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Preparation of Nanosize Silica and Its Composite Polymer Emulsion

Author: DaiJianHua
Tutor: XuShen
School: Tianjin University
Course: Materials Science
Keywords: Nano-silica Reverse Microemulsion Silicon simple substance Surface Modification Composite emulsion
CLC: TB383.1
Type: Master's thesis
Year: 2005
Downloads: 854
Quote: 6
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Abstract


The nano surface modified reverse microemulsion method and elemental silicon legal system in this article were used to prepare the dispersion of nano-silica , surface modified silica particles with a silane coupling agent , and equipment to silicon elemental legal system , silica nano-silica synthetic seed / polymer composite emulsion . Nonylphenol polyoxyethylene ether ( NP -5 ) / cyclohexane / ammonia inverse microemulsion system was successfully prepared by the hydrolysis and condensation reactions of TEOS monodisperse nano silica particles . Reaction time , TEOS concentration , ammonia concentration of the product of nano-silica production and particle size . Use of the silane coupling agent is methacryloxypropyl trimethoxy silane (KH-570) has been surface modified to enhance the affinity between the organic phase with the product of nano-silica particles . Silicon single qualitative method successfully prepared nano-silica aqueous dispersion , the effects of reaction temperature , elemental silicon purity elemental silicon dosage , NaOH solution concentration and reaction time on the the product nano the silica yield , particle size and particle size distribution of impact . KH-570 on the silica particles subjected to a surface modification , infrared spectroscopy showed that the chemical grafting occurs between the coupling agent KH-570 with silica . To the aqueous dispersion of the surface-modified nano - silica as a seed, styrene and butyl acrylate as monomers, seed emulsion polymerization, nano silica / polymer composite emulsion . Composite emulsion infrared spectroscopy , ultraviolet spectrum , film , and transmission electron microscopy analysis showed that the chemical grafting between polymer and silica , the presence of nano - silica reinforced composite latex film formation of UV- shielding effect and the mechanical properties of the membrane .

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