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You searched for subject:(Sulfonated ionic liquids). Showing records 1 – 2 of 2 total matches.

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Virginia Tech

1. Gao, Renlong. Synthesis and Properties of Ion-Containing Block and Segmented Copolymers and Their Composites.

Degree: PhD, Chemistry, 2012, Virginia Tech

Ion-containing segmented polyurethanes exhibit unique morphology and physical properties due to synergistic interactions of electrostatic, hydrogen bonding, and hydrophobic interactions. A fundamental investigation on a series of well-defined ion-containing polyurethanes elucidated the influence of charge placement, charge density, and soft segment structure on physical properties, hydrogen bonding, and morphologies. An unprecedented comparison of poly(ethylene oxide)(PEO)-based sulfonated polyurethanes containing sulfonate anions either in the soft segments or hard segments revealed that sulfonate charge placement dramatically influenced microphase separation and physical properties of segmented polyurethanes, due to altered hydrogen bonding and thermodynamic immiscibility between soft and hard segments. Moreover, studies on sulfonated polyurethanes with identical sulfonated hard segments but different soft segment structures indicated that soft segment structure tailored sulfonated polyurethanes for a wide range of mechanical properties. Sulfonated polyurethanes incorporated with ammonium-functionalized multi-walled carbon nanotubes (MWCNTs) generated novel polyurethane nanocomposites with significantly enhanced mechanical performance. Modification of MWCNTs followed a dendritic strategy, which doubled the functionality by incorporating two ammonium cations per acid site. Complementary characterization demonstrated successful covalent functionalization and formation of surface-bound ammonium salts. Upon comparison with pristine MWCNTs, ammonium-functionalized MWCNTs exhibited significantly enhanced dispersibility in both DMF and sulfonated polyurethane matrices due to good solvation of ammonium cations and intermolecular ionic interactions between anionic polyurethanes and cationic MWCNTs. Segmented polyurethanes containing sulfonated PEO-based soft segments and nonionic hard segments were incorporated with various contents of room temperature ionic liquid, 1-ethyl-3-methylimidazolium ethylsulfate (EMIm ES), to investigate the influence of ionic liquid on physical properties, morphologies, and ionic conductivity. Results indicated that EMIm ES preferentially located in the sulfonated PEO soft phase, leading to significantly enhanced ionic conductivity and well-maintained mechanical properties. These properties are highly desirable for electromechanical transducer applications. Electromechanical actuators fabricated with sulfonated polyurethane/IL composite membranes exhibited effective response under a low applied voltage (4 V). However, in the case of an imidazolium-containing segmented polyurethane with imidazolium ionic hard segments and hydrophobic poly(tetramethylene oxide) (PTMO) soft segments, EMIm ES selectively located into the imidazolium ionic hard domains, as evidenced with a constant PTMO soft segment glass transition temperature (Tg) and systematically reduced imidazolium hard segment Tg. Dielectric relaxation spectroscopy demonstrated that ionic conductivity of imidazolium-containing segmented… Advisors/Committee Members: Long, Timothy E. (committeechair), Turner, S. Richard (committee member), Vlachos, Pavlos P. (committee member), Madsen, Louis A. (committee member), Moore, Robert Bowen III (committee member).

Subjects/Keywords: step-growth polymerization; multi-walled carbon nanotubes; sulfonated block copolymers; sulfonated polyurethane; nanocomposites; ionic liquids; electroactive actuator

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Gao, R. (2012). Synthesis and Properties of Ion-Containing Block and Segmented Copolymers and Their Composites. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/77334

Chicago Manual of Style (16th Edition):

Gao, Renlong. “Synthesis and Properties of Ion-Containing Block and Segmented Copolymers and Their Composites.” 2012. Doctoral Dissertation, Virginia Tech. Accessed November 12, 2019. http://hdl.handle.net/10919/77334.

MLA Handbook (7th Edition):

Gao, Renlong. “Synthesis and Properties of Ion-Containing Block and Segmented Copolymers and Their Composites.” 2012. Web. 12 Nov 2019.

Vancouver:

Gao R. Synthesis and Properties of Ion-Containing Block and Segmented Copolymers and Their Composites. [Internet] [Doctoral dissertation]. Virginia Tech; 2012. [cited 2019 Nov 12]. Available from: http://hdl.handle.net/10919/77334.

Council of Science Editors:

Gao R. Synthesis and Properties of Ion-Containing Block and Segmented Copolymers and Their Composites. [Doctoral Dissertation]. Virginia Tech; 2012. Available from: http://hdl.handle.net/10919/77334

2. Boulanger, Jérôme. Nouveaux systèmes catalytiques hétérogénéisés pour la synthèse d'esters d'isosorbide par hydroestérification : New heterogenized catalytic systems for the synthesis of isosorbide esters by hydroesterification.

Degree: Docteur es, Molécules et Matière Condensée, 2014, Université d'Artois

Des complexes à base de palladium (II) ont été appliqués comme catalyseurs pour la réaction d’hydroestérification de l’isosorbide, matériau biosourcé, avec le 1-octène. Dans un premier temps, l’utilisation de liquides ioniques standards a permis l’immobilisation du catalyseur (palladium + phosphine) et la conversion du 1-octène. L’activité catalytique est dépendante de la nature du liquide ionique. Le liquide ionique sulfoné bSmimAPTS a permis l’obtention de conversions élevées, avec des rendements en diesters importants sur trois cycles catalytiques tout en s’affranchissant de l’emploi d’acide paratoluènesulfonique. Le catalyseur (palladium + phosphine sulfonée) est immobilisé dans la phase liquide ionique. La régiosélectivité de la réaction peut être modifiée (85/15 contre 75/25 dans les conditions classiques) avec le remplacement de la TPPTS par une phosphine bidentate sulfonée (XANTPHOS sulfonée). Un système constitué de Pd(OAc)2/APTS/NBu4Br s’est également montré très efficace dans la conversion du 1-octène en diester d’isosorbide mais n’est pas très stable dans le temps (recyclé à deux reprises). Dans un second temps, l’utilisation de charbons actifs commerciaux a permis d’immobiliser le métal (après filtration à froid) tout en conservant une activité catalytique élevée. Il est possible de convertir le 1-octène en substituant l’APTS par un matériau carboné sulfoné (obtenu par voie hydrothermale en une étape entre le saccharose et l’acide sulfurique). Les synthèses, caractérisations et applications d’un matériau carboné nanorépliqué sulfoné de type CMK-3 ont été considérées. Le matériau carboné sulfoné (MC-NR-saccharose-500-SO3H) a permis l’obtention de conversions et de rendements en diesters élevés, avec une sélectivité en large faveur de l’isomère linéaire (rapport l/b=92/8). Une extension à été étudiée avec la synthèse d’un matériau hybride sulfoné (MCSi 10.4-SO3H) et a également conduit à une activité catalytique élevée avec une sélectivité importante en isomère linéaire (rapport l/b=92/8). Des tests avec des matériaux acides contrôles (résine commerciale sulfonée et silice sulfonée) ont été réalisés.

Complex based on palladium salt (II) were applied as catalysts for the hydroesterification of isosorbide, a biobased molecule, with 1-octen. First, the use of standard ionic liquids permits the immobilization of the catalyst (palladium + phosphine) and the conversion of 1-octen. The catalytic activity is dependent on the nature of the ionic liquid. The sulfonated ionic liquid bSmimAPTS permit the obtention of high conversions, with important yield in diester during three catalytic cycles, and avoid the use of paratoluenesulfonic acid. The catalyst (palladium + sulfonated phopshine) is immobilized in the ionic liquid phase. The regioselctivity of the reaction can be changed with the replacement of the TPPTS by a sulfonated bidentate phosphine (XANTPHOS, l/b ratio= 85/15 against 75/25 in classical condition). A system containing Pd(OAc)2/APTS/NBu4Br proved also highly effective in the conversion of 1-octen…

Advisors/Committee Members: Monflier, Eric (thesis director).

Subjects/Keywords: Hydroestérification; Isosorbide; Liquides ioniques sulfonés; Matériaux carbonés sulfonés; Matériaux hybrides sulfonés; Hydroesterification; Isosorbide; Sulfonated ionic liquids; Sulfonated carbonaceous materials; Sulfonated hybrid materials; 541.395

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Boulanger, J. (2014). Nouveaux systèmes catalytiques hétérogénéisés pour la synthèse d'esters d'isosorbide par hydroestérification : New heterogenized catalytic systems for the synthesis of isosorbide esters by hydroesterification. (Doctoral Dissertation). Université d'Artois. Retrieved from http://www.theses.fr/2014ARTO0402

Chicago Manual of Style (16th Edition):

Boulanger, Jérôme. “Nouveaux systèmes catalytiques hétérogénéisés pour la synthèse d'esters d'isosorbide par hydroestérification : New heterogenized catalytic systems for the synthesis of isosorbide esters by hydroesterification.” 2014. Doctoral Dissertation, Université d'Artois. Accessed November 12, 2019. http://www.theses.fr/2014ARTO0402.

MLA Handbook (7th Edition):

Boulanger, Jérôme. “Nouveaux systèmes catalytiques hétérogénéisés pour la synthèse d'esters d'isosorbide par hydroestérification : New heterogenized catalytic systems for the synthesis of isosorbide esters by hydroesterification.” 2014. Web. 12 Nov 2019.

Vancouver:

Boulanger J. Nouveaux systèmes catalytiques hétérogénéisés pour la synthèse d'esters d'isosorbide par hydroestérification : New heterogenized catalytic systems for the synthesis of isosorbide esters by hydroesterification. [Internet] [Doctoral dissertation]. Université d'Artois; 2014. [cited 2019 Nov 12]. Available from: http://www.theses.fr/2014ARTO0402.

Council of Science Editors:

Boulanger J. Nouveaux systèmes catalytiques hétérogénéisés pour la synthèse d'esters d'isosorbide par hydroestérification : New heterogenized catalytic systems for the synthesis of isosorbide esters by hydroesterification. [Doctoral Dissertation]. Université d'Artois; 2014. Available from: http://www.theses.fr/2014ARTO0402

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