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Synthesis Of Polymeric Nanocomposites In Supercritical Carbon Dioxide, Hongta Yang
Synthesis Of Polymeric Nanocomposites In Supercritical Carbon Dioxide, Hongta Yang
Theses
Supereritical carbon dioxide has been of great interest in various areas of chemical science and engineering during the last decade. In this thesis, the properties of poly (methyl methacrylate) (PMMA)/silica nanocomposites with different surfactant and filler concentrations synthesized through in-situ polymerization in supercritical carbon dioxide were investigated. In addition, ferromagnetic nano-particles were synthesized and functionalized for the preparation of nanocomposites. The thermal stability and surface morphology of PMMA/iron oxide nanocomposites synthesized in supercritical carbon dioxide were first studied in the work.
The scanning electron microscopy micrographs show that higher surfactant concentration results in higher number density of polymeric nanocomposite particles …
Modification Of Clays With Ionic Liquids For Polymer Nanocomponents, Neung Hyun Kim
Modification Of Clays With Ionic Liquids For Polymer Nanocomponents, Neung Hyun Kim
Theses
In attempts to prepare nanofillers with enhanced compatibility with a polymer matrix, cationic and anionic clays susceptible to exchange of their interlamellar ions with a variety of other cations or anions, were selected.
In order to treat cationic clay, montmorillonite, which contains sodium ions as interlayer ions, reagents having cations differing in size and structure included three ionic liquids ([EMIM]+ [Br]-, [HXMIM]+ [Cl]-, and [Epty]+ [BF4]-). Results indicated that cationic exchange did occur from aqueous solution as confirmed by FTIR, EDX, WAXS, TGA, and elemental analysis. WAXS indicated a significant increase …