Evaluating the gas permeation properties and hydrothermal stability of organosilica membranes under different hydrosilylation conditions

Kanezashi, Masakoto; Sazaki, Hitomi; Nagasawa, Hiroki; Yoshioka, Tomohisa; Tsuru, Toshinori

doi:10.1016/j.memsci.2015.06.059

Cited by 8 publications

(5 citation statements)

References 34 publications

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“…Peaks at 1600 and 1410 cm –1 assigned to Si–CC stretching vibration bonds (v Si–CC) were decreased in the film prepared with a Pt catalyst. Thus, we concluded that the hydrosilylation of Si–H groups and Si–CC groups in eq had proceeded with the addition of a Pt catalyst to the SQ sol at a low temperature (40 °C or less) Since the Si–CC groups in VTMS and the TRIES-derived Si–H groups in TRIES–VTMS hybrid polymers are located separately via the formation of Si–O–Si bonds caused by the hydrolysis and condensation of Si–OCH 3 and Si–OC 2 H 5 groups, the reactivity of intermolecular hydrosilylation between the Si–CC groups in VTMS and the TRIES-derived Si–H groups might be low.…”

Section: Resultssupporting

confidence: 78%

“…Thus, we concluded that the hydrosilylation of Si–H groups and Si–C=C groups in eq 1 had proceeded with the addition of a Pt catalyst to the SQ sol at a low temperature (40 °C or less). 35 Since the Si–C=C groups in VTMS and the TRIES-derived Si–H groups in TRIES–VTMS hybrid polymers are located separately via the formation of Si–O–Si bonds caused by the hydrolysis and condensation of Si–OCH 3 and Si–OC 2 H 5 groups, the reactivity of intermolecular hydrosilylation between the Si–C=C groups in VTMS and the TRIES-derived Si–H groups might be low. TMDSO can only be introduced in the SQ structure via hydrosilylation, which means that the Si–H groups in TMDSO could preferentially react with the Si–C=C groups in VTMS.…”

Section: Resultsmentioning

confidence: 99%

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Tailoring a Thermally Stable Amorphous SiOC Structure for the Separation of Large Molecules: The Effect of Calcination Temperature on SiOC Structures and Gas Permeation Properties

et al. 2018

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A SiOC membrane with high oxidative stability for gas separation was tailored by utilizing vinyltrimethoxysilane, triethoxysilane, and 1,1,3,3-tetramethyldisiloxane as Si precursors. Amorphous SiOC networks were formed via the condensation of Si–OH groups, the hydrosilylation of Si–H and Si–CH=CH 2 groups, and a crosslinking reaction of Si–CH 3 groups, respectively. The crosslinking of Si–CH 3 groups at temperatures ranging from 600 to 700 °C under a N 2 atmosphere was quite effective in constructing a Si–CH 2 –Si unit without the formation of mesopores, which was confirmed by the results of N 2 adsorption and by the gas permeation properties. The network pore size of the SiOC membrane calcined at 700 °C under N 2 showed high oxidative stability at 500 °C and was appropriate for the separation of large molecules (H 2 /CF 4 selectivity: 640, H 2 /SF 6 : 2900, N 2 /CF 4 : 98). A SiOC membrane calcined at 800 °C showed H 2 /N 2 selectivity of 62, which was approximately 10 times higher than that calcined at 700 °C because the SiOC networks were densified by the cleavage and redistribution reactions of Si–C and Si–O groups.

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Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Tailoring a Thermally Stable Amorphous SiOC Structure for the Separation of Large Molecules: The Effect of Calcination Temperature on SiOC Structures and Gas Permeation Properties

et al. 2018

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“…This could be attributed to the gradual generation of Si-OH groups on the surface of the membrane pores, which increase the affinity and permeability to small-sized H 2 O molecules (0.296 nm). However, the permeation of large-sized N 2 molecules (0.36 nm) through the pores was inhibited by Si-OH groups and/or adsorbed H 2 O [115,116]. After drying the membrane at 500 • C for 3 h, the N 2 permeance was almost recovered, and the single-gas permeation performance of the membrane was similar to that of a fresh membrane.…”

Section: Hydrothermal Stabilitymentioning

confidence: 90%

Recent Progress in Silicon Carbide-Based Membranes for Gas Separation

2022

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The scale of research for developing and applying silicon carbide (SiC) membranes for gas separation has rapidly expanded over the last few decades. Given its importance, this review summarizes the progress on SiC membranes for gas separation by focusing on SiC membrane preparation approaches and their application. The precursor-derived ceramic approaches for preparing SiC membranes include chemical vapor deposition (CVD)/chemical vapor infiltration (CVI) deposition and pyrolysis of polymeric precursor. Generally, SiC membranes formed using the CVD/CVI deposition route have dense structures, making such membranes suitable for small-molecule gas separation. On the contrary, pyrolysis of a polymeric precursor is the most common and promising route for preparing SiC membranes, which includes the steps of precursor selection, coating/shaping, curing for cross-linking, and pyrolysis. Among these steps, the precursor, curing method, and pyrolysis temperature significantly impact the final microstructures and separation performance of membranes. Based on our discussion of these influencing factors, there is now a good understanding of the evolution of membrane microstructures and how to control membrane microstructures according to the application purpose. In addition, the thermal stability, oxidation resistance, hydrothermal stability, and chemical resistance of the SiC membranes are described. Due to their robust advantages and high separation performance, SiC membranes are the most promising candidates for high-temperature gas separation. Overall, this review will provide meaningful insight and guidance for developing SiC membranes and achieving excellent gas separation performance.

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“…Particularly, the platinum divinyltetramethyl‐disiloxane (M Vi M Vi ) complex (Karstedt's catalyst, 15 ) has been established as the benchmark for other hydrosilylation catalysts and became one of the most important catalysts in industry . So far, these two catalysts still play an important role in the construction of organosilicon networks, such as cross‐linked polysiloxanes, organosilica membranes, silicone rubber, silicone resins, highly porous polyhedral silsesquioxane polymers, fluorosiloxane hybrid materials, etc.…”

Section: Curing Systems (Cross‐linking Reactions)mentioning

confidence: 99%

Catalytic Systems for the Cross‐Linking of Organosilicon Polymers

Wang

Klein

Mejía

2017

Chemistry An Asian Journal

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Silicones and silicone rubbers are omnipresent in household and industrial products such as lubricants,c oatings, sealants,i nsulators, medicald evices, etc. This plethora of applicationsa rises from their unparalleled properties including hydrophobicity,l ow surfacee nergy,c hemical inertness, extreme temperature stability,e lasticity,a nd biocompatibility.E vent hough silicones have been known for more than five decades, their chemistry is still far from fully understood. Industrially,t he vast majority of processesf or their synthesis, transformation, andu se are based on rather well established, alas outdated technologies, which are frequently empirical and poorly investigated. Thisr eview attempts to summarize the different approaches for the synthesis of silicone rubbers by vulcanizationorc uring of silicone polymers, the catalysts used, and the corresponding reaction mechanisms. Apart from the well-known methods (radical, hydrosilylation, and metal-based condensation), novel approaches such as organo-and bio-catalysis are also addressed.

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Evaluating the gas permeation properties and hydrothermal stability of organosilica membranes under different hydrosilylation conditions

Cited by 8 publications

References 34 publications

Tailoring a Thermally Stable Amorphous SiOC Structure for the Separation of Large Molecules: The Effect of Calcination Temperature on SiOC Structures and Gas Permeation Properties

Tailoring a Thermally Stable Amorphous SiOC Structure for the Separation of Large Molecules: The Effect of Calcination Temperature on SiOC Structures and Gas Permeation Properties

Recent Progress in Silicon Carbide-Based Membranes for Gas Separation

Catalytic Systems for the Cross‐Linking of Organosilicon Polymers

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