Synthesis and gas transport properties of crosslinked poly(dimethylsiloxane) nanocomposite membranes using octatrimethylsiloxy POSS nanoparticles

Rezakazemi, Mashallah; Vatani, Ali; Mohammadi, Toraj

doi:10.1016/j.jngse.2016.01.033

Cited by 72 publications

(32 citation statements)

References 39 publications

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“…Synergistic interactions between the nanoparticles and membrane were created, and these were related to the presence of POSS and FS in the membrane . There were different absorption peaks when POSS was added to PMP; these included peaks for SiOSi stretching at 1000 and 1100 cm −1 , symmetric deformation of CH in SiCH 3 at 1260 cm −1 , and CH 3 rocking and SiC stretching in SiCH 3 at 790 cm −1 . Also, an SiOSi absorption peak at 1060 cm −1 and a SiCH 3 stretching peak at 790 cm −1 were displayed; these were related to the presence of FS in the membrane.…”

Section: Resultssupporting

confidence: 70%

“…Although all of the permeabilities were reduced with increasing POSS content, some selectivities were enhanced. We expected that POSS nanoparticles would occupy the free volume inside the polymer and lead to a reduction of FFV and, consequently, the permeability . So, despite the mechanism of FS impact on the vapor/permanent‐gas selectivity, the incorporation of POSS led to an increase in the propane/methane and propane/nitrogen selectivities.…”

Section: Resultssupporting

confidence: 65%

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Application of polyhedral oligomeric silsesquioxane to the stabilization and performance enhancement of poly(4‐methyl‐2‐pentyne) nanocomposite membranes for natural gas conditioning

Khosravi

Vatani

Mohammadi

2017

J of Applied Polymer Sci

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The application of octatrimethylsiloxy polyhedral oligomeric silsesquioxane (POSS) nanoparticles was investigated in the fabrication of novel reverse‐selective poly(4‐methyl‐2‐pentyne) (PMP) nanocomposite membranes for the separation of heavier hydrocarbons from methane. Generally, PMP and PMP–fumed silica (FS) nanocomposite membranes suffer severe physical aging with approximately 40% permeation flux reduction over 120 days. A straightforward strategy was introduced to suppress the physical aging of PMP and also to improve the thermal stability without compromising the selectivities and permeabilities through the incorporation of a functionalized POSS–FS binary filler system. Fourier transform infrared spectroscopy and scanning electron microscopy proved productive interactions between the fillers and polymer, with a fair compatibility between them. Thermogravimetric analysis confirmed that the thermal stability of the neat PMP was enhanced by the incorporation of the fillers into the nanocomposites. The addition of POSS and FS led to improved operational performance, such as in the permeability and selectivity, over the neat PMP. The permeation stabilities of the PMP–POSS and PMP–FS–POSS nanocomposite membranes were clearly improved over a long time (120 days). The permeation data indicated that the PMP–3 wt % POSS–20 wt % FS nanocomposite membrane is promising for C3H8/N2 and C3H8/CH4 separation. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45158.

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Section: Resultssupporting

confidence: 70%

Section: Resultssupporting

confidence: 65%

Application of polyhedral oligomeric silsesquioxane to the stabilization and performance enhancement of poly(4‐methyl‐2‐pentyne) nanocomposite membranes for natural gas conditioning

Khosravi

Vatani

Mohammadi

2017

J of Applied Polymer Sci

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“…Among various kinds of inorganic compounds, silanes are more capable materials for easy functionalization with organic compounds, and they possess numerous benefits such as high hydrophilicity, higher thermal stability, and low cost . On the basis of these functionalities, specifically surface modification, silane can effectively interact with polymers and can produce homogenous dispersion in the polymer matrix . Typically, silane functionalization could be classified as chlorosilanes, alkoxy silanes, acetoxysilanes, hydrosilanes, and carbofunctional silanes .…”

Section: Introductionmentioning

confidence: 99%

Development of perfluorosulfonic acid polymer‐based hybrid composite membrane with alkoxysilane functionalized polymer for vanadium redox flow battery

et al. 2019

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Summary A new kind of alkoxy silane functionalized polymer (ASFP) is synthesized by selectively functionalized carboxyl groups as a novel inorganic precursor polymer to prepare organic‐inorganic hybrid membrane for vanadium redox flow battery (VRFB) system. The novel hybrid membrane has been fabricated by interconnection between hydrophilic domains of Nafion and ASFP functional group. The effective concentration of ASFP for hybrid membrane is 25% (wt/wt). The proton conductivity and selectivity of the hybrid membrane are comparable with those of the Nafion212 membrane, which is mainly attributed by the presence of additional hydrophilic domains in the hybrid membrane. The proton conductivity and ion exchange capacity of the Nafion‐ASFP (75:25) membrane is 0.061 S/cm and 0.68 meq/g, respectively. Remarkably, the Nafion‐ASFP membrane shows a low vanadium permeability (1.259 × 10−7 cm2/min) and high selectivity, which is an excellent advantage. As a result, the hybrid membrane shows comparable efficiency performance with Nafion212 over 50 cycles. Notably, the VRFB unit cell with Nafion‐ASFP membrane achieves higher coulombic efficiency than Nafion212. The hybrid membrane reveals a new route to develop an alternative fluorinated polymer membrane with numerous advantages especially cost‐effectiveness, homogeneous dispersion of inorganic silica precursor materials in the hybrid membrane without deterioration of mechanical strength, and lower vanadium ion crossover for VRFB system.

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“…Moreover, the membranes offer lower operational and maintenance costs. So far, membranes have been used for various applications in gas and liquid separation such as gas purification, hydrogen purification,[11,] natural gas sweetening, water desalination, pervaporation, and bioseparation . Application of membranes for the specific process depends on the type of media, process conditions, and costs .…”

Section: Introductionmentioning

confidence: 99%

Simulation of Nonporous Polymeric Membranes Using CFD for Bioethanol Purification

Asadollahzadeh

Raoufi

Rezakazemi

et al. 2018

Macro Theory & Simulations

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A mechanistic model is developed to simulate ethanol purification using membrane technology. In the considered process, a feed solution containing 10 wt% water + 90 wt% ethanol is contacted with a polymeric dense membrane in a pervaporation system. The membrane selectively separates water from solution in order to purify the ethanol. In the development of the model, it is assumed that the water is the main penetrant through the membrane due to the hydrophilicity of membrane material. The mass fraction of water molecules in the feed solution, as well as membrane, is estimated using Maxwell–Stefan approach. The governing equations are then solved using finite element method in order to predict mass fraction, mass transfer flux, and velocity of the solution in the membrane module. The results indicate that the model can predict the formation of concentration and velocity boundary layer in the feed solution near the membrane/feed interface. Moreover, the developed model is robust and reliable in the understanding of membrane separation processes applicable for dehydration of alcohols.

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Synthesis and gas transport properties of crosslinked poly(dimethylsiloxane) nanocomposite membranes using octatrimethylsiloxy POSS nanoparticles

Cited by 72 publications

References 39 publications

Application of polyhedral oligomeric silsesquioxane to the stabilization and performance enhancement of poly(4‐methyl‐2‐pentyne) nanocomposite membranes for natural gas conditioning

Application of polyhedral oligomeric silsesquioxane to the stabilization and performance enhancement of poly(4‐methyl‐2‐pentyne) nanocomposite membranes for natural gas conditioning

Development of perfluorosulfonic acid polymer‐based hybrid composite membrane with alkoxysilane functionalized polymer for vanadium redox flow battery

Simulation of Nonporous Polymeric Membranes Using CFD for Bioethanol Purification

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