Gas transport properties of segmented poly(ether siloxane urethane urea) membranes

Gomes, Dominique; Peinemann, Klaus‐Viktor; Nunes, Suzana Pereira; Kujawski, Wojciech; Kozakiewicz, Janusz

doi:10.1016/j.memsci.2006.05.002

Cited by 46 publications

(32 citation statements)

References 28 publications

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“…Because of those unique characteristics, silicone-urethanes, specifically moisturecured, have been tested widely as specialty coatings, elastomers for medical applications, or semi-permeation membranes. [1][2][3][4][5][6] The idea of combining high mechanical strength of polyurethanes with high flexibility of chains represented by silicones appeared to be attractive also for researchers working on novel polymeric systems applied as semi-permeable separating matrices in lithium batteries. Solid polymer separators designed for lithium batteries are usually based on copolymers containing polyethylene oxide (PEO) segments because it is well known that conductivity in such systems is facilitated by complexation of lithium ions (Li + ) by oxyethylene units.…”

Section: Introductionmentioning

confidence: 99%

Silicone-urethane membranes for lithium batteries. Part 1. Moisture-cured poly(siloxane-urethane-urea) elastomers containing polyethylene oxide (PEO) segments - synthesis and characterization as potential membrane materials

Kozakiewicz

Przybylski

Sylwestrzak

2015

Polym. Adv. Technol.

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Poly(siloxane-urethane-urea) elastomers containing both polysiloxane and polyethylene oxide (PEO) segments in the polymer chain were obtained by moisture-curing of NCO-terminated poly(siloxane-urethane) prepolymers synthesized from isophorone diisocyanate and mixtures of polyoxyethylene diols and polysiloxane diols with various molecular weights. Mechanical properties of the moisture-cured films and their swelling ability in solvent mixtures commonly used in lithium batteries were investigated, and it was found that they were greatly influenced by PEO content in the polymer. PEO content in the polymer was also found to affect very much the electric conductivity of the films after immersion in lithium salt solution in ethylene carbonate-dimethyl carbonate solvent mixture. At high contents of PEO in the polymer chain specific conductivities of the films in a range of 10 À3 , Scm À1 could be achieved at room temperature. Based on the results of Scanning Electron Microscopy with X-ray Analysis (SEM/EDS) investigations and wide-angle X-ray scattering and small-angle X-ray scattering studies, it could be anticipated that the reason for good conductivity of the films might be their specific supramolecular structure that potentially facilitated lithium ion mobility.

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Section: Introductionmentioning

confidence: 99%

Silicone-urethane membranes for lithium batteries. Part 1. Moisture-cured poly(siloxane-urethane-urea) elastomers containing polyethylene oxide (PEO) segments - synthesis and characterization as potential membrane materials

Kozakiewicz

Przybylski

Sylwestrzak

2015

Polym. Adv. Technol.

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“…Membranas poliméricas densas têm sido extensivamente estudadas para o emprego em separação de gases, incluindo: o enriquecimento de nitrogênio e de oxigênio; a recuperação de hidrogênio; a remoção de gases ácidos (CO 2 , H 2 S) do gás natural e de voláteis orgânicos; a desidratação de ar e do gás natural, além de outras aplicações, nas áreas química, têxtil, biomédica, petroquímica, farmacêutica e alimentícia [11][12][13][14][15][16][17][18][19][20] . Os poliuretanos (PU) são materiais que têm sido investigados na utilização em membranas densas permeáveis a gases devido à possibilidade de adequação de suas propriedades de transporte através da variação da microestrutura do polímero [15,[21][22][23][24][25][26] . Fatores como o tipo de monômeros, a massa molar do poliol, o extensor de cadeia (aminados ou hidroxilados) e o método de síntese, podem ser planejados para controlar a estrutura e a morfologia dos poliuretanos resultantes.…”

Section: -Avaliação Das Propriedades De Barreira De Membranas Obtidasunclassified

Avaliação das Propriedades de Barreira de Membranas Obtidas a partir de Dispersões Aquosas à Base de Poliuretanos e Argila

Barboza¹,

Delpech²,

Garcia³

et al. 2014

Polímeros

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Resumo: Formulações de aplicação não-poluente à base de poliuretanos em dispersão aquosa (WPUs), com adição de argila montmorilonita hidrofílica (CWPUs), foram sintetizadas. A permeabilidade ao dióxido de carbono (CO 2 ) de membranas densas obtidas a partir do espalhamento das dispersões foi avaliada. Os reagentes empregados na síntese dos materiais foram: poli(glicol proplilênico) (PPG), copolímero em bloco à base de segmentos de poli(glicol etilênico) e poli(glicol propilênico) (EG-b-PG), ácido dimetilolpropiônico (DMPA), diisocianato de isoforona (IPDI) e etilenodiamina (EDA), como extensor de cadeia, levando à formação de ligações de ureia. Diferentes formulações foram obtidas variando-se a proporção de segmentos à base de poli(glicol etilênico) (PEG) e o teor de argila (0,5 e 1 %). As dispersões foram avaliadas em termos de teor de sólidos e viscosidade aparente. As membranas foram caracterizadas por espectrometria na região do infravermelho (FTIR) e permeabilidade ao dióxido de carbono (CO 2 ). A influência nas propriedades de barreira, conferida pela presença da argila e do copolímero em bloco, foi verificada por ensaios de permeabilidade. A permeabilidade ao CO 2 aumentou com o aumento no teor segmentos de PEG e diminuiu com a inserção da argila, uma vez que esta é impermeável a gases, formando caminhos preferenciais na matriz polimérica que retardam a difusão das moléculas de gás. Palavras-chave: Poliuretanos, dispersões aquosas, argila, montmorilonita, membranas, permeabilidade a gases, propriedades de barreira. Evaluation of Carbon Dioxide Gas Barrier Properties of Membranes Obtained from Aqueous Dispersions Based on Polyurethane and ClayAbstract: Non-polluting aqueous polyurethane-based dispersions were synthesized in the presence and absence of montmorillonite hydrophilic clay (WPUs and CWPUs, respectively). The permeability of carbon dioxide (CO 2 ) through dense membranes obtained from the dispersions was evaluated. The reagents used in the synthesis of the materials were: poly(propylene glycol) (PPG), block copolymer of poly(ethylene glycol) and poly(propylene glycol) (EG-b-PG), dimethylolpropionic acid (DMPA), isophorone diisocyanate (IPDI) and ethylene diamine (EDA) as chain extender, leading to the formation of urea linkages. The proportion of poly(ethylene glycol) (PEG) segments and clay content (0.5 and 1%) was varied in the formulations. The dispersions were evaluated in terms of solids content and apparent viscosity. The membranes were characterized by infrared spectrometry (FTIR) and permeability to carbon dioxide (CO 2 ). The influence on the gas barrier properties, imparted by different contents of PEG segments in polyurethane chains, and by the clay in the formulations was verified. The permeability of CO 2 increased with increasing amounts of PEG segments and decreased with the insertion of clay, since the latter is impermeable to gas and forms, in the polymeric matrix, tortuous pathways that retard gas diffusion.

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“…Two PUD samples were synthesized using a pre-polymer process [18]. The procedure was summarized in Scheme 1.…”

Section: Puds Synthesismentioning

confidence: 99%

“…As a result, the dispersed PDMS phases served to produce a more tortuous route for diffusing molecules. Recently Gomes et al [18] reported the correlation of gas permselectivities with the contents of PDMS/poly(tetramethylene glycol) soft segments for the thin film membranes made from polyurethane dispersions (PUDs). It is interesting to note that n-C 4 H 10 /CH 4 selectivity for the gas mixture was higher than the ratio of individual gas permeabilities, indicating a possibility of application of this PUD material for n-C 4 H 10 /CH 4 separation.…”

Section: Introductionmentioning

confidence: 99%

Polyurethane–poly(vinylidene fluoride) (PU–PVDF) thin film composite membranes for gas separation

Jiang

Ding

Kumar

2008

Journal of Membrane Science

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Aqueous polyurethane dispersions (PUDs) with poly(dimethylsiloxane) (PDMS), or mixed poly (dimethylsiloxane)/poly(ethylene glycol) (PDMS/PEG) as the soft segment were synthesized, and made into thin films for characterization with differential scanning calorimetry (DSC), thermogarvimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), size exclusion chromatography (SEC) and transmission electron microscopy (TEM). Seven thin film composite (TFC) membranes prepared on PUDs and PVDF substrates were evaluated by the separation of air as well as hydrocarbon-nitrogen mixtures. A promising membrane was then selected for further investigation of the morphological structure and permselectivities, using pure gases and binary mixtures of ethylene, ethane, propylene and propane with nitrogen at ambient temperature. It was found that PDMS/PEG-based PU membrane was typically solubility-selective for condensable hydrocarbons, and nitrogen permeance was marginally enhanced in hydrocarbon-nitrogen mixtures. It appears that the copolymer membrane with both urethane and PEG segments can effectively tolerate the swelling caused by the condensable gases. As a result, the selectivities of propylene and propane to nitrogen were substantially improved, e.g., in a mixture containing 28% propylene and 72% nitrogen, the selectivity of propylene to nitrogen reached 29.2 with a propylene permeance of 34.4 gas permeation unit (GPU).Crown

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Gas transport properties of segmented poly(ether siloxane urethane urea) membranes

Cited by 46 publications

References 28 publications

Silicone-urethane membranes for lithium batteries. Part 1. Moisture-cured poly(siloxane-urethane-urea) elastomers containing polyethylene oxide (PEO) segments - synthesis and characterization as potential membrane materials

Silicone-urethane membranes for lithium batteries. Part 1. Moisture-cured poly(siloxane-urethane-urea) elastomers containing polyethylene oxide (PEO) segments - synthesis and characterization as potential membrane materials

Avaliação das Propriedades de Barreira de Membranas Obtidas a partir de Dispersões Aquosas à Base de Poliuretanos e Argila

Polyurethane–poly(vinylidene fluoride) (PU–PVDF) thin film composite membranes for gas separation

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