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Polymer hollow microspheres synthesis and catalytic reaction

Author: LanYang
Tutor: ZhangWangQing
School: Nankai University
Course: Polymer Chemistry and Physics
Keywords: Polymer hollow microspheres Synthesis Carrier Microcapsules Nanoparticles Catalytic hydrogenation Two-phase reaction
CLC: O643.36
Type: Master's thesis
Year: 2010
Downloads: 165
Quote: 0
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Abstract


This paper begins with an overview of the synthesis and applications of polymer hollow microspheres . So far, there have been a number of hollow microspheres The method of preparing a polymer , polymer hollow microspheres in general synthetic method can be divided into a self-assembly method , an emulsion method , the template method , as well as industrial method . By these methods, the polymer scientists have synthesized a series of shapes and performance of different polymer hollow microspheres . These synthetic polymer hollow microspheres in drug storage and controlled release system , the protection of biological macromolecules , heterogeneous catalysts and building materials has broad application prospects . In this article , we use the template synthesis of polystyrene -co-poly (2 - acetoacetate ) methacrylate the Ethyl -co- polyacrylamide (PS-co-PAEMA-co-PAM) hollow microspheres . PS-co-PAEMA-co-PAM hollow microspheres having a diameter of 300nm, and a wall thickness of 50nm , and is mainly composed of three parts : 1) a hydrophilic PAM segment ; 2) with a chelating group , PS-co- PAEMA segments; 3) is formed of a hydrophobic cavity . This special structure of the PS-co-PAEMA-co-PAM hollow microspheres , it has three important properties : first , PS -co - PAEMA -co -PAM hollow microspheres can be used as a noble metal nanoparticle vector we load the Pd and Au nanoparticles in the synthesis of hollow microspheres ; second , PS -co - PAEMA -co -PAM hollow microspheres and load the noble metal nanoparticles hollow microspheres can be uniformly dispersed in a stable water in . Third , PS-co-PAEMA-co-PAM hollow microspheres also can be used as the adsorption of the micro- vesicles , small organic molecules enriched in the aqueous phase of its cavity . PS-co-PAEMA-co-PAM hollow microspheres of three important properties , the load of Pd nanoparticles PS - Co - PAEMA -co -PAM hollow microspheres as a micro-reactor in the aqueous phase chloro dehalogenation reaction of phenol catalytic hydrogenation and olefin catalytic hydrogenation reaction under the oil-water two- phase system . In the above two examples , the synthetic micro-reactor having a high catalytic activity . We will micro-reactor in such a high catalytic activity due to PS -co - PAEMA -co -PAM hollow microspheres can be used as microcapsule- adsorption and enrichment of the water of the solvent nature of the reaction substrates . Further, the synthetic micro-reactor is very stable, and recycling of the micro-reactor can be achieved by centrifugation or simple hierarchical remove .

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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