1
|
Loianno V, Baldanza A, Scherillo G, Musto P, Mensitieri G. Sorption of CO 2, CH 4 and Their Mixtures in Amorphous Poly(2,6-dimethyl-1,4-phenylene)oxide (PPO). Polymers (Basel) 2023; 15:polym15051144. [PMID: 36904384 PMCID: PMC10007344 DOI: 10.3390/polym15051144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 02/12/2023] [Accepted: 02/21/2023] [Indexed: 03/02/2023] Open
Abstract
Sorption of pure CO2 and CH4 and CO2/CH4 binary gas mixtures in amorphous glassy Poly(2,6-dimethyl-1,4-phenylene) oxide (PPO) at 35 °C up to 1000 Torr was investigated. Sorption experiments were carried out using an approach that combines barometry with FTIR spectroscopy in the transmission mode to quantify the sorption of pure and mixed gases in polymers. The pressure range was chosen to prevent any variation of the glassy polymer density. The solubility within the polymer of the CO2 present in the gaseous binary mixtures was practically coincident with the solubility of pure gaseous CO2, up to a total pressure of the gaseous mixtures equal to 1000 Torr and for CO2 mole fractions of ~0.5 mol mol-1 and ~0.3 mol mol-1. The Non-Equilibrium Thermodynamics for Glassy Polymers (NET-GP) modelling approach has been applied to the Non-Random Hydrogen Bonding (NRHB) lattice fluid model to fit the solubility data of pure gases. We have assumed here that no specific interactions were occurring between the matrix and the absorbed gas. The same thermodynamic approach has been then used to predict the solubility of CO2/CH4 mixed gases in PPO, resulting in a deviation lower than 9.5% from the experimental results for CO2 solubility.
Collapse
Affiliation(s)
- Valerio Loianno
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Piazzale Tecchio 80, 80125 Naples, Italy
| | - Antonio Baldanza
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Piazzale Tecchio 80, 80125 Naples, Italy
| | - Giuseppe Scherillo
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Piazzale Tecchio 80, 80125 Naples, Italy
| | - Pellegrino Musto
- Institute for Polymers, Composites and Biomaterials, National Research Council of Italy, Via Campi Flegrei 34, 80078 Pozzuoli, Italy
| | - Giuseppe Mensitieri
- Institute for Polymers, Composites and Biomaterials, National Research Council of Italy, Via Campi Flegrei 34, 80078 Pozzuoli, Italy
- Reference Centre for Transformation Technology of Polymeric and Composite Materials, Italian Interuniversity Consortium on Materials Science and Technology (INSTM), Piazzale Tecchio 80, 80125 Naples, Italy
- Correspondence: ; Tel.: +39-081-7682512
| |
Collapse
|
2
|
Tanis I, Brown D, Neyertz S, Vaidya M, Ballaguet JP, Duval S, Bahamdan A. Single-gas and mixed-gas permeation of N 2/CH 4 in thermally-rearranged TR-PBO membranes and their 6FDA-bisAPAF polyimide precursor studied by molecular dynamics simulations. Phys Chem Chem Phys 2022; 24:18667-18683. [PMID: 35894847 DOI: 10.1039/d1cp05511a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
High-performance polymers with polybenzoxazole (PBO) structures, formed via thermal rearrangement (TR) of aromatic polyimide precursors, have been developed for gas separation applications. The present work compares the transport of N2 and CH4 in a 6FDA-bisAPAF polyimide precursor and in its TR-PBO derivative using molecular dynamics (MD) simulations. The modelling closely mimicked the experimental approach by transforming a 6FDA-bisAPAF atomistic model into its corresponding TR-PBO structure via a specific algorithm. The densities and void spaces of both precursor and TR polymers were found to compare well to experimental data. An iterative technique was used to obtain the single-gas sorption isotherms of N2 and CH4 at 338.5 K in both polymers over a range of feed pressures up to and exceeding 65 bar. CH4 was systematically found to be more soluble than N2. Solubilities in both matrices were quite similar with those in TR-PBO being slightly higher due to its larger fraction of significant volume. Volume dilation analyses confirmed a higher resistance to plasticization for TR-PBO. Extended single-gas N2 and CH4 simulations and 2 : 1 binary CH4/N2 mixed-gas simulations were then conducted in both matrices at 338.5 K and at a pressure of ∼65 bar corresponding to natural gas processing conditions. Mixed-gas sorption was modelled using a modification of the aforementioned iterative method, which fixed the pressure and iterated to convergence the number of molecules of each type of penetrant. The gas diffusion coefficients were estimated using the Trajectory-Extending Kinetic Monte Carlo (TEKMC) procedure. As found experimentally, significantly higher diffusivities and permeabilities were observed in the TR polymer, which led to a slightly lower ideal N2/CH4 permselectivity for TR-PBO (∼2.6) when compared to its 6FDA-bisAPAF precursor (∼3.8). However, both models showed a reduced N2/CH4 separation efficiency under 2 : 1 binary CH4/N2 mixed-gas conditions bordering on the loss of selectivity. For 6FDA-bisAPAF, both permeabilities decreased in the mixed-gas case, but more for N2 than for CH4. For TR-PBO, the permeability of the faster N2 decreased while the permeability of the slower CH4 increased under mixed-gas conditions. This confirms that single-gas simulations are not sufficient for the prediction of the actual mixed-gas permselectivity behaviour in such polymers.
Collapse
Affiliation(s)
- Ioannis Tanis
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, Grenoble INP (Institute of Engineering and Management Univ. Grenoble Alpes), LEPMI, 38000 Grenoble, France.
| | - David Brown
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, Grenoble INP (Institute of Engineering and Management Univ. Grenoble Alpes), LEPMI, 38000 Grenoble, France.
| | - Sylvie Neyertz
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, Grenoble INP (Institute of Engineering and Management Univ. Grenoble Alpes), LEPMI, 38000 Grenoble, France.
| | - Milind Vaidya
- Saudi Aramco, Research & Development Center, Po. Box 62, Dhahran 31311, Saudi Arabia
| | - Jean-Pierre Ballaguet
- Saudi Aramco, Research & Development Center, Po. Box 62, Dhahran 31311, Saudi Arabia
| | - Sebastien Duval
- Saudi Aramco, Research & Development Center, Po. Box 62, Dhahran 31311, Saudi Arabia
| | - Ahmad Bahamdan
- Saudi Aramco, Research & Development Center, Po. Box 62, Dhahran 31311, Saudi Arabia
| |
Collapse
|
3
|
Browe MA, Landers J, Tovar TM, Mahle JJ, Balboa A, Gordon WO, Fukuto M, Karwacki CJ. Laponite-Incorporated UiO-66-NH 2-Polyethylene Oxide Composite Membranes for Protection against Chemical Warfare Agent Simulants. ACS APPLIED MATERIALS & INTERFACES 2021; 13:10500-10512. [PMID: 33606491 DOI: 10.1021/acsami.1c00397] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A strategy is developed to enhance the barrier protection of polyethylene oxide (PEO)-metal-organic framework (MOF) composite films against chemical warfare agent simulants. To achieve enhanced protection, an impermeable high-aspect-ratio filler in the form of Laponite RD (LRD) clay platelets was incorporated into a composite PEO film containing MOF UiO-66-NH2. The inclusion of the platelets aids in mitigating permeation of inert hydrocarbons (octane) and toxic chemicals (2-chloroethyl ethyl sulfide, 2-CEES) of dimensions/chemistry similar to prominent vesicant threats while still maintaining high water vapor transport rates (WVTR). By utilizing small-angle neutron scattering, small-angle X-ray scattering, and wide-angle X-ray scattering, the LRD platelet alignment of the films was determined, and the structure of the films was correlated with performance as a barrier material. Performance of the membranes against toxic chemical threats was assessed using permeation testing of octane and 2-CEES, a common simulant for the vesicant mustard gas, and breathability of the membranes was assessed using WVTR measurements. To assess their robustness, chemical exposure (in situ diffuse reflectance infrared Fourier transform spectroscopy) and mechanical (tensile strength) measurements were also performed. It was demonstrated that the barrier performance of the film upon inclusion of the LRD platelets exceeds that of other MOF-polymer composites found in the literature and that this approach establishes a new path for improving permselective materials for chemical protection applications.
Collapse
Affiliation(s)
- Matthew A Browe
- DEVCOM Chemical Biological Center, 8198 Blackhawk Rd., Aberdeen Proving Ground, Maryland 21010, United States
| | - John Landers
- DEVCOM Chemical Biological Center, 8198 Blackhawk Rd., Aberdeen Proving Ground, Maryland 21010, United States
- National Research Council, Washington, D.C. 20001, United States
| | - Trenton M Tovar
- DEVCOM Chemical Biological Center, 8198 Blackhawk Rd., Aberdeen Proving Ground, Maryland 21010, United States
- National Research Council, Washington, D.C. 20001, United States
| | - John J Mahle
- DEVCOM Chemical Biological Center, 8198 Blackhawk Rd., Aberdeen Proving Ground, Maryland 21010, United States
| | - Alex Balboa
- DEVCOM Chemical Biological Center, 8198 Blackhawk Rd., Aberdeen Proving Ground, Maryland 21010, United States
| | - Wesley O Gordon
- DEVCOM Chemical Biological Center, 8198 Blackhawk Rd., Aberdeen Proving Ground, Maryland 21010, United States
| | - Masafumi Fukuto
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Christopher J Karwacki
- DEVCOM Chemical Biological Center, 8198 Blackhawk Rd., Aberdeen Proving Ground, Maryland 21010, United States
| |
Collapse
|