Polyarylate Based Thin Film Composite (TFC) Membranes: Effects of Coating Parameters, Gutter Layer, and Intrinsic Material Properties

Chendake, Yogesh; Bhole, Yogesh; Lohokare, H. R.; Kharul, Ulhas K.

doi:10.1080/01496390903423089

Cited by 5 publications

(2 citation statements)

References 19 publications

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“…The literature describes several techniques for preparing thin‐film composite membranes. Among the methods employed in laboratory research, the Langmuir Blodgett technique, spin coating, and dip‐coating are preferred 8–14. All three methods are able to control the film thickness and are easy to operate and model.…”

Section: Introductionmentioning

confidence: 99%

Formation and characterization of perfluorocyclobutyl polymer thin films

Zhou

Jin

Haldeman

et al. 2013

J of Applied Polymer Sci

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Perfluorocyclobutyl (PFCB) polymers are a new class of materials that show promise as selective layer materials in the development of composite membranes for gas separations, such as carbon dioxide/methane (a pure gas ¼ 38.6) and oxygen/nitrogen (a pure gas ¼ 4.8) separations. In many of the flat sheet applications, a thin film of the selective layer that is free of major defects must be coated onto a support membrane. A focus of this study was to elucidate the impacts of solvents, polymer concentration, and dipcoating withdrawal speed on PFCB thin film thickness and uniformity. An extension was proposed to the Landau-Levich model to estimate the polymer film thickness. The results show that the extended model fits the thickness-withdrawal speed data well above about 55 mm/min, but, at lower withdrawal speeds, the data deviated from the model. This deviation could be explained by the phenomenon of polymer surface excess. Static surface excesses of polymer solutions were estimated by applying the Gibbs adsorption equation using measured surface tension data. Prepared films were characterized by ellipsometry. Refractive index was found to increase with decreasing film thickness below about 50 nm, indicating densification of ultrathin films prepared from PFCB solutions below the overlap concentration. Atomic force microscopy was used to characterize surface morphologies. Films prepared from tetrahydrofuran and chloroform yielded uniform nanolayers. However, films prepared using acetone as solvent yielded a partial dewetting pattern, which could be explained by a surface depletion layer of pure solvent between the bulk PFCB/acetone solution and the substrate.

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Section: Introductionmentioning

confidence: 99%

Formation and characterization of perfluorocyclobutyl polymer thin films

Zhou

Jin

Haldeman

et al. 2013

J of Applied Polymer Sci

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“…Generally, multilayer composite polymer membranes (MCPM), including a substrate, a gutter layer and a selective skin layer, are synthesized by deposition of a polymer solutions on a microporous substrate. This structure is necessary because the gutter layer reduces the substrate surface roughness and a thinner selective layer can be coated on a smooth surface . Recently, MCPM have received a great deal of attention in various gas separation industries .…”

Section: Introductionmentioning

confidence: 99%

Permeability and thermal properties of PDMS/LDPE multilayer composite membranes

Shahidi

Rodrigue

2018

J Polym Sci B Polym Phys

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This work reports on the preparation and properties of polydimethylsiloxane (PDMS)/low-density polyethylene (LDPE) multilayer composite polymer membranes (MCPM) for gas separation applications. The membranes were produced by combining sequential coating with melt-extrusion/salt leaching techniques. In particular, the gas sorption and permeation properties at different pressure (40-90 psig) and temperature (27-55 8C) are reported with morphology and thermogravimetric properties. The results show that a 20 lm PDMS layer was able to penetrate the microporous LDPE surface layer substrate leading to improved interfacial adhesion. Based on the different gases (CO 2 , CH 4 , and C 3 H 8 ) solubility, permeability, and diffusivity obtained, these membranes are seen as good candidates for industrial gas separations. FIGURE 7 Transport properties through the MCPM as a function of temperature for the different gas (CH 4 , CO 2 , and C 3 H 8 ): (a) solubility, (b) permeability, and (c) diffusivity.

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