New approach to aqueous biphasic catalysis through catalyst confinement in nanoscopic core-shell polymers / Si Chen  

Public ISBD Titre : New approach to aqueous biphasic catalysis through catalyst confinement in nanoscopic core-shell polymers Type de document : texte imprimé Auteurs : Si Chen, Auteur ; Rinaldo Poli, Directeur de thèse ; Manoury, Eric, Directeur de thèse Langues : Anglais (eng) Tags : CORE-SHELL POLYMERS  CATALYTIC NANOREACTORS  MACROMOLECULAR  RAFT - BIPHASIC CATALYSIS  EMULSION POLYMERIZATION  HYDROFORMYLATION PISA Résumé : "The catalytic processes are at the heart of chemical industry. Modern chemical industry, under pressure of stricter regulations and societal concern, is faced with the need to improve efficiency and cleaner production processes and catalysis is one the major keys to green chemical technology. Catalysts recovery is necessary from an economic and environmental point of view when it makes use of expensive and / or toxic metals. The aim of this thesis is based on an innovative approach related to micellar catalyst but in which the catalyst is covalent linked to the hydrophobic core of well-defined unimolecular, core-cross-linked micelles. The synthetic protocol is based on a convergent method via RAFT-mediated one-pot aqueous emulsion polymerization. The efficiency of these unimolecular micelles as catalytic nanoreactors has been shown using the industrially relevant hydroformylation of 1-octene, in order to provide a proof of principle, as a test reaction yielding turnover frequencies and l/b ratio comparable to those of related homogeneous systems. However, the catalyst phase could be easily separated from the organic product phase and recycled. A remarkable protecting effect of the active catalyst by the polymer scaffold has also been demonstrated. The absence of the coagulation at the end of reaction is evidence that these new objects function as micelles while eliminating the disadvantages of micellar catalysis such as the formation of stable emulsion." Document : Thèse de Doctorat Etablissement_delivrance : Université Toulouse 3 Date_soutenance : 28/09/2015 Ecole_doctorale : Sciences de la matière (SdM) Domaine : Chimie Moléculaire, industrielle, polymères En ligne : http://thesesups.ups-tlse.fr/2906/ New approach to aqueous biphasic catalysis through catalyst confinement in nanoscopic core-shell polymers [texte imprimé] / Si Chen, Auteur ; Rinaldo Poli, Directeur de thèse ; Manoury, Eric, Directeur de thèse . - [s.d.]. Langues : Anglais (eng) Tags : CORE-SHELL POLYMERS  CATALYTIC NANOREACTORS  MACROMOLECULAR  RAFT - BIPHASIC CATALYSIS  EMULSION POLYMERIZATION  HYDROFORMYLATION PISA Résumé : "The catalytic processes are at the heart of chemical industry. Modern chemical industry, under pressure of stricter regulations and societal concern, is faced with the need to improve efficiency and cleaner production processes and catalysis is one the major keys to green chemical technology. Catalysts recovery is necessary from an economic and environmental point of view when it makes use of expensive and / or toxic metals. The aim of this thesis is based on an innovative approach related to micellar catalyst but in which the catalyst is covalent linked to the hydrophobic core of well-defined unimolecular, core-cross-linked micelles. The synthetic protocol is based on a convergent method via RAFT-mediated one-pot aqueous emulsion polymerization. The efficiency of these unimolecular micelles as catalytic nanoreactors has been shown using the industrially relevant hydroformylation of 1-octene, in order to provide a proof of principle, as a test reaction yielding turnover frequencies and l/b ratio comparable to those of related homogeneous systems. However, the catalyst phase could be easily separated from the organic product phase and recycled. A remarkable protecting effect of the active catalyst by the polymer scaffold has also been demonstrated. The absence of the coagulation at the end of reaction is evidence that these new objects function as micelles while eliminating the disadvantages of micellar catalysis such as the formation of stable emulsion." Document : Thèse de Doctorat Etablissement_delivrance : Université Toulouse 3 Date_soutenance : 28/09/2015 Ecole_doctorale : Sciences de la matière (SdM) Domaine : Chimie Moléculaire, industrielle, polymères En ligne : http://thesesups.ups-tlse.fr/2906/

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