Abstract
A facile preparation for a series of porous poly(2,2,2-trifluoroethylmethacrylate–divinylbenzene) P(TFEMA–DVB) foams is discussed in this paper. The foams have adjustable morphology utilizing a suitable commercial surfactant, Hypermer B246, as stabilizer, and were compared with traditional organic surfactants or macromolecular block-polymers. Combining the porous properties and advantages of fluorine atoms, this type of fluoropolymer exhibited superb chemical stability and hydrophobicity performances with high porosity. These porous fluoro-monoliths preserved their regular porous structure without any degradation after immersion into strong acidic or basic solution for three days, hence demonstrating an excellent potential to deal with environmental pollution caused by oil spillages in severe environments. The tunable morphology (open and closed pores) and pore sizes were achieved by investigating various parameters like surfactant concentration, amount of external crosslinker, and aqueous phase volume. Droplet sizes of HIPEs were characterized using an optical microscope under different experimental conditions. The influence of pore structure and surface properties of polyHIPE on water contact angle and oil adsorption capacity was also explored. The results indicated that the porous material has an excellent oleophilicity and hydrophobicity, with water contact angles (WCA) up to 146.4°. Additionally, the results presented a noticeable adsorption with a very fast rate towards organic oils from either a water surface or bottom with adsorption saturation achieved in about 120 s. The prepared polyHIPEs showed a good recycling ability; even after 10 adsorption–centrifugation experiments, the adsorption capacity was still more than 85%.
Highlights
Rapid oil/water separation is a challenging task during remediation processes with oil leakage accidents which cause serious problems to marine life and ecosystems.[1]
The results indicated that the porous material has an excellent oleophilicity and hydrophobicity, with water contact angles (WCA) up to 146.4
HIPEs were prepared from frequently used conventional surfactants, such as cationic surfactant CTAB, anionic surfactant SDS, nonionic surfactant, Tween 80, Hypermer B246, Span 80, Span 85, and Span 60 with the same process
Summary
Rapid oil/water separation is a challenging task during remediation processes with oil leakage accidents which cause serious problems to marine life and ecosystems.[1]. As for various methodologies have been developed to prepare porous polymeric materials,[22] for example, molding or casting techniques, physical or chemical gas foaming methodologies, phase separation of block-polymers, and high internal phase emulsion methods. Practical use of this technique is hampered because of high temperature requirements, unavoidable use of organic solvents, and equipment for a foaming process is relatively expensive as it must be strong enough to withstand high applied pressure and temperature parameters Another major shortcoming of this technique is that pore connectivity and pore size adjustments of porous materials are not easy to achieve.[24] Block-polymers are composed of two immiscible polymer chains connected by covalent bonds. By using this kind of commercial surfactant, a series of uorinated porous materials were prepared with (2,2,2-tri uoroethyl methacrylate) (TFEMA) as a primary monomer, and divinylbenzene (DVB) as crosslinker This prepared porous uoropolymer demonstrated excellent hydrophobic and oleophilic properties along with speci c porous and interconnected structures to rapidly adsorb organic oil from water. The results showed that organic solvents were readily removed and reused a er a simple adsorption–centrifugation step, which showcased excellent recyclability performance of these uoropolymer monoliths
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