Effect of Polyvinyl Alcohol Modified Silica Particles on the Physical and Gas Separation Properties of the Polyurethane Mixed Matrix Membranes

Ghalei, Behnam; Isfahani, Ali Pournaghshband; Nilouyal, Somaye; Vakili, Eshagh; Salooki, Mahdi Koolivand

doi:10.1007/s12633-018-9959-0

Cited by 15 publications

(10 citation statements)

References 55 publications

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“…Polyurethanes (PUs) are a well-known class of rubbery polymer structures [4]. Recent research shows that PU membranes are good candidates for gas separation membranes because of their high mechanical properties, thermal stability as well as high gas separation performance.…”

Section: Introductionmentioning

confidence: 99%

“…The chemical modi cation of polymer structures and embedding of inorganic particles into polymer matrix such as porous metal-organic frameworks (MOFs), Polyhedral oligomeric silsesquioxane (POSS), zeolites, carbon molecular sieves, alumina, and nonporous silica into polymer have been proposed by different researchers as an e cient technique to improve gas separation properties of different polymeric membranes [4,[10][11][12]. The act of adding inorganic particles to membranes is essentially an attempt to synergize the effect of both components by the combination of the advantages of each phase: high selectivity and desirable mechanical properties of the dispersed particles as well as economic advantages and ease of processing of polymers [13].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Gas Separation Properties of Polyurethane Membranes in Presence of Boehmite Nanoparticles

Tourani

Akbarbandari

2022

J Inorg Organomet Polym

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In this study, the effect of boehmite nanoparticles on the CO 2 , CH 4 , O 2 , and N 2 permeability in polyurethane membranes was investigated. Boehmite nanoparticles were synthesized by the hydrothermal method using the salt of aluminum nitrate Al (NO 3 ) 3 and diethanolamine as a precipitating agent. Different temperatures (110, 160, and 200) ° C and times (18-24 h) in synthesizing boehmite nanoparticles are also investigated. The characteristics of the synthesized nanoparticles were analyzed with X-ray diffraction (XRD), Field-emission scanning electron microscopy (FESEM), and Transmission electron microscopy (TEM). The analysis results represented that increasing the temperature to 200°C as well as high duration time at this temperature (24 hours) results in nanoparticles with high purity and high crystallinity. Polyurethane was synthesized by bulk two-step polymerization using hexamethylene diisocyanate (HMDI) and 1,4-butanediol (BDO) as hard segments and poly(tetramethylene glycol) (PTMG, 2,000 g/mol) as the soft segment. The synthesized polymer was in a molar ratio: PTMG: HMDI: BDO = 1:3:2. PU membranes and PU-boehmite nanocomposite membranes were prepared using solution casting and solvent evaporation technique. The characteristics of the synthesized nanocomposite membranes were analyzed with Fourier transform infrared (FTIR) spectroscopy, Field-emission scanning electron microscopy (FESEM), and differential scanning calorimetry (DSC). The results of characterization analyses indicated that strong interaction between boehmite nanoparticles and polymer and also the appropriate distribution of boehmite nanoparticles in the prepared samples. Gas permeation properties of polyurethane -boehmite nanocomposite at different boehmite loadings (0, 5, 10, 15, and 20 wt %) were studied for pure CO 2 , CH 4 , O 2 , and N 2 gases at 10 bar and 30 • C. The obtained results indicated the reduction in permeability of all gases, but enhancement in CO 2 /N 2 , CO 2 /CH 4 , and O 2 /N 2 selectivities were observed as boehmite content increases. In the membrane with 20 wt.% boehmite content, enhancement of CO 2 /N 2 (39.53%) and CO 2 /CH 4 (35.64%) selectivities were observed in comparison with pure polyurethane, while the CO 2 permeability reduction of polyurethane-boehmite membranes was 22.08%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of the Gas Separation Properties of Polyurethane Membranes in Presence of Boehmite Nanoparticles

Tourani

Akbarbandari

2022

J Inorg Organomet Polym

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“…The researches of nanoparticles have focused on the dispersion stability in emulsions and nanofluids, 25,26 polymer nanocomposite (PNC) films, 27−29 membrane, 30,31 enhancement of the polymer adhesion performance. 32,33 The low cohesive energy density of these fluorinated and silicone-based polymers allows for the increased compatibility with CO 2 and a high degree of steric stabilization.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Subsequently, the steric stabilization of silica colloids in CO 2 was barely reported. The researches of nanoparticles have focused on the dispersion stability in emulsions and nanofluids, , polymer nanocomposite (PNC) films, − membrane, , enhancement of the polymer adhesion performance. , The low cohesive energy density of these fluorinated and silicone-based polymers allows for the increased compatibility with CO 2 and a high degree of steric stabilization. However, both fluorinated and silicone-based polymers are expensive, and fluorinated additives can cause environmental issues.…”

Section: Introductionmentioning

confidence: 99%

Dispersibility of Poly(vinyl acetate) Modified Silica Nanoparticles in Carbon Dioxide with Several Cosolvents

et al. 2021

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The dispersibility and stabilization of silica nanoparticles with surface-capped poly(vinyl acetate) (PVAc) chains are examined in carbon dioxide with four different cosolvents. Three surface coverages of silica-PVAc were formed by using different weight ratios of the silica and PVAc. The dispersibilities of three silica-PVAc nanoparticles in CO2 with the four cosolvents were tested in a rotatable high-pressure variable-volume view cell. The effects of surface coverage, cosolvent type, pressure, and particle concentration on dispersion were investigated. Results show that, in the experimental pressure range (5.5 to 20 MPa), the pressure has no significant effect on the dispersion of nanoparticles, and the cosolvent is the key factor in dispersing silica-PVAc particles in CO2. 1-Butanol is an adequate cosolvent to disperse silica-PVAc in CO2 with any coverage of PVAc on the surface of the particles when the concentration of particles is smaller than 0.31 wt %. Ethanol can only improve the dispersibility of particles with a high surface coverage of PVAc when the concentration of particles is smaller than 0.14 wt %. 1-Hexanol and ethyl acetate cannot disperse the particles in CO2 with any coverage of PVAc. Molecular dynamics simulations were carried out to study the nanoparticle-CO2-cosolvent dispersions. Results suggest that 1-butanol has a good solubility in the CO2 condensed phase and can effectively absorb onto the nanoparticle surface, which help to prevent the formation of nanoparticle aggregation. The precipitation of nanoparticles in the nanoparticle/1-hexanol/CO2 and nanoparticle/ethyl acetate/CO2 systems is attributed to the relatively low solubility of CO2 in 1-hexanol and ethyl acetate. The precipitation of nanoparticles in the nanoparticle/ethanol/CO2 system is the result of less hindrance of ethanol molecules to the aggregation of nanoparticles.

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“…Therefore, two silane coupling agents (γ‐(2,3‐epoxypropoxy)propytrimethoxysilane (KH560) and (heptadecafluoro‐1,1,2,2‐tetradecyl)trimethoxysilane (FAS)) are used to modify PU coatings. The hydrolysis reaction between silanol groups can be realized by using SiO 2 hydroxyl groups and silane coupling agents . Next, the C–F and Si–O modified materials with low surface energy are introduced into the PU main chain by in situ polymerization by the molecular structure design, and the appropriate ratio of the two components of –NCO and –OH is adjusted to obtain a PU hydrophobic coating with excellent performance.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of fluorinated silicon two‐component polyurethane hydrophobic coatings

Tian

et al. 2020

Polymer International

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A polyurethane (PU) hydrophobic coating was prepared by the two-component method, polycarbonate diol and isophorone diisocyanate becoming a two-phase composition. The PU films with hydrophobic surface were prepared by establishing a rough structure on the surface of silica (SiO 2 ) modified with silane coupling agents (γ-(2,3-epoxypropoxy)propytrimethoxysilane (KH560) and (heptadecafluoro-1,1,2,2-tetradecyl)trimethoxysilane (FAS)). First, the surface of SiO 2 was covered by a layer of hydrophobic methyl and fluorocarbon (C-F) groups. Then, the SiO 2 and modified SiO 2 were obtained by the introduction of KH560 and FAS with the silanol reaction by ultrasonic stirring. The effect of SiO 2 and modified SiO 2 on the structure and hydrophobic properties of PU was investigated by a series of test instruments. The results showed that the introduction of SiO 2 and modified SiO 2 was beneficial for increasing the roughness of the PU coating surface; the roughness of FAS/SiO 2 -PU could reach up to 14.790 nm, four times better than pure PU. A hydrophobic modified PU coating with water contact angle 123°was fabricated by using the hydrophobic C-F group FAS as a low surface energy material and establishing a micro rough structure on the surface of PU. Moreover, PU modified with KH560 and FAS can reduce the glass transition temperature (T g ) of soft segments, resulting in improvement of micro-phase separation.

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Effect of Polyvinyl Alcohol Modified Silica Particles on the Physical and Gas Separation Properties of the Polyurethane Mixed Matrix Membranes

Cited by 15 publications

References 55 publications

Investigation of the Gas Separation Properties of Polyurethane Membranes in Presence of Boehmite Nanoparticles

Investigation of the Gas Separation Properties of Polyurethane Membranes in Presence of Boehmite Nanoparticles

Dispersibility of Poly(vinyl acetate) Modified Silica Nanoparticles in Carbon Dioxide with Several Cosolvents

Preparation and properties of fluorinated silicon two‐component polyurethane hydrophobic coatings

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