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lxhlxh052c木虫 (著名写手)
小木虫之无虫
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帮帮忙啊，急用！！！
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超支化分子是近年来发展起来的一类新型有机高分子，由于分子内空穴、可修饰的表面端基及良好的溶解性，已成为主客体化学研究的热点之一，并在药物释放、催化剂、纤维染色、传感器等方面显示出了良好的应用前景[3]。Victor等[4]在研究树枝状包裹型催化剂的同时，描述了一种通过静电力自组装树枝状大分子的结构，这种具有稠密的疏水性外围基团的大分子，能溶解于非极性溶剂，并能将水溶性的有机分子通过与树枝状大分子结合，从水相转移到非极性溶剂中去。Sunder[5]报道超支化分子可以成功地将不溶于氯仿等有机溶剂的水溶性小分子染料捕捉到聚合物的孔穴中，实现对小分子染料的装载。目前用于装载小分子的超支化聚合物主要有Poly(glyc-erols[5]、Poly(ester amide) [6]和Poly(ethyleneimine) [7]等。 本文以十二胺为原料，与丙烯酸甲酯、乙二胺分别进行迈克尔加成反应和酰胺化缩合反应，合成了一种一端具有长链烷基，另一端具有低支化结构的超支化有机物R12-1.0G，在对产物进行结构表征的同时，将其与月桂酸进行静电力自组装，得到了具有疏水性外围的自组装大分子，在以自组装大分子为宿主，研究了月桂酸与甲苯的质量比、R12-1.0G浓度对染料刚果红的相转移行为的影响规律。由于超支化分子的合成无需纯化，工艺简单，自组装分子无需合成，所以这类有机物在处理含染料废水方面具有潜在的应用前景[8]。 求高手帮忙，真的着急用，要不然也不用来这求助了，谢谢了，最好专业一点！！！ |
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lxhlxh052c(金币+10, 翻译EPI+1): 2010-05-06 08:34:58
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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 ] |
2楼2010-05-06 04:43:30
lxhlxh052c
木虫 (著名写手)
小木虫之无虫
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3楼2010-05-06 08:34:49
