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lxhlxh052c(金币+10, 翻译EPI+1): 2010-05-06 08:34:58
Recently developed hyperbranched molecules compose a novel type of organic polymers, which form a hot host-guest study focus due to their intramolecular cavity, modifiable surfactant end-groups and good solubility. Hyperbranched molecules have shown potentials in applications such as medicinal release, catalysis, fiber dying, sensor etc. Vitor et al. describe a self-assembled structure formed via electro-static interactions in their study on dendrimeric encapsulated catalysts. The macromolecules, densely packed hydrophobic groups at periphery, can dissolve in non-polar solvent, and can extract organic molecules from water phase to non-polar phase by combining the organic molecules with their dendrimeric structures. Sunder has reported that hyperbranched molecules can successfully capture small molecules, which are water soluable but insoluable in organic solvents (e.g. Chloroform etc.) , into their cavities. By this way, hyperbranched molecules can load small molecular dyes. Currently, small molecule loading hyperbranched molecules are mainly Poly(glyc-erols[5]、Poly(ester amide) [6], Poly(ethyleneimine) [7], etc.
In this work, dodeca-amine is used as the starting material, reacting with methyl acrylate through Michael addition and ethylenediamine through amide condensation, respectively. The product, hyperbranched molecule R12-1.0G, has chain alkanes at one terminal and hypobranched structure at the other end. The structured is characterizated. Furthermore, it self-assembles with lauric acid by eletro-static interactions, which forms peripherally hydrophobic self-assembled macromolecules. The macromolecules are used as hosts to study phase transition of the Congo red under the influences of the mass ratio of lauric acid over toluene and concentration of R12-1.0G. As hyperbranched molecules do not require purification, easy to synthesize and can self-assemble, they are promising organic materials in dye-containing waste water treatment.
[ Last edited by c111999 on 2010-5-6 at 04:48 ] |
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