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Non-Solvent- and Temperature-Induced Phase Separations of Polylaurolactam Solutions in Benzyl Alcohol as Methods for Producing Microfiltration Membranes. COLLOIDS AND INTERFACES 2023. [DOI: 10.3390/colloids7010010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The possibility of obtaining porous films through solutions of polylaurolactam (PA12) in benzyl alcohol (BA) was considered. The theoretical calculation of the phase diagram showed the presence of the upper critical solution temperature (UCST) for the PA12/BA system at 157 °C. The PA12 completely dissolved in BA at higher temperatures, but the resulting solutions underwent phase separation upon cooling down to 120–140 °C because of the PA12’s crystallization. The viscosity of the 10–40% PA12 solutions increased according to a power law but remained low and did not exceed 5 Pa·s at 160 °C. Regardless of the concentration, PA12 formed a dispersed phase when its solutions were cooled, which did not allow for the obtention of strong films. On the contrary, the phase separation of the 20–30% PA12 solutions under the action of a non-solvent (isopropanol) leads to the formation of flexible microporous films. The measurement of the porosity, wettability, strength, permeability, and rejection of submicron particles showed the best results for a porous film produced from a 30% solution by non-solvent-induced phase separation. This process makes it possible to obtain a membrane material with a 240 nm particle rejection of 99.6% and a permeate flow of 1.5 kg/m2hbar for contaminated water and 69.9 kg/m2hbar for pure water.
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Sheikh M, Reig M, Vecino X, Lopez J, Rezakazemi M, Valderrama C, Cortina J. Liquid–Liquid membrane contactors incorporating surface skin asymmetric hollow fibres of poly(4-methyl-1-pentene) for ammonium recovery as liquid fertilisers. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.120212] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Liang T, Liu J, Wei Z, Shi D. Preparation of porous polyamide 6(PA6)membrane with copper oxide (CuO) nanoparticles selectively localized at the wall of the pores via reactive extrusion. NANO MATERIALS SCIENCE 2021. [DOI: 10.1016/j.nanoms.2021.09.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Kostyuk AV, Smirnova NM, Antonov SV, Ilyin SO. Rheological and Adhesion Properties of Hot-Melt Adhesives Based on Hydrocarbon Resins and Poly(ethylene-vinyl acetate). POLYMER SCIENCE SERIES A 2021. [DOI: 10.1134/s0965545x21030081] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Park A, Song Y, Yi E, Duy Nguyen BT, Han D, Sohn E, Park Y, Jung J, Lee YM, Cho YH, Kim JF. Blood Oxygenation Using Fluoropolymer-Based Artificial Lung Membranes. ACS Biomater Sci Eng 2020; 6:6424-6434. [PMID: 33449658 DOI: 10.1021/acsbiomaterials.0c01251] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Artificial lung (AL) membranes are used for blood oxygenation for patients undergoing open-heart surgery or acute lung failures. Current AL technology employs polypropylene and polymethylpentene membranes. Although effective, these membranes suffer from low biocompatibility, leading to undesired blood coagulation and hemolysis over a long term. In this work, we propose a new generation of AL membranes based on amphiphobic fluoropolymers. We employed poly(vinylidene-co-hexafluoropropylene), or PVDF-co-HFP, to fabricate macrovoid-free membranes with an optimal pore size range of 30-50 nm. The phase inversion behavior of PVDF-co-HFP was investigated in detail for structural optimization. To improve the wetting stability of the membranes, the fabricated membranes were coated using Hyflon AD60X, a type of fluoropolymer with an extremely low surface energy. Hyflon-coated materials displayed very low protein adsorption and a high contact angle for both water and blood. In the hydrophobic spectrum, the data showed an inverse relationship between the surface free energy and protein adsorption, suggesting an appropriate direction with respect to biocompatibility for AL research. The blood oxygenation performance was assessed using animal sheep blood, and the fabricated fluoropolymer membranes showed competitive performance to that of commercial polyolefin membranes without any detectable hemolysis. The data also confirmed that the bottleneck in the blood oxygenation performance was not the membrane permeance but rather the rate of mass transfer in the blood phase, highlighting the importance of efficient module design.
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Affiliation(s)
- Ahrumi Park
- Membrane Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 305-600, Republic of Korea
| | - Yejin Song
- Membrane Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 305-600, Republic of Korea
| | - Eunsung Yi
- Membrane Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 305-600, Republic of Korea.,University of Science and Technology (UST), Daejeon 305-350, Republic of Korea
| | - Bao Tran Duy Nguyen
- Department of Energy and Chemical Engineering, Incheon National University, Incheon 22012, Republic of Korea
| | - Dongje Han
- Interface Material and Chemical Engineering Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 305-600, Republic of Korea.,School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Republic of Korea
| | - EunHo Sohn
- Interface Material and Chemical Engineering Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 305-600, Republic of Korea.,University of Science and Technology (UST), Daejeon 305-350, Republic of Korea
| | - YouIn Park
- Membrane Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 305-600, Republic of Korea
| | - JunTae Jung
- Department of Energy Engineering, Hanyang University, Seoul 133-791, Republic of Korea
| | - Young Moo Lee
- Department of Energy Engineering, Hanyang University, Seoul 133-791, Republic of Korea
| | - Young Hoon Cho
- Membrane Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 305-600, Republic of Korea
| | - Jeong F Kim
- Innovation Center for Chemical Engineering, Incheon National University, Incheon 22012, Republic of Korea.,Department of Energy and Chemical Engineering, Incheon National University, Incheon 22012, Republic of Korea
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Formation of Microfiltration Membranes from PMP/PIB Blends: Effect of PIB Molecular Weight on Membrane Properties. MEMBRANES 2020; 10:membranes10010009. [PMID: 31947785 PMCID: PMC7022575 DOI: 10.3390/membranes10010009] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 12/31/2019] [Accepted: 12/31/2019] [Indexed: 11/25/2022]
Abstract
A series of microfiltration membranes were fabricated by the extraction of polyisobutylene (PIB) from its immiscible blends with polymethylpentene (PMP). Three PIB with different molecular weight of 7.5 × 104 (Oppanol B15), 34 × 104 (Oppanol B50) and 110 × 104 (Oppanol B100) g/mol, respectively, were used to evaluate the effect of molecular weight on the porous structure and transport properties of resulting PMP-based membranes. To mimic the conditions of 3D printing, the flat-sheet membranes were fabricated by means of melting of mixtures of various PMP and PIB concentrations through the hot rolls at 240 °C followed by a quick cooling. The rheology study of individual components and blends at 240 °C revealed that PIB B50 possessed the most close flow curve to the pure PMP, and their blends demonstrated the lowest viscosity comparing to the compositions made of PIB with other molecular weights (B15 or B100). SEM images of the cross-section PMP membranes after PIB extraction (PMP/PIB = 55/45) showed that the use of PIB B50 allowed obtaining the sponge-like porous structure, whereas the slit-shaped pores were found in the case of PIB B15 and PIB B100. Additionally, PMP/B50 blends demonstrated the optimum combinations of mechanical properties (σstr = 9.1 MPa, E = 0.20 GPa), adhesion to steel (σadh = 0.8 kPa) and retention performance (R240 nm = 99%, R38 nm = 39%). The resulting membranes were non- or low-permeable for water if the concentration of PIB B50 in the initial blends was 40 wt.% or lower. The optimal filtration performance was observed in the case of PMP/B50 blends with a ratio of 55/45 (Pwater = 1.9 kg/m2hbar, R240 nm = 99%, R38 nm = 39%) and 50/50 (Pwater = 1100 kg/m2hbar, R240 nm = 91%, R38 nm = 36%).
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