Abstract
Polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) and polyvinylidene fluoride (PVDF) blend membranes, with interconnected channels decorated with polymer crystallites, were produced by a tw...
Highlights
Fluorinated polymers represent the most investigated class of hydrophobic polymers for membrane preparation by solution casting for membrane contactor applications
We demonstrated that highly hydrophobic membranes can be prepared by blending two fluorinated polymers, i.e., polyvinylidene fluoride (PVDF) homopolymer and its copolymer PVDFHFP, by a two-step sustainable casting method previously developed for PVDF membranes.[26]
The immiscibility of PVDF-HFP and PVDF was first assessed under general thermodynamic framework, using eqs 7 and 12
Summary
Fluorinated polymers represent the most investigated class of hydrophobic polymers for membrane preparation by solution casting for membrane contactor applications. The application of the vapor-induced phase separation (VIPS) methodology allows for a better control of the membrane properties in terms of hydrophobicity, roughness, and pore size. In these articles, toxic solvents, like N-methyl2-pyrrolidone (NMP),[27,28] tetrahydrofuran (THF), and N,Ndimethylformamide (DMF),[27] and pore forming additives[28] were used to prepare the casting solutions. It has been reported,[38] that polymer pairs tend to be immiscible if χ1,2 ≥ χcr and phase separation occurs, instead if χ1,2 ≤ χcr, the polymers are miscible and no phase separation occurs
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