing effect of the different types of polymers in an aqueous medium nanometer oxide. PEG and PAM mainly through the dispersion stability of nano-oxide steric hindrance. In the 10 4 magnitude range, the average relative relative molecular weight of bigger and more conducive to dispersion stability, polymer initial concentration in

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