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Surface-modification of Silica Carbide Nanoparticles Via Reverse Atom Transfer Radical Polymerization

Author: ZhaoShuFang
Tutor: SunXiaoRan
School: Hebei University of Technology
Course: Applied Chemistry
Keywords: SiC Nano Surface modification KH-570 Reverse atom transfer radical polymerization
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 32
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Abstract


Nanoparticles its ultra fine-grained, the surface energy is relatively large agglomerates, it is difficult to uniformly disperse in the matrix. To improve the surface properties of nanomaterials, surface modification and coating technology has become a key technology for the preparation and application of nanomaterials. Surface-initiated reverse atom transfer radical polymerization (RATRP) technology is a new type of controllable / activity of radical polymerization surface modification is to improve nanoparticle dispersion properties effective method. Dispersed according to of polymerization mechanism RATRP the nano-SiC in water Stability Mechanism, design and research of one kind of water media RATRP nano-SiC surface modified new method. First study of the nano SiC surface the introduction of RATRP active groups; explore the best technology of nano-SiC surface coupled Preparation of SiC-KH-570 KH-570; study were used CuCl2/O-phen and FeCl3 / PPh3 catalytic system triggered RATRP, the nano SiC surface modification. Discussed the nano SiC particles surface modification effect, through the activation of the index, the transmittance of the suspension, sedimentation height, Zeta potential, turbidity test and infrared spectroscopy IR, TG - differential thermal TG-DTA, X-ray diffractometer XRD, transmission electron microscopy TEM, field emission scanning electron microscope FESEM test technical analysis modified the the nano SiC surface material chemical composition, structural characteristics, thermal properties and its particle size, dispersion state and morphology; last compared RATRP and traditional radical polymerization modification effect of nano-SiC. The research results show that the best way to group the introduced RATRP activity is coupled to the introduction of the-C = C-double bond hydrolysis KH-570 nanometer SiC surface, in which the methanol and water as the solvent, KH-570 H2O molar ratio of 1:9, the hydrolyzate pH 6.2, hydrolysis time effect of hydrolysis time 1h best, and the coupling reaction in toluene as solvent, the reaction time is 7h; different catalytic system to determine surface-initiated RATRP modified nano-SiC the optimum conditions, the catalytic system is CuCl2/O-phen modified monomer add accounts for the mass fraction of SiC-KH-570 4% for AM, AM, AM / KPS 100, AM/CuCl2 to 150 AM / O-phen is 100, and the reaction medium is water. Modified by field emission scanning electron microscope to uniform particle size distribution of SiC the nano SiC agglomeration significantly improved, comparative tests show that with RATRP technology than conventional free radical polymerization modified nano the SiC dispersion stability improved significantly. Modification of nano-SiC RATRP dispersion stability mechanism by physical crosslinking and chemical crosslinking role in the formation of a layer of uniform chain length distribution of the KH-570-PAM polymer nano-SiC surface grafted controllable thickness of the electrolyte layer generating electrostatic stabilization and steric effect.

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