Next Article in Journal
Preparation of Layer-by-Layer Nanofiltration Membranes by Dynamic Deposition and Crosslinking
Next Article in Special Issue
Sorption Thermodynamics of CO2, H2O, and CH3OH in a Glassy Polyetherimide: A Molecular Perspective
Previous Article in Journal
From “Black Box” to a Real Description of Overall Mass Transport through Membrane and Boundary Layers
Previous Article in Special Issue
Experimental Mixed-Gas Permeability, Sorption and Diffusion of CO2-CH4 Mixtures in 6FDA-mPDA Polyimide Membrane: Unveiling the Effect of Competitive Sorption on Permeability Selectivity
Open AccessReview

Perfluoropolymer/Molecular Sieve Mixed-Matrix Membranes

1
Department of Environmental and Chemical Engineering, University of Calabria, Via P. Bucci 45 A, 87036 Rende, Italy
2
Physics Department, University of Calabria, Via P. Bucci 22 C, 87036 Rende, Italy
*
Author to whom correspondence should be addressed.
Membranes 2019, 9(2), 19; https://doi.org/10.3390/membranes9020019
Received: 30 December 2018 / Revised: 19 January 2019 / Accepted: 21 January 2019 / Published: 23 January 2019
(This article belongs to the Special Issue Gas Transport in Glassy Polymers)
Despite the outstanding chemical, thermal and transport properties of amorphous and glassy perfluorinated polymers, only few works exist on the preparation and transport properties of perfluoropolymer/molecular sieves mixed-matrix membranes (MMMs), probably because of their poor compatibility. In this review, the compatibilization of ceramic molecular sieves with perfluorinated matrices is considered first, examining the effect of the surface treatment on the gas transport properties of the filler. Then the preparation of the defect-free hybrid membranes and their gas separation capabilities are described. Finally, recent modelling of the gas transport properties of the perfluoropolymer MMMs is reviewed. The systematic use of molecular sieves of different size and shape, either permeable or impermeable, and the calculation of the bulk transport properties of the molecular sieves—i.e., the unrestricted diffusion and permeability—allow to understand the nature of the physical phenomena at work in the MMMs, that is the larger the perfluoropolymer fractional free volume at the interface, and restricted diffusion at the molecular sieves. This knowledge led to the formulation of a new four-phase approach for the modelling of gas transport. The four-phase approach was implemented in the frame of the Maxwell model and also for the finite element simulation. The four-phase approach is a convenient representation of the transport in MMMs when more than one single interfacial effect is present. View Full-Text
Keywords: glassy amorphous perfluoropolymers; mixed matrix membranes; zeolitic molecular sieves; gas separation; interfacial compatibilization; fractional free volume; restricted diffusion; barriers to mass transport; four phases Maxwell model; finite element modelling of transport glassy amorphous perfluoropolymers; mixed matrix membranes; zeolitic molecular sieves; gas separation; interfacial compatibilization; fractional free volume; restricted diffusion; barriers to mass transport; four phases Maxwell model; finite element modelling of transport
Show Figures

Figure 1

MDPI and ACS Style

Golemme, G.; Santaniello, A. Perfluoropolymer/Molecular Sieve Mixed-Matrix Membranes. Membranes 2019, 9, 19.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop