Lecture Aleksandra Nastasovic
|27 april 2007||FWN-Building 5118.-156, Nijenborgh 4, 9747 AG, Groningen|
|Speaker:||Dr. Aleksandra Nastasovic|
|Affiliation:||ICTM Center for chemistry, Belgrade, Serbia|
|Title:||Synthesis, characterization and application of macroporous copolymers|
|Date:||Fri Apr 27, 2007|
|Telephone:||+31 50 363 6867|
Functional copolymers could be obtained by copolymerization of monomers that already contain selective functional groups, or by additional modification of synthesized macroporous copolymer. The term macroporous copolymers refer to materials prepared in the presence of a pore forming agent (inert component, porogen), having a permanent well-developed porous structure even in the dry state. Crosslinked macroporous hydrophilic poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) [abbreviated poly(GMA-co-EGDMA)] is convenient for chemical modification due to the presence of reactive epoxy group in GMA molecule, which could easily be transformed into various functional groups, like iminodiacetate, thiol, dithiocarbamate azole and pyrazole, pyridine groups, etc. These products have proved very useful as adsorbents and column packings in gas chromatography (GC), supports for classical catalysts and enzymes, as well as for biotechnological and biomedical applications. Among other factors, the applicability of macroporous copolymers is very much influenced by their porosity.
In this lecture, the results of the extensive study on the synthesis, characterization and some aspects of application of the macroporous crosslinked copolymers based on GMA will be presented. The importance of the proper selection of inert component, crosslinking agent and the type of copolymerization reaction (suspension vs. copolymerization in bulk) for optimization of the porous structure (specific surface area, specific volume, pore diameter, pore size distributions) of the synthesized beads intended for use as functional copolymers will be discussed. The application of amino-functionalized macroporous poly(GMA-co-EGDMA) samples for heavy and precious metals sorption will be illustrated. Initial and amino-functionalized samples were characterized by scanning electron microscopy, mercury porosimetry (determination of porosity parameters) and inverse gas chromatography (determination of Lewis acid/base properties and surface free energy dispersive components).
|Laatst gewijzigd:||22 oktober 2012 14:30|