Iron-Mediated Homogeneous ICAR ATRP of Methyl Methacrylate under ppm Level Organometallic Catalyst IronIII AcetylacetonateReportar como inadecuado




Iron-Mediated Homogeneous ICAR ATRP of Methyl Methacrylate under ppm Level Organometallic Catalyst IronIII Acetylacetonate - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China





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Academic Editor: Nicolay V. Tsarevsky

Abstract Atom Transfer Radical Polymerization ATRP is an important polymerization process in polymer synthesis. However, a typical ATRP system has some drawbacks. For example, it needs a large amount of transition metal catalyst, and it is difficult or expensive to remove the metal catalyst residue in products. In order to reduce the amount of catalyst and considering good biocompatibility and low toxicity of the iron catalyst, in this work, we developed a homogeneous polymerization system of initiators for continuous activator regeneration ATRP ICAR ATRP with just a ppm level of iron catalyst. Herein, we used oil-soluble iron III acetylacetonate Feacac3 as the organometallic catalyst, 1,1′-azobis cyclohexanecarbonitrile ACHN with longer half-life period as the thermal initiator, ethyl 2-bromophenylacetate EBPA as the initiator, triphenylphosphine PPh3 as the ligand, toluene as the solvent and methyl methacrylate MMA as the model monomer. The factors related with the polymerization system, such as concentration of Feacac3 and ACHN and polymerization kinetics, were investigated in detail at 90 °C. It was found that a polymer with an acceptable molecular weight distribution Mw-Mn = 1.43 at 45.9% of monomer conversion could be obtained even with 1 ppm of Feacac3, making it needless to remove the residual metal in the resultant polymers, which makes such an ICAR ATRP process much more industrially attractive. The -living- features of this polymerization system were further confirmed by chain-extension experiment. View Full-Text

Keywords: ICAR ATRP; organometallic catalyst; Feacac3 ICAR ATRP; organometallic catalyst; Feacac3





Autor: Jian Wu, Xiaowu Jiang, Lifen Zhang * , Zhenping Cheng * and Xiulin Zhu

Fuente: http://mdpi.com/



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