Synthesis of polyetherimide/silica hybrid membranes by the sol–gel process: influence of the reaction conditions on the membrane properties

Romero, Analía I.; Parentis, Mónica Liliana; Habert, Alberto Cláudio; Gonzo, Elio Emilio

doi:10.1007/s10853-011-5380-4

Cited by 54 publications

(44 citation statements)

References 33 publications

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“…In the infrared spectra of PEI, there are absorption bands on stage and off stage associated with the vibration of the two carbonyl groups of imide functional group. The asymmetric and symmetric stretching vibrations of C=O groups were observed in the region of 1776 cm -1 and 1715 cm -1 [8] . Other absorption bands related to carbonyl, transverse and out of plane vibration of C-N in phthalimide rings, were present in the range of 1350-1360 cm -1 , 1070-1100 cm -1 and 737-745 cm -1 , as shown in Figure 1.…”

Section: Resultsmentioning

confidence: 98%

“…FTIR film spectra to PEI and SPEI are presented in Figure 1. This spectral range contains all characteristic bands of PEI [2][3][4][5]8 . In the infrared spectra of PEI, there are absorption bands on stage and off stage associated with the vibration of the two carbonyl groups of imide functional group.…”

Section: Resultsmentioning

confidence: 99%

“…Other absorption bands related to carbonyl, transverse and out of plane vibration of C-N in phthalimide rings, were present in the range of 1350-1360 cm -1 , 1070-1100 cm -1 and 737-745 cm -1 , as shown in Figure 1. Vibrations at 1268, 1233, 1072, and 1014 cm -1 are due to aryl ether bonds (C-O stretching of aromatic ether) 8 . In sulfonated samples, absorption bands due to asymmetric vibration (stretching O=S=O) can be observed at 1233 cm -1 .…”

Section: Resultsmentioning

confidence: 99%

“…Because of its excellent properties-price-processability balance 3 , it has gained importance in a wide variety of applications ranging from membranes 1,2,[4][5][6][7][8] , sensors 9,10 , and as a parent material for synthesis of composites 6,8,11 , ion exchange films (dialysis, electrodialysis, or full cells) 5,11,12 , polymer blends 2,6 , and modified polymers 1,[3][4][5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of sulfonated poly(ether imide) with higher thermal stability and effect on CO2, N2, and O2 permeabilities

et al. 2014

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An experimental design in different reaction conditions was applied to modify poly(ether imide), PEI, by sulfonation using acetyl sulfate. Higher temperatures and reaction times led to higher ion exchange capacity. The thermal analysis showed that our sulfonation approach accomplished preparing sulfonated PEI maintaining the thermal stability of its parent material even for the film with highest degree of sulfonation, and assessed the effect of this change on CO 2 , O 2 and N 2 permeabilities. The permeability results pointed out that our sulfonation approach is an effective way to produce high performance engineered polymers for fuel cell electrolyte membranes and for CO 2 separation from air. These results also suggest that the use of milder reactive medium at higher temperatures and for longer reaction times seems to be a more promising approach to achieve thermal stability than use more aggressive sulfonation agents.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of sulfonated poly(ether imide) with higher thermal stability and effect on CO2, N2, and O2 permeabilities

et al. 2014

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“…This solution was stirred at room temperature during 15 min. After that, 0.28 mL of 0.15M HCl aqueous solution diluted in 1 mL of ethanol were added dropwise (Romero et al, 2011;Zoppi et al, 2000) The resulting solution was kept under reflux and magnetic stirring. A white suspension of polysulfone-silica was obtained after 20 h of reaction.…”

Section: Preparation Of Polysulfone-silica Composite Membranesmentioning

confidence: 99%

Effect of Silica Source on the Synthesis and Properties of Polysulfone/Silica Composite Membranes for Gas Separation

Castruita¹

2018

Rev. Mex. Ing. Quim.

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This work reports the synthesis in-situ of silica particles inside a polysulfone matrix by the sol-gel method in acidic medium using different polymerization inorganic precursors: tetraethylorthosilicate (TEOS), 3-aminopropyltriethoxysilane (APTES) and mixture of them. The effect of the type of inorganic precursor on the formation of silica particles was studied. Composite membranes were prepared by casting technique from these organic-inorganic materials. These membranes were characterized by X-ray diffraction (XRD), infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The morphology, particle size and particle-polymer interaction were studied by scanning electron microscopy (SEM). Additionally, a semi-quantitative chemical analysis by energy dispersive X-ray spectroscopy (EDX) showed the chemical composition of the composite membranes. Type and concentration of silica precursor affected the morphology, particle size and distribution of silica in the composite membranes. Composite membranes without interfacial voids were obtained from APTES at 25 wt%. Initial studies about the gas separation properties of CO 2 /CH 4 gas mixture revealed an improvement on the CO 2 permeability of composite membrane comprising silica particles synthesized from APTES in comparison with the polymeric membrane. Keywords: silica, sol-gel, polysulfone, composite membrane, gas separation. ResumenEn este trabajo se reporta la síntesis in-situ de partículas de sílice dentro de una matriz de polisulfona mediante el método sol-gel en medio ácido usando diferentes precursores inorgánicos de polimerización: tetraetilortosilicato (TEOS), 3-aminopropiltrietoxisilano (APTES) y mezcla de ambos. Se estudió el efecto del tipo de precursor inorgánico en la formación de las partículas de sílice. Las membranas compuestas se prepararon por evaporación del disolvente a partir de los materiales orgánico-inorgánico. Estas membranas se caracterizaron por difracción de rayos X (XRD), espectroscopía de infrarrojo (FTIR), calorimetría diferencial de barrido (DSC) y análisis termogravimétrico (TGA). La morfología, tamaño de partícula y la interacción partícula-polímero se estudiaron por microscopia electrónica de barrido (SEM). Adicionalmente, el análisis químico semicuantitativo mediante espectroscopía de energía dispersiva de rayos X (EDX) mostró la composición química de las membranas compuestas. El tipo y la concentración del precursor de la sílice afectaron la morfología, el tamaño de partícula y la distribución de la sílice en las membranas compuestas. Las membranas compuestas que fueron obtenidas a partir de APTES al 25% no mostraron huecos interfaciales. Estudios iniciales de las propiedades de separación de una mezcla CO 2 /CH 4 revelaron el mejoramiento de la permeabilidad de CO 2 de las membranas compuestas que contienen partículas de sílice sintetizadas a partir de APTES en comparación con la membrana polimérica.

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Structure–property relationships of hyperbranched polyimide–silica hybrid membranes with different degrees of modification

Miki

Suzuki

Yamada

2013

J of Applied Polymer Sci

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The physical and gas transport properties of hyperbranched polyimide (HBPI)–silica hybrid membranes with different degrees of modification prepared with a dianhydride, 4,4′‐(hexafluoroisopropylidene) diphthalic anhydride, a triamine, 1,3,5‐tris(4‐aminophenoxy) benzene, and a coupling agent, 3‐aminopropyltrimethoxysilane, were investigated. With increasing degree of modification, the inherent viscosity of the hyperbranched poly(amic acid) increased, and the density of the HBPI decreased; this suggested the formation of crosslinking through the coupling agent. Dynamic mechanical analysis and thermomechanical analysis measurements indicated that the mobility of the HBPI molecular chains decreased in the rubbery region and that the free‐volume holes of the HBPI increased in the glassy region because of the increased degree of crosslinking through the coupling agent. The CO2 permeability and CO2/CH4 permselectivity of the HBPI–silica hybrid membranes increased with increasing silica content, with the latter increase being remarkable for the HBPI–silica hybrid membranes with a higher degree of modification. This suggested that the pronounced improvement in the CO2/CH4 permselectivity of the highly modified HBPI–silica hybrid membranes was likely caused by the contributions of both the intrinsic high‐fractional free volume attributed to crosslinking through the coupling agent and the characteristic distribution and interconnectivity of free‐volume holes created by hybridization with silica. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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Synthesis of polyetherimide/silica hybrid membranes by the sol–gel process: influence of the reaction conditions on the membrane properties

Cited by 54 publications

References 33 publications

Synthesis and characterization of sulfonated poly(ether imide) with higher thermal stability and effect on CO2, N2, and O2 permeabilities

Synthesis and characterization of sulfonated poly(ether imide) with higher thermal stability and effect on CO2, N2, and O2 permeabilities

Effect of Silica Source on the Synthesis and Properties of Polysulfone/Silica Composite Membranes for Gas Separation

Structure–property relationships of hyperbranched polyimide–silica hybrid membranes with different degrees of modification

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