Gas‐transport properties in crosslinked polymers. I. Aliphatic polyurethane–acrylate‐based adhesives

Tiemblo, Pilar; Guzmán, Julio; Riande, Evaristo; Salvador, Enrique F.; Peinado, C.

doi:10.1002/1099-0488(20010401)39:7<786::aid-polb1053>3.0.co;2-#

Cited by 12 publications

(7 citation statements)

References 20 publications

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“…A laboratory-made permeator, described elsewhere, , was used for permeation measurements. Briefly, it consists of a gas cell in which the polymer membrane is placed in the center, separating the high-pressure or upstream chamber from the low-pressure or downstream chamber.…”

Section: Methodsmentioning

confidence: 99%

Determination of Gas Transport Coefficients of Mixed Gases in 6FDA-TMPDA Polyimide by NMR Spectroscopy

et al. 2017

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The solubility and diffusion coefficients of pure carbon dioxide and its mixtures with methane, ethylene, and propylene in poly(4,4′-hexafluoroisopropylidene diphthalic anhydride-2,3,5,6-tetramethyl-1,4-phenylenediamine) (6FDA-TMPDA) membranes were determined with proton and 13 C NMR spectroscopy and pulsed-field gradient NMR, respectively. In addition, the solubility and permeability of the pure gases in the polyimide membranes were also measured by sorption and permeation methods. The results showed that NMR measurements on pure gases are very reproducible and in relatively good agreement with those determined by the other methods. Furthermore, the NMR method allows the independent measurement of the solubility and diffusion coefficients for each component in mixtures of two or three gases and subsequently the gas permeability. The main conclusion of this work is that NMR spectroscopy is a suitable tool to determine all transport coefficients of multicomponent gas mixtures in polymer membranes, provided that gas molecules contain NMR observable nuclei.

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Section: Methodsmentioning

confidence: 99%

Determination of Gas Transport Coefficients of Mixed Gases in 6FDA-TMPDA Polyimide by NMR Spectroscopy

et al. 2017

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“…As the diffusivity of oxygen in the UV curable resin is relatively low (e.g. oxygen diffusivity D PUA ¼ 10 À13 -10 À12 m 2 s À1 ), 37 oxygen may not penetrate deeply into the polymer layer. Therefore, the inside of the resin would be cured completely as opposed to the top surface.…”

Section: Principles Of Two-step Uv-assisted Cflmentioning

confidence: 99%

UV-assisted capillary force lithography for engineering biomimetic multiscale hierarchical structures: From lotus leaf to gecko foot hairs

et al. 2009

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This feature article provides an overview of the recently developed two-step UV-assisted capillary force lithography and its application to fabricating well-defined micro/nanoscale hierarchical structures. This method utilizes an oxygen inhibition effect in the course of UV irradiation curing and a two-step moulding process, to form multiscale hierarchical or suspended nanobridge structures in a rapid and reproducible manner. After a brief description of the fabrication principles, several examples of the two-step UV-assisted moulding technique are presented. In addition, emerging applications of the multiscale hierarchical structures are briefly described.

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“…Over the past few years, the study of gas diffusion in polymeric matrices based on their chemical structure holds extraordinary technological importance in the design of barrier and membrane materials. − One attractive approach in order to develop new polymeric membranes is modifying existing polymers, mainly due to its simplicity, reproducibility, and low cost. It is well-known that gas permeability of polymeric materials can be improved by restricting the motion of polymer chains. , This can be achieved in several ways such as, reducing the concentration of flexible linkages in the backbone, , attaching bulky side groups, − and cross-linking polymer chains. − Following these ideas, it is possible to prepare new materials with enhanced gas separation performance.…”

Section: Introductionmentioning

confidence: 99%

Free Volume Analysis and Transport Mechanisms of PVC Modified with Fluorothiophenol Compounds. A Molecular Simulation Study

Sacristán

Mijangos

2010

Macromolecules

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Molecular dynamics simulations using fully atomistic models were conducted to investigate gas transport mechanism and its connection to the free volume distribution and morphology in polyvinyl chloride (PVC) and in PVC modified with 4-fluorothiophenol. The influence of both, modification degree and temperature on diffusion mechanism was thoroughly studied. The diffusion coefficients of O 2 and N 2 were determined via molecular dynamics simulation using the COMPASS forcefield over a range of temperatures (375, 400, 425, and 450 K) using up to 200 ns simulation time. The introduction of pendant bulky groups along the polymer backbone results in a less ordered polymer matrix increasing the free volume available and consequently the diffusion coefficients of both gases, O 2 and N 2 . Additionally, the temperature range selected in this work allows us to investigate the crossover from a solid-like diffusion mechanism (at low temperatures) to a liquid-like mechanism that takes place at higher temperatures. The gas transport coefficients of these polymers obtained from MD simulations were compared with previously reported values in literature based on both experimental and simulation studies, and the results obtained were within the expectations indicating the viability of the approach.

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Gas‐transport properties in crosslinked polymers. I. Aliphatic polyurethane–acrylate‐based adhesives

Cited by 12 publications

References 20 publications

Determination of Gas Transport Coefficients of Mixed Gases in 6FDA-TMPDA Polyimide by NMR Spectroscopy

Determination of Gas Transport Coefficients of Mixed Gases in 6FDA-TMPDA Polyimide by NMR Spectroscopy

UV-assisted capillary force lithography for engineering biomimetic multiscale hierarchical structures: From lotus leaf to gecko foot hairs

Free Volume Analysis and Transport Mechanisms of PVC Modified with Fluorothiophenol Compounds. A Molecular Simulation Study

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