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Preparation and Recognition Property of Molecularly Imprinted Mesoporous Silica Polymer

Author: MaZuoTian
Tutor: WangYan
School: Harbin Institute of Technology
Course: Physical and chemical
Keywords: covalently molecular imprinted polymer noncovalent molecular imprintedpolymer mesoporous organosilica SBA-15,2,2-bis(4-hydroxyphenyl) propane
CLC: O631.3
Type: Master's thesis
Year: 2012
Downloads: 59
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Abstract


Molecular imprinting can be defined as the assembly of a cross-linked polymer matrix around an imprint molecule that is held in place, either covalently or noncovalently, by judiciously chosen functional monomers. Prepared mesoporous silica materials with promising structural properties for an imprinting matrix, as their rigid structures are highly suitable for the formation of a delicate recognition site in the thin wall. In addition, their high pore volume and nanosized pore wall thickness guarantee the generation of recognition sites in the wall and thereby offer high accessibility for atarget molecule.Prepared the molecularly imprinted mesoporous silica polymer was prepared by non-covalent method and the recognition property were researched. Chose bisphenol A (BPA) as the imprint molecule template bond to functional3-aminopropyl triethoxysilane monomer with hexagonally structured mesoporous silica(MCM-41)as the non-covalent imprinting matrix prepared by one step method(co-condensation method) and two step method(grafting method). The structure and performances were characterized by FT-IR, XRD, and target rebinding test. The results showed that:the non-covalent imprinting materials prepared by co-condensation method have exhibited much higher recognition ability, the maximum apparent adsorbance was8.899mg/g.Prepared the molecularly imprinted mesoporous silica polymer was also prepared by covalent method and the recognition property were researched. Chose bisphenol A (BPA) as the imprint molecule bond to the functional (3-isocyanatopropyl) triethoxysilane monomer to generate a covalently bound imprint precursor. This precursor was incorporated into a cross-linked periodic mesoporous silica matrix via a typical acid-catalyzed, structure-directing surfactant, sol-gel synthesis. After the thermally reversible urethane bond dissociated at high temperatures to extract the template, the covalent-BPA-imprinted mesoporous organosilica particles were prepared. Evidence of imprint sites buried in the pore walls was found through characterization of the covalent imprinted material and its comparison to similarly prepared non-imprinted mesoporous organosilica.The target rebinding test was carried out and careful comparison of the rebinding properties of non-covalent imprinted material with MCM-41matrix and the covalent imprinted material with MCM-41matrix to discuss the difference of the properties.we found that:The covalent imprinted material with MCM-41matrix had spend6h to recognize BPA with the maximum apparent adsorbance was7.384mg/g. Careful comparison of the rebinding properties of covalent imprinted material with SBA-15and MCM-41matrix, we found that:The mesoporous silica matrix have shown a rapid kinetic uptake. The covalent imprinted materials with SBA-15matrix exhibited much higher recognition ability and the recognition time was much faster than the covalent imprinted materials with MCM-41matrix, an complete equilibrium quickly reached within5hour with the maximum apparent adsorbance was18.58mg/g.In addition, the combination of molecule imprinted technology and solid phase extraction (MIP-SPE) has been one of the most promising development aspects of molecule imprinted technology in these years. We use the BPA-covalent imprinted material with SBA-15matrix as solid phase extraction sorbent and investigated the application of it.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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