Pushing the limits on possibilities for large scale gas separation: which strategies?

Koros, William J.; Mahajan, Rajiv

doi:10.1016/s0376-7388(00)00418-x

Cited by 781 publications

(461 citation statements)

References 38 publications

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“…17 Mechanical stability and aging properties are core considerations for industrial applications, integral to both product and process design. 5,12,[18][19][20] Glassy polymer membranes offer exciting separation performance, but are hindered by their mechanical properties and physical aging. 21,22 High additive loading generally causes severe embrittlement, though a few recent studies have reported stable MMM films through targeted polymer-additive interactions.…”

Section: Introductionmentioning

confidence: 99%

Physical aging in glassy mixed matrix membranes; tuning particle interaction for mechanically robust nanocomposite films

et al. 2016

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Despite the exceptional separation performance of modern glassy mixed matrix membranes, these materials are not being utilized to improve the performance of existing membrane technologies. Nano-sized additives can greatly enhance separation performance, and have recently been used to overcome age-related performance loss of high performance MMMs. However nano-additives also compromise the structural integrity of films and little is known on how physical aging affects their mechanical properties over time. A solution for both physical aging and mechanical instability is required before these high performance materials can be utilised in industrial membrane applications. Here, we examine physical aging in mixed matrix membranes through mechanical properties and single gas permeation measurements using three glassy polymers, Matrimid® 5218, poly-1-trimethylsilyl-1-propyne (PTMSP), and a Polymer of Intrinsic Microporosity (PIM-1); and a range of nano-scale additives; Silica, PAF-1, UiO-66, and Ti5UiO-66, each previously shown to enhance gas separation performance. We find polymer-additive interactions strongly influence local physical aging and play a key role in determining the overall material properties of glassy nanocomposite films. Strong interface interactions can slow physical aging, and may not correlate to reinforced or age-stable films. Whereas traditionally 'incompatible' nanocomposites exhibit mechanical properties that can improve over time and even outperform their native polymers.Tuning polymer-additive interactions is vital to achieving the physical aging, mechanical stability, and permselectivity requirements of advanced mixed matrix membrane technologies and reducing the enormous global energy cost of separation processes.

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Section: Introductionmentioning

confidence: 99%

Physical aging in glassy mixed matrix membranes; tuning particle interaction for mechanically robust nanocomposite films

et al. 2016

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“…5,6 Currently, there is much interest in the design of novel polymers exhibiting microporosity, which are potential membrane materials with gas transport properties at or above the upper bound relationships. 4,7,8 In general, higher membrane gas permeability can be obtained by significantly increasing free volume by the introduction of intrinsic microporosity and enhancing the rigidity of polymer chains. 9−12 The rigid and contorted macromolecular chain architecture of polymers of intrinsic microporosity (PIMs), 9,13−25 (e.g., the notable PIM-1 14 is the archetype of this class of materials) provides a desirable combination of poor chain packing and high chain rigidity, giving excellent gas permeability and moderate selectivity, with some PIMs exceeding the Robeson's upper bound for some commercially important gas pairs.…”

Section: ■ Introductionmentioning

confidence: 99%

Intrinsically Microporous Soluble Polyimides Incorporating Tröger’s Base for Membrane Gas Separation

et al. 2014

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“…Pequenas quantidades de micro-ou nanocarga, são suficientes para agregar ao polímero uma melhora expressiva em suas propriedades, reduzindo o custo e o peso dos artigos acabados em comparação aos compósitos convencionais [10] . 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] .…”

Section: -Avaliação Das Propriedades De Barreira De Membranas Obtidasunclassified

“…As propriedades de transporte também são influenciadas pela natureza química de polióis e extensores de cadeia. Dentre outros fatores que influenciam a permeabilidade das membranas podem ser citados a morfologia, a densidade, o grau de cristalinidade e a temperatura de transição vítrea (T g ) do segmento flexível [20] . Com o aumento do teor de copolímero EG-b-PG, ou seja, de segmentos à base de poli (glicol etilênico), houve um aumento na permeabilidade das membranas.…”

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

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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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Pushing the limits on possibilities for large scale gas separation: which strategies?

Cited by 781 publications

References 38 publications

Physical aging in glassy mixed matrix membranes; tuning particle interaction for mechanically robust nanocomposite films

Physical aging in glassy mixed matrix membranes; tuning particle interaction for mechanically robust nanocomposite films

Intrinsically Microporous Soluble Polyimides Incorporating Tröger’s Base for Membrane Gas Separation

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

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