Membranes produced by wet-phase inversion method

1993 ◽  
Vol 1993 (41) ◽  
pp. 3-4
Keyword(s):  
Phase Inversion ◽  
Inversion Method ◽  
Wet Phase Inversion ◽  
Phase Inversion Method

Effects of Montmorillonite (MMT) Inorganic Fillers on Polyvinylidene (PVDF) Mixed Matrix Membrane

2014 ◽  
Vol 625 ◽  
pp. 696-700 ◽  
Author(s):  
Oh Pei Ching ◽  
Mason Wong Bak Lung
Keyword(s):  
Phase Inversion ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Inversion Method ◽  
Mixed Matrix ◽  
Pvdf Membrane ◽  
Dimethyl Acetamide ◽  
Wet Phase Inversion ◽  
Phase Inversion Method ◽  
Separation Performances

Asymmetric nanoclay-polyvinylidene (PVDF) mixed matrix membranes (MMMs) were prepared by the reaction of various amount of montmorillonite (MMT) nanoclay mineral with PVDF. The MMMs were fabricated via dry-wet phase inversion method withN,N-dimethyl-acetamide (DMAc) as the solvent and ethanol as the coagulant. The fabricated MMMs were characterized by means of fourier-transform infrared (FTIR) and scanning electron microscopy (SEM). The separation performances of the prepared membranes were evaluated by pure gases (CO2and CH4). From the FTIR spectrum, MMMs exhibited new peaks compared to pristine PVDF membrane, indicating assimilation of MMT into the PVDF membrane. The morphology of the membranes depends on the clay mineral loading as confirmed by SEM. PVDF/3wt% MMT MMM showed the highest CO2permeance and CO2/CH4selectivity relative to neat PVDF membrane.

Rheology Assessment of PSf/ NMP Solution and its Influence on Membrane Structure

2012 ◽  
Vol 326-328 ◽  
pp. 422-427 ◽  
Author(s):  
Priscila Anadão ◽  
Rafael Rezende Montes ◽  
Henrique Souza de Santis ◽  
Hélio Wiebeck
Keyword(s):  
Membrane Structure ◽  
Phase Inversion ◽  
Molar Mass ◽  
Polymer Concentration ◽  
Inversion Method ◽  
Asymmetric Membranes ◽  
Wet Phase Inversion ◽  
Microfiltration Membranes ◽  
Skin Formation ◽  
Phase Inversion Method

Asymmetric polysulfone membranes were prepared by wet-phase inversion method from casting solutions consisting of PSf/NMP and water as non-solvent. The effects of polymer concentration and molar mass were investigated by rheological studies. Moreover, membranes were characterized by scanning electron microscope (SEM). It was found that polymer solutions containing between 22 and 25 wt% PSf/NMP originated microfiltration membranes. The use of a higher mass molar polysulfone has been shown to reduce diameter pore and to maintain morphology. All the results were interrelated into a discussion of the skin formation of asymmetric membranes.

Synthesis and Characterization of Polysulfone/Montmorillonite (PSF/MMT) Mixed Matrix Membrane for Gas Separation

2014 ◽  
Vol 925 ◽  
pp. 18-22 ◽  
Author(s):  
P.C. Oh ◽  
N.A. Mansur
Keyword(s):  
Phase Inversion ◽  
Deionized Water ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Inversion Method ◽  
Mixed Matrix ◽  
Flat Sheet ◽  
Wet Phase Inversion ◽  
Phase Inversion Method

In this paper, flat sheet polysulfone (PSF) membrane and polysulfone/montmorillonite (PSF/MMT) mixed matrix membranes with different MMT contents were prepared by dry-wet phase inversion method.N-methyl-2-pyrrolidone (NMP) and deionized water were used as a solvent and coagulant, respectively. The morphology and structure of membranes were analyzed by scanning electron microscope. Thermogravimetric analysis was also performed to examine the thermal decomposition of the synthesized membrane. Results showed that MMT had a good dispersion in the PSF matrix.

scholarly journals Molecularly Imprinted Polymer Pearls Obtained by Phase Inversion for the Selective Recognition of Hypericin

2019 ◽  
Vol 56 (2) ◽  
pp. 315-320
Author(s):  
Ana-Mihaela(Florea) Gavrila ◽  
Tanta-Verona Iordache ◽  
Teodor Sandu ◽  
Anamaria Zaharia ◽  
Anita-Laura Radu ◽  
...  
Keyword(s):  
Molecularly Imprinted Polymers ◽  
Phase Inversion ◽  
High Performance ◽  
Extraction Procedure ◽  
Inversion Method ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Wet Phase Inversion ◽  
Uv Visible ◽  
Phase Inversion Method

A facile and inexpensive approach was established to prepare spherical molecularly imprinted polymers with hypericin (H-MIPs) via the wet-phase inversion method. The H-MIPs were characterized by infrared spectroscopy and thermogravimetric analysis. High-performance liquid chromatography combined with UV-Visible spectroscopy were used to assess the efficiency of the extraction procedure and, furthermore, to investigate the recognition properties of the H-MIPs. Obtaining an imprinting factor of 3.38 for hypericin strongly indicated a successful formation of molecularly imprinted cavities onto the H-MIPs. A fair selectivity towards hypericin was tested in comparison to the interfering molecule pseudohypericin.

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