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Issue 7, 2007
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A novel approach to the synthesis of SiO2–PVAc nanocomposites using a one-pot synthesis in supercritical CO2

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Abstract

Inorganic–polymer nanocomposites are of significant interest for emerging materials due to their improved properties and unique combination of properties. A novel one-step synthesis route has been developed for making the polymer nanocomposites silica–poly(vinyl acetate) (SiO2–PVAc) in supercritical CO2 (scCO2), wherein all raw chemicals, tetraethoxysilane (TEOS)/tetramethoxysilane (TMOS), vinyltrimethoxysilane (VTMO), vinyl acetate, initiator, and hydrolysis agent were introduced into one autoclave. In-situ ATR-FT-IR was applied to monitor the process in scCO2, and the parallel reactions of free radical polymerization, hydrolysis/condensation, and linkage to the polymer matrix, were found to take place. The nanocomposites were also studied by transmission electron microscopy (TEM) and EDX element Si-mapping. Well-dispersed nanoparticles of 10–50 nm were formed. This process provides a significant improvement by providing a one-step synthesis route where the potentially recyclable scCO2 works as a solvent, a modification agent, and a drying agent. This green process has potentially many advantages in producing new and unique materials, along with waste-reduction and energy-saving properties. Production of metal-oxidepolymer nanocomposites from non-inhalable liquid precursors also has significant potential for non-toxicity in biomedical and other fields.

Graphical abstract: A novel approach to the synthesis of SiO2–PVAc nanocomposites using a one-pot synthesis in supercritical CO2

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Publication details

The article was received on 05 Dec 2006, accepted on 12 Feb 2007 and first published on 07 Mar 2007


Article type: Paper
DOI: 10.1039/B617634H
Citation: Green Chem., 2007,9, 768-776
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    A novel approach to the synthesis of SiO2–PVAc nanocomposites using a one-pot synthesis in supercritical CO2

    P. A. Charpentier, W. Z. Xu and X. Li, Green Chem., 2007, 9, 768
    DOI: 10.1039/B617634H

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