Molecular and Physical Structure’s Designs of High Performance Polymeric Membranes

1994 ◽  
pp. 581-589
Author(s):  
Masaru Kurihara ◽  
Takao Aoki
Keyword(s):  
High Performance ◽  
Polymeric Membranes

scholarly journals Enhanced O2/N2 Separation of Mixed-Matrix Membrane Filled with Pluronic-Compatibilized Cobalt Phthalocyanine Particles

Membranes ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 75 ◽  
Author(s):  
S. A. S. C. Samarasinghe ◽  
Chong Yang Chuah ◽  
H. Enis Karahan ◽  
G. S. M. D. P. Sethunga ◽  
Tae-Hyun Bae
Keyword(s):  
High Performance ◽  
Polymeric Materials ◽  
Polymeric Membranes ◽  
Air Separation ◽  
Industrial Processes ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Interfacial Defects ◽  
The Matrix

Membrane-based air separation (O2/N2) is of great importance owing to its energy efficiency as compared to conventional processes. Currently, dense polymeric membranes serve as the main pillar of industrial processes used for the generation of O2- and N2-enriched gas. However, conventional polymeric membranes often fail to meet the selectivity needs owing to the similarity in the effective diameters of O2 and N2 gases. Meanwhile, mixed-matrix membranes (MMMs) are convenient to produce high-performance membranes while keeping the advantages of polymeric materials. Here, we propose a novel MMM for O2/N2 separation, which is composed of Matrimid® 5218 (Matrimid) as the matrix, cobalt(II) phthalocyanine microparticles (CoPCMPs) as the filler, and Pluronic® F-127 (Pluronic) as the compatibilizer. By the incorporation of CoPCMPs to Matrimid, without Pluronic, interfacial defects were formed. Pluronic-treated CoPCMPs, on the other hand, enhanced O2 permeability and O2/N2 selectivity by 64% and 34%, respectively. We explain the enhancement achieved with the increase of both O2 diffusivity and O2/N2 solubility selectivity.

Thermally Rearranged Poly(benzoxazole) Copolymer Membranes for Improved Gas Separation: A Review

2016 ◽  
Vol 69 (6) ◽  
pp. 601 ◽  
Author(s):  
Colin A. Scholes
Keyword(s):  
Gas Separation ◽  
High Performance ◽  
Polymeric Membranes ◽  
Separation Performance ◽  
Future Directions ◽  
Current State ◽  
Wide Range ◽  
Rearrangement Process ◽  
Superior Mechanical Properties ◽  
Review Reports

Polymeric membranes for gas separation have application in a wide range of industries such as natural gas sweetening and air enrichment. Recently, high-performance gas separation polymeric membranes have been developed based on a novel thermal rearrangement process that produces the resistant poly(benzoxazole) (TR-PBO). This review reports on the current state of the art TR-PBO membranes for gas separation and the underlying chemistry needed to achieve such high separation performance. Particular focus is applied to copolymers based on TR-PBO for membranes as these have attracted considerable research interest recently for their gas separation performance and superior mechanical properties compared with TR-PBO. Also included in this review is a discussion of the future directions of research on TR-PBO-based membranes for gas separation.

scholarly journals Structures, Properties, and Performances—Relationships of Polymeric Membranes for Pervaporative Desalination

Membranes ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 58 ◽  
Author(s):  
Nayan Singha ◽  
Mrinmoy Karmakar ◽  
Pijush Chattopadhyay ◽  
Sagar Roy ◽  
Mousumi Deb ◽  
...  
Keyword(s):  
High Performance ◽  
Wide Spectrum ◽  
Structural Features ◽  
Polymeric Membranes ◽  
Inorganic Membranes ◽  
Transport Mechanisms ◽  
Performance Potential ◽  
Global Demand ◽  
Commercial Applications ◽  
Mass Transport Mechanisms

For the fulfilment of increasing global demand and associated challenges related to the supply of clean-and-safe water, PV has been considered as one of the most attractive and promising areas in desalinating salty-water of varied salinities. In pervaporative desalination, the sustainability, endurance, and structural features of membrane, along with operating parameters, play the dominant roles and impart paramount impact in governing the overall PV efficiency. Indeed, polymeric- and organic-membranes suffer from several drawbacks, including inferior structural stability and durability, whereas the fabrication of purely inorganic membranes is complicated and costly. Therefore, recent development on the high-performance and cost-friendly PV membrane is mostly concentrated on synthesizing composite- and NCP-membranes possessing the advantages of both organic- and inorganic-membranes. This review reflects the insights into the physicochemical properties and fabrication approaches of different classes of PV membranes, especially composite- and NCP-membranes. The mass transport mechanisms interrelated to the specialized structural features have been discussed. Additionally, the performance potential and application prospects of these membranes in a wide spectrum of desalination and wastewater treatment have been elaborated. Finally, the challenges and future perspectives have been identified in developing and scaling up different high-performance membranes suitable for broader commercial applications.

scholarly journals Mechanism and Compatibility of Pretreated Lignocellulosic Biomass and Polymeric Mixed Matrix Membranes: A Review

Membranes ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 370
Author(s):  
Abiodun Abdulhameed Amusa ◽  
Abdul Latif Ahmad ◽  
Jimoh Kayode Adewole
Keyword(s):  
Lignocellulosic Biomass ◽  
High Performance ◽  
Polymeric Membranes ◽  
Hydroxyl Group ◽  
Mixed Matrix Membranes ◽  
Separation Performance ◽  
Polymer Modification ◽  
Mixed Matrix ◽  
Physical And Chemical ◽  
Matrix Membranes

In this paper, a review of the compatibility of polymeric membranes with lignocellulosic biomass is presented. The structure and composition of lignocellulosic biomass which could enhance membrane fabrications are considered. However, strong cell walls and interchain hindrances have limited the commercial-scale applications of raw lignocellulosic biomasses. These shortcomings can be surpassed to improve lignocellulosic biomass applications by using the proposed pretreatment methods, including physical and chemical methods, before incorporation into a single-polymer or copolymer matrix. It is imperative to understand the characteristics of lignocellulosic biomass and polymeric membranes, as well as to investigate membrane materials and how the separation performance of polymeric membranes containing lignocellulosic biomass can be influenced. Hence, lignocellulosic biomass and polymer modification and interfacial morphology improvement become necessary in producing mixed matrix membranes (MMMs). In general, the present study has shown that future membrane generations could attain high performance, e.g., CO2 separation using MMMs containing pretreated lignocellulosic biomasses with reachable hydroxyl group radicals.

scholarly journals Fabrication of High Performance PVDF Hollow Fiber Membrane Using Less Toxic Solvent at Different Additive Loading and Air Gap

Membranes ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 843
Author(s):  
Hazirah Syahirah Zakria ◽  
Mohd Hafiz Dzarfan Othman ◽  
Siti Hamimah Sheikh Abdul Kadir ◽  
Roziana Kamaludin ◽  
Asim Jilani ◽  
...  
Keyword(s):  
Hollow Fiber ◽  
Polyvinylidene Fluoride ◽  
High Performance ◽  
Hollow Fiber Membrane ◽  
Water Flux ◽  
Air Gap ◽  
Polymeric Membranes ◽  
Fiber Membrane ◽  
Peg 400 ◽  
Sustainable Environment

Existing toxic solvents in the manufacturing of polymeric membranes have been raising concerns due to the risks of exposure to health and the environment. Furthermore, the lower tensile strength of the membrane renders these membranes unable to endure greater pressure during water treatment. To sustain a healthier ecosystem, fabrication of polyvinylidene fluoride (PVDF) hollow fiber membrane using a less toxic solvent, triethyl phosphate (TEP), with a lower molecular weight polyethylene glycol (PEG 400) (0–3 wt.%) additive were experimentally demonstrated via a phase inversion-based spinning technique at various air gap (10, 20 and 30 cm). Membrane with 2 wt.% of PEG 400 exhibited the desired ultrafiltration asymmetric morphology, while 3 wt.% PEG 400 resulting microfiltration. The surface roughness, porosity, and water flux performance increased as the loading of PEG 400 increased. The mechanical properties and contact angle of the fabricated membrane were influenced by the air gap where 20 cm indicate 2.91 MPa and 84.72°, respectively, leading to a stronger tensile and hydrophilicity surface. Lower toxicity TEP as a solvent helped in increasing the tensile properties of the membrane as well as producing an eco-friendly membrane towards creating a sustainable environment. The comprehensive investigation in this study may present a novel composition for the robust structure of polymeric hollow fiber membrane that is suitable in membrane technology.

Multifunctional Cross-Linked Polymeric Membranes for Safe, High-Performance Lithium Batteries

2018 ◽  
Vol 30 (6) ◽  
pp. 2058-2066 ◽  
Author(s):  
Sanjuna Stalin ◽  
Snehashis Choudhury ◽  
Kaihang Zhang ◽  
Lynden A. Archer
Keyword(s):  
Lithium Batteries ◽  
High Performance ◽  
Polymeric Membranes

scholarly journals CO2-Philic [EMIM][Tf2N] Modified Silica in Mixed Matrix Membrane for High Performance CO2/CH4 Separation

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Siti Nur Alwani Shafie ◽  
Wen Xuan Liew ◽  
Nik Abdul Hadi Md Nordin ◽  
Muhammad Roil Bilad ◽  
Norazlianie Sazali ◽  
...  
Keyword(s):  
High Performance ◽  
Silica Particles ◽  
Polymeric Membranes ◽  
Membrane Properties ◽  
Mixed Matrix Membrane ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Chain Flexibility ◽  
Performance Results ◽  
Gas Separation Performance

Separation of carbon dioxide (CO2) from methane (CH4) using polymeric membranes is limited by trade-off between permeability and selectivity as depicted in Robeson curve. To overcome this challenge, this study develops membranes by incorporating silica particles (Si) modified with [EMIM][Tf2N] ionic liquid (IL) at different IL:Si ratio to achieve desirable membrane properties and gas separation performance. Results show that the IL:Si particle has been successfully prepared, indicated by the presence of fluorine and nitrogen elements, as observed via Fourier-Transform Infrared Spectroscopy (FTIR) and X-ray Photoelectron Spectrometer (XPS). Incorporation of the modified particles into membrane has given prominent effects on morphology and polymer chain flexibility. The mixed matrix membrane (MMM) cross-section morphology turns rougher in the presence of IL:Si during fracture due to higher loadings of silica particles and IL. Furthermore, the MMM becomes more flexible with IL presence due to IL-induced plasticization, independent of IL:Si ratio. The MMM with low IL content possesses CO2 permeance of 34.60 ± 0.26 GPU with CO2/CH4 selectivity of 85.10, which is far superior to a pure polycarbonate (PC) and PC-Sil membranes at 2 bar, which surpasses the Robeson Upper Bound. This higher CO2 selectivity is due to the presences of CO2-philic IL within the MMM system.

scholarly journals Novel Validated Analytical Method Based on Potentiometric Transduction for the Determination of Citicoline Psychostimulant/Nootropic Agent

Molecules ◽  
2020 ◽  
Vol 25 (15) ◽  
pp. 3512
Author(s):  
Ayman H. Kamel ◽  
Abd El-Galil E. Amr ◽  
Hoda R. Galal ◽  
Abdulrahman A. Almehizia
Keyword(s):  
High Performance ◽  
Ion Association ◽  
Pharmaceutical Formulations ◽  
Hplc Method ◽  
Polymeric Membranes ◽  
Nootropic Agent ◽  
High Potential Stability ◽  
First Time ◽  
Potential Stability

Herein, a novel validated potentiometric method is presented for the first time for citicoline determination. The method is based on measuring the potential using new constructed citicoline electrodes. The electrodes are based on the use of citicolinium/phosphomolybdate [Cit]2[PM] (sensor I) and citicolinium/tetraphenylborate [Cit][TPB] (sensor II) ion association complexes. These sensory materials were dispersed in plasticized polyvinyl chloride (PVC) polymeric membranes. The sensors revealed a Nernstian response with the slopes 55.9 ± 1.8(r2 = 0.9994) and 51.8 ± 0.9 (r2 = 0.9991) mV/decade over a linearity range of 6.3 × 10−6–1.0 × 10−3 and 1.0 × 10−5–1.0 × 10−3 M and detection limits of 3.16 × 10−6 and 7.1 × 10−6 M for sensors I and II, respectively. To ensure the existence of monovalent citicoline, all measurements were performed in 50 mM acetate buffer at pH 3.5. All presented electrodes showed good performance characteristics such as rapid response, good selectivity, high potential-stability and long life-span. Method verification and validation in terms of response linearity, quantification limit, accuracy, bias, trueness, robustness, within-day variability and between-days variability were evaluated. The method was introduced for citicoline determination in different pharmaceutical formulations and compared with the standard high performance liquid chromatography (HPLC) method.

Recent progress in development of high performance polymeric membranes and materials for metal plating wastewater treatment: A review

2016 ◽  
Vol 9 ◽  
pp. 78-110 ◽  
Author(s):  
Seyed Saeid Hosseini ◽  
Eugenio Bringas ◽  
Nicolas R. Tan ◽  
Inmaculada Ortiz ◽  
Maral Ghahramani ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
High Performance ◽  
Recent Progress ◽  
Polymeric Membranes ◽  
Metal Plating ◽  
Plating Wastewater
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