Effect of immobilizing adsorption on the diffusion time lag

Paul, D. R.

doi:10.1002/pol.1969.160071015

Cited by 123 publications

(51 citation statements)

References 12 publications

(7 reference statements)

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“…One upstream volume contains a solute like oxygen, initially at a concentration of C . The other, downstream volume, which initially 10 1957;Finger et al, 1960;Paul, 1969;Paul and Kemp, 1973;Paul and Ko-6 D ros, 1976 Daynes, 1920;Frisch, 1957;Crank, . 1975 C AP l l 1997 .…”

Section: Theorymentioning

confidence: 96%

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Oxygen barriers that use free radical chemistry

Yang¹,

Cussler²

2001

AIChE Journal

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Section: Theorymentioning

confidence: 96%

“…One strong example of earlier investigation assumes that the solute is rapidly adsorbed by sites within the membrane. When this adsorption follows a Langmuir isotherm, the concentra-Ž tion varies as follows Finger et al, 1960;Paul, 1969;Paul and Kemp, 1973;Paul and Koros, 1976;Vant-Hull and No-. ble, 1991…”

Section: Theorymentioning

confidence: 98%

Oxygen barriers that use free radical chemistry

Yang¹,

Cussler²

2001

AIChE Journal

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“…By 1973, D. R. Paul and D. R. Kemp recognized the effect that zeolites would have in gas adsorption in zeolite/polymer membranes by immobilizing gas molecules in the membrane and therefore increasing the time lag [111,112]. By adapting their work on gas diffusion, using Henry's law to describe the adsorption of mobile species, and utilizing Langmuir sorption to describe sorption of the immobile species, they developed a modified time lag model for gas transport in the transient state (i.e., before reaching the steady state), useful for the determination of diffusivity in zeolite/polymer membranes and in barrier membranes for coatings and packaging materials [113]. In 1987, H. J.…”

Section: Mixed-matrix Membrane Originsmentioning

confidence: 99%

Origins and Evolution of Inorganic-Based and MOF-Based Mixed-Matrix Membranes for Gas Separations

et al. 2016

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Abstract:Gas separation for industrial, energy, and environmental applications requires low energy consumption and small footprint technology to minimize operating and capital costs for the processing of large volumes of gases. Among the separation methods currently being used, like distillation, amine scrubbing, and pressure and temperature swing adsorption, membrane-based gas separation has the potential to meet these demands. The key component, the membrane, must then be engineered to allow for high gas flux, high selectivity, and chemical and mechanical stability at the operating conditions of feed composition, pressure, and temperature. Among the new type of membranes studied that show promising results are the inorganic-based and the metal-organic framework-based mixed-matrix membranes (MOF-MMMs). A MOF is a unique material that offers the possibility of tuning the porosity of a membrane by introducing diffusional channels and forming a compatible interface with the polymer. This review details the origins of these membranes and their evolution since the first inorganic/polymer and MOF/polymer MMMs were reported in the open literature. The most significant advancements made in terms of materials, properties, and testing conditions are described in a chronological fashion.

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“…phases, and (c) complex transport mechanisms, e.g., interpreted as due to a "dual sorption mechanism." 4 In the previous study of a series of PVC/EVA-45 blends,' with increasing EVA content, a sharp increase in permeability and diffusivity was observed at 7-8% EVA by weight. This was interpreted as an effect of a phase inversion in the blends at this EVA content.…”

Section: Introductionmentioning

confidence: 93%

Gas permeation of polymer blends. I. PVC/ethylene–vinyl acetate copolymer (EVA)

Shur

Rånby

1975

J of Applied Polymer Sci

107

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SynopsisThe transport behavior of 0 2 and N2 were studied for series of physical blends of PVC with EVA having different vinyl acetate (VAc) contents in the EVA (45 and 65 wt-%) and using different milling temperatures (160" and 185°C). The polymer blends were further characterized by dynamic mechanical measurements, density measurements, and x-ray diffraction. At higher VAc content in EVA and with higher milling temperature, the rate of permeation ( P ) and the rate of diffusion (D) decrease, and the activation energy of D (from Arrhenius plots) increases. Furthermore, the experimental density values of PVC/EVA-45 blends agree well with calculated values, assuming volume additivity of the two components, while those of PVC/ EVA45 blends are higher than the calculated densities. These results are interpreted as due to denser packing of polymer molecules and increased PVC-EVA interaction at higher VAc content and with higher milling temperature, indicating better compatibility between the blend components.Sharp increases in P and D values a t about 7.5% EVA (by weight) are found for PVC/EVA-45 blends (in agreement with our previous work) but not for PVC/EVA-65 blends. This is interpreted as due to a phase inversion at increasing EVA content in the former blends but not in the latter blends. The dynamic mechanical measurements show that the PVC/EVA-65 blends milled at 16OOC behave largely as semicompatible systems with maximum interaction between the two polymers at compositions of about 50/50 by weight.The x-ray diffraction data give no evidence of crystatllinity.

show abstract

Effect of immobilizing adsorption on the diffusion time lag

Cited by 123 publications

References 12 publications

Oxygen barriers that use free radical chemistry

Oxygen barriers that use free radical chemistry

Origins and Evolution of Inorganic-Based and MOF-Based Mixed-Matrix Membranes for Gas Separations

Gas permeation of polymer blends. I. PVC/ethylene–vinyl acetate copolymer (EVA)

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