A CO2-selective molecular gate of poly(amidoamine) dendrimer immobilized in a poly(ethylene glycol) network

Taniguchi, Ikuo; Urai, Hiromi; Kai, Teruhiko; Duan, Shuhong; Kazama, S.

doi:10.1016/j.memsci.2013.05.017

Cited by 20 publications

(20 citation statements)

References 11 publications

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“…The previous report [11] explains that primary amine of PAMAM dendrimer helps sorption of CO 2 , which turns bicarbonate ion and carbamate. On the other hand, tertiary amine does not provide an opportunity to form carbamate due to the steric hindrance.…”

Section: Preparation Of Modified Pamam Dendrimermentioning

confidence: 93%

“…With the membranes from modified dendrimer and epoxy-PEG, the selectivity is enhanced upon humidification, while the gas permeance decreases. The obtained results suggest that the nano-thick membranes would have a defect because PAMAM dendrimer-containing membranes show enhanced CO 2 separation properties upon humidification with the formation of bicarbonate, which is the major migrating species [11]. Further enhancement of the CO 2 separation performance would be possible when the surface is coated with a protective layer, such as poly(dimethylsiloxiane), to seal a defect.…”

Section: Co 2 Separation Properties Of Nano-thick Membranesmentioning

confidence: 94%

“…The polymeric membranes become hydrogel-like structure by absorbing water vapor under the conditions. When CO 2 comes to the membrane surface, a part of CO 2 turns to bicarbonate ion, which is the major migrating species across the membranes, while the rest of CO 2 reacts to primary amines of the dendrimer to form carbamate ion pairs, which results in the formation of quasi-crosslinks of the dendritic molecules [11]. As a consequence, the increase in crosslinking density suppresses H 2 permeation to give the excellent CO 2 separation properties as a so-called CO 2 selective molecular gate effect [1].…”

Section: Preparation Of Modified Pamam Dendrimermentioning

confidence: 99%

See 2 more Smart Citations

CO2 Separation with Nano-thick Polymeric Membrane for Pre- combustion

Taniguchi

Fujikawa

2014

Energy Procedia

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Poly(amidoamine) (PAMAM) dendrimers exhibit quite high specificity toward CO 2 and have been used for CO 2 separation materials in membrane separation. PAMAM dendrimers are chemically immobilized by the reaction with epoxide-bearing poly(ethylene glycol)s (epoxy-PEGs). The reaction mixture is cast on a pre-treated substrate by spin-coating manner to form a nano-thick self-standing membrane. The membrane thickness is readily controlled by changing the spin-coating conditions and the reactant concentrations. The resulting nano-thick membranes show preferential CO 2 permeation over H 2 with very high CO 2 permeance. Although the CO 2 selectivity is not high, reduction of membrane thickness would be an approach to enhance CO 2 permeability

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Section: Preparation Of Modified Pamam Dendrimermentioning

confidence: 93%

Section: Co 2 Separation Properties Of Nano-thick Membranesmentioning

confidence: 94%

Section: Preparation Of Modified Pamam Dendrimermentioning

confidence: 99%

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CO2 Separation with Nano-thick Polymeric Membrane for Pre- combustion

Taniguchi

Fujikawa

2014

Energy Procedia

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“…PAMAM dendrimer is a basic molecule that would facilitate conversion of CO2 into a bicarbonate ion in the presence of H2O. CO2 absorption and transport in the form of a bicarbonate ion were facilitated by the PAMAM dendrimer in the presence of H2O [13,14] . CO2 is a weak acidic gas that is absorbed into a solvent containing the amine, (a weak base), where RNHCOO -is carbamate ion which is formed with both primary and secondary amines, but tertiary amines (and hindered amines) form the bicarbonate ion in a reaction with water.…”

Section: Eeffect Of Additives On Co2 Separation Propertiesmentioning

confidence: 99%

Development of Poly(Amidoamine) Dendrimer/ Poly(Ethylene Glycol) Hybrid Membranes for CO2 Capture at Elevated Pressures

et al. 2014

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To improve CO2 separation performance of Poly (amidoamine) (PAMAM) dendrimer at pressure difference conditions, hybrid membranes have been developed by immobilizing of PAMAM dendrimer into a cross-linked poly(ethylene glycol) dimethacrylate (PEGDMA) polymer matrix. A multifunctional cross-linker (MFX) such as trimethylolpropane trimethacrylate (TMPTMA) was used to enhance membrane separation performance at elevated pressures. The resulting hybrid membrane PAMAM dendrimer / PEGDMA/TMPTMA hybrid membrane exhibited an excellent CO2/H2 selectivity of 30 and above with CO2 permeance of 2.1×10 −12 m 3 (STP)/(m 2 s Pa) at 660 kPa CO2 partial under 820 kPa feed pressure with 80% relative humidity at 40 °C. The PAMAM dendrimer/cross-linked PEG hybrid membrane shows great potential for CO2 separation from H2 in high pressure applications, such as IGCC process. A compatible crosslinker (CPC) was used to prepare the composite membrane with a thin selectivity layer to enhance CO2 permeance. An isopropyl alkyl hindered amine IAM, tertiary amine TA1 and TA2 were added to the formation solution of membrane for investigating the effect of additive on CO2 separation performance.

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“…CO 2 absorbed in the membrane turns to bicarbonate ion and carbamate with primary amines of PAMAM dendrimer under the conditions. The former is a major migrating species through the membrane, while the latter results in the formation of quasi-crosslinking of PAMAM, which suppresses H 2 permeation, to give a high selectivity [10]. However, permeability of CO 2 should be enhanced for use such as in an integrated gasification combined cycle (IGCC) plant [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

A compatible crosslinker for enhancement of CO2 capture of poly(amidoamine) dendrimer-containing polymeric membranes

Taniguchi¹,

Kai

Duan

et al. 2015

Journal of Membrane Science

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a b s t r a c tPoly(amidoamine) (PAMAM) dendrimers are physically immobilized in a crosslinked poly(ethylene glycol) (PEG) upon photopolymerization of PEG dimethacrylates (PEGDMAs) in the presence of the dendrimers in ethanol. The dendrimer-containing polymeric membranes exhibit excellent CO 2 separation properties over smaller H 2 . However, immiscibility of PEG matrix and the dendrimer results in the formation of a bicontinuous phase-separated structure on a couple of microns scale, which inhibits to reduce the membrane thickness for enhancement of the CO 2 permeability. A compatible crosslinker, 4GMAP, is developed from the dendrimer and glycidyl methacrylate. Incorporation of the compatible crosslinker in the photopolymerization suppresses the macrophase separation between PAMAM dendrimer and PEG matrix and allows preparation of polymeric membranes as thin as 10 μm with high CO 2 selectivity. The 4GMAP incorporation also endows pressure tolerance by increasing crosslinking density of the resulting polymeric membranes. The CO 2 permeance is elevated from 9.94 Â 10 À 13 to 1.68 Â 10 À 11 m 3 (STP) m À 2 s À 1 Pa À 1 , by reducing the membrane thickness from 640 to 9.5 μm with 10 of CO 2 selectivity at 313 K and 0.56 MPa of CO 2 partial pressure.

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A CO2-selective molecular gate of poly(amidoamine) dendrimer immobilized in a poly(ethylene glycol) network

Cited by 20 publications

References 11 publications

CO2 Separation with Nano-thick Polymeric Membrane for Pre- combustion

CO2 Separation with Nano-thick Polymeric Membrane for Pre- combustion

Development of Poly(Amidoamine) Dendrimer/ Poly(Ethylene Glycol) Hybrid Membranes for CO2 Capture at Elevated Pressures

A compatible crosslinker for enhancement of CO2 capture of poly(amidoamine) dendrimer-containing polymeric membranes

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