Carbon dioxide sorption and melting behaviour of mPEG-alkyne

López, Sonia; Ramos, María Jesús; García-Vargas, Jesús Manuel; Garcı́a, Marı́a Teresa; Rodrı́guez, Juan F.

doi:10.1016/j.supflu.2021.105182

Cited by 4 publications

(2 citation statements)

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“…Recent studies employing the Sanchez-Lacombe EoS in the study of gas/polymer systems can be found in [118][119][120][121]. Figure 4 is a representation of one the latest applications of the theory to the sorption of pure CO 2 in polydimethylsiloxane (PDMS), a rubbery membrane.…”

Section: Eos Models: Lattice Fluid Equations Of Statementioning

confidence: 99%

Modelling Sorption and Transport of Gases in Polymeric Membranes across Different Scales: A Review

2022

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Professor Giulio C. Sarti has provided outstanding contributions to the modelling of fluid sorption and transport in polymeric materials, with a special eye on industrial applications such as membrane separation, due to his Chemical Engineering background. He was the co-creator of innovative theories such as the Non-Equilibrium Theory for Glassy Polymers (NET-GP), a flexible tool to estimate the solubility of pure and mixed fluids in a wide range of polymers, and of the Standard Transport Model (STM) for estimating membrane permeability and selectivity. In this review, inspired by his rigorous and original approach to representing membrane fundamentals, we provide an overview of the most significant and up-to-date modeling tools available to estimate the main properties governing polymeric membranes in fluid separation, namely solubility and diffusivity. The paper is not meant to be comprehensive, but it focuses on those contributions that are most relevant or that show the potential to be relevant in the future. We do not restrict our view to the field of macroscopic modelling, which was the main playground of professor Sarti, but also devote our attention to Molecular and Multiscale Hierarchical Modeling. This work proposes a critical evaluation of the different approaches considered, along with their limitations and potentiality.

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Section: Eos Models: Lattice Fluid Equations Of Statementioning

confidence: 99%

Modelling Sorption and Transport of Gases in Polymeric Membranes across Different Scales: A Review

2022

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“…PEGs with MW > 2000 are hard crystalline solids with melting points around 63 • C at atmospheric pressure. Sorption of scCO 2 into a polymer can reduce its melting temperature (Tm) significantly below the one observed at atmospheric The Tm of the mPEG-alkyne in scCO 2 was between 37 and 43 • C, implying that at 35 • C the CO 2 is starting to act as a lubricant facilitating friction between the polymer chains and softening the polymer, allowing the mPEG-alkyne to start turning into a viscous liquid without the need for organic solvents or elevated temperatures [48]. In this sense, mPEG-alkyne could as main reagent and co-solvent when using scCO 2 as reaction media.…”

Section: Cuaac Model Reaction With Different Copper Structuresmentioning

confidence: 99%

Copper-Containing Catalysts for Azide–Alkyne Cycloaddition in Supercritical CO2

et al. 2022

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Background: Chemical industry has increased the investment into and innovation capacity to supply chemicals from safe and sustainable sources, which will be essential to offering new solutions and supporting the green transition of the global economy and society. In this sense, the use of green solvents and reusable heterogeneous catalysts has emerged as a promising sustainable process strategy for engineering, chemistry and the environment. In this work, different homogeneous (copper bromide, CuBr and copper(II) acetate, Cu (CH3COO)2·H2O) and heterogeneous (Cu Wire, Cu Plate, Cu/β-SiC, pre-treated Cu Wire and pre-treated Cu Plate) copper catalysts were tested for the copper(I)-catalyzed alkyne–azide cycloaddition (CuAAC) reaction. In addition, the influence of different reaction media was analyzed, comparing the use of an organic solvent such as toluene and a green solvent such as supercritical CO2 (scCO2). Methods: Characterization of the catalysts includes by X-ray diffraction (XRD), Scan Electron Microscopy (SEM), Atomic absorption spectrophotometry (AA) and Temperature Programmed Reduction (TPR). Parameters such as catalyst loading, reaction time, reusability and leaching of the catalysts were studied to obtain more information on the CuAAC reaction in scCO2. Results: The pre-treated copper plate achieved a 57% increase in reaction yield compared to the non pre-treated copper plate. However, the recovery and reuse of the pre-treated copper plate showed a severe deterioration and a considerable change in its surface. Cu Wire (without pre-treatment) achieved yields of up to 94.2% after reusing it for five cycles. Conclusions: These results suggest the possibility to exploit the combination of heterogeneous catalysts and scCO2 and justify further research to highlight green solvents and simultaneously address the challenges of reaction, purification and recycling.

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