The Effect of Molecular Weight on the Surface and Permeation of Poly(L-lactic acid)-Poly(ethylene glycol) Membrane with Activated Carbon Filler

Sidik, Afifah Muhamad; Othaman, Rizafizah; Anuar, Farah Hannan

doi:10.17576/jsm-2018-4706-13

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…For the unwashed PEG-modified sample, a sharp adsorption at 1100 cm –1 was observed, which corresponds to a −C–O–C– stretching vibration of PEG. 57 This peak is not present in the pure PNiPAAm and the sample with 30-day washing, indicating an almost complete removal of the porogen. It should be noted that a thorough washing process, comprising at least 3 days of rinsing with a substantial amount of water, is essential to entirely eliminate the porogen.…”

Section: Resultsmentioning

confidence: 96%

“…FT-IR analysis was used to confirm the presence (after polymerization) and complete removal (after washing) of PEG to ensure that there were no residues that could influence the subsequent gravimetric experiments (Figure S1). For the unwashed PEG-modified sample, a sharp adsorption at 1100 cm –1 was observed, which corresponds to a −C–O–C– stretching vibration of PEG . This peak is not present in the pure PNiPAAm and the sample with 30-day washing, indicating an almost complete removal of the porogen.…”

Section: Resultsmentioning

confidence: 99%

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Porosity Engineering of Dried Smart Poly(N-isopropylacrylamide) Hydrogels for Gas Sensing

Wang,

Jiao,

Gerlach

et al. 2023

Biomacromolecules

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A recent study unveiled the potential of acrylamidebased stimulus-responsive hydrogels for volatile organic compound detection in gaseous environments. However, for gas sensing, a large surface area, that is, a highly porous material, offering many adsorption sites is crucial. The large humidity variation in the gaseous environment constitutes a significant challenge for preserving an initially porous structure, as the pores tend to be unstable and irreversibly collapse. Therefore, the present investigation focuses on enhancing the porosity of smart PNiPAAm hydrogels under the conditions of a gaseous environment and the preservation of the structural integrity for long-term use. We have studied the influence of polyethylene glycol (PEG) as a porogen and the application of different drying methods and posttreatment. The investigations lead to the conclusion that only the combination of PEG addition, freeze-drying, and subsequent conditioning in high relative humidity enables a long-term stable formation of a porous surface and inner structure of the material. The significantly enhanced swelling response in a gaseous environment and in the test gas acetone is confirmed by gravimetric experiments of bulk samples and continuous measurements of thin films on piezoresistive pressure sensor chips. These measurements are furthermore complemented by an in-depth analysis of the morphology and microstructure. While the study was conducted for PNiPAAm, the insights and developed processes are general in nature and can be applied for porosity engineering of other smart hydrogel materials for VOC detection in gaseous environments.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Porosity Engineering of Dried Smart Poly(N-isopropylacrylamide) Hydrogels for Gas Sensing

Wang,

Jiao,

Gerlach

et al. 2023

Biomacromolecules

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PBAT-based Microfiltration Membranes Using Porogen Saturated Solutions: Architecture, Morphology, and Environmental Profile

et al. 2021

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The prospect of synthesis of PES/PEG blend membranes using blend NMP/DMF for CO2/N2 separation

et al. 2021

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Carbon dioxide (CO2) emissions have been the root cause for anthropogenic climate change. Decarbonisation strategies, particularly carbon capture and storage (CCS) are crucial for mitigating the risk of global warming. Among all current CO2 separation technologies, membrane separation has the biggest potential for CCS as it is inexpensive, highly efficient, and simple to operate. Polymeric membranes are the preferred choice for the gas separation industry due to simpler methods of fabrication and lower costs compared to inorganic or mixed matrix membranes (MMMs). However, plasticisation and upper-bound trade-off between selectivity and permeability has limited the gas separation performance of polymeric membranes. Recently, researchers have found that the blending of glassy and rubbery polymers can effectively minimise trade-off between selectivity and permeability. Glassy poly(ethersulfone) (PES) and rubbery poly(ethylene) glycol (PEG) are polymers that are known to have a high affinity towards CO2. In this paper, PEG and PES are reviewed as potential polymer blend that can yield a final membrane with high CO2 permeance and CO2/nitrogen (N2) selectivity. Gas separation properties can be enhanced by using different solvents in the phase-inversion process. N-Methyl-2-Pyrrolidone (NMP) and Dimethylformamide (DMF) are common industrial solvents used for membrane fabrication. Both NMP and DMF are reviewed as prospective solvent blend that can improve the morphology and separation properties of PES/PEG blend membranes due to their effects on the membrane structure which increases permeation as well as selectivity. Thus, a PES/PEG blend polymeric membrane fabricated using NMP and DMF solvents is believed to be a major prospect for CO2/N2 gas separation.

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The Effect of Molecular Weight on the Surface and Permeation of Poly(L-lactic acid)-Poly(ethylene glycol) Membrane with Activated Carbon Filler

Abstract: ABSTRACT

Cited by 6 publications

References 15 publications

Porosity Engineering of Dried Smart Poly(N-isopropylacrylamide) Hydrogels for Gas Sensing

Porosity Engineering of Dried Smart Poly(N-isopropylacrylamide) Hydrogels for Gas Sensing

PBAT-based Microfiltration Membranes Using Porogen Saturated Solutions: Architecture, Morphology, and Environmental Profile

The prospect of synthesis of PES/PEG blend membranes using blend NMP/DMF for CO2/N2 separation

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