Fast Evaporation Enabled Ultrathin Polymer Coatings on Nanoporous Substrates for Highly Permeable Membranes
Autor(en): | Shi, X. Wang, L. Yan, N. Wang, Z. Guo, L. Steinhart, M. Wang, Y. |
Stichwörter: | block copolymer; fast evaporation; membrane separation; selective swelling; ultrathin film | Erscheinungsdatum: | 2021 | Herausgeber: | Cell Press | Journal: | Innovation(China) | Volumen: | 2 | Ausgabe: | 1 | Zusammenfassung: | Thin polymer coatings covering on porous substrates are a common composite structure required in numerous applications, including membrane separation, and there is a strong need to push the coating thicknesses down to the nanometer scale to maximize the performances. However, producing such ultrathin polymer coatings in a facile and efficient way remains a big challenge. Here, uniform ultrathin polymer covering films (UPCFs) are realized by a facile and general approach based on rapid solvent evaporation. By fast evaporating dilute polymer solutions spread on the surface of porous substrates, we obtain ultrathin coatings (down to ∼30 nm) exclusively on the top surface of porous substrates, forming UPCFs with a block copolymer of polystyrene-block-poly(2-vinyl pyridine) at room temperature or a homopolymer of poly(vinyl alcohol) (PVA) at elevated temperatures. Upon selective swelling of the block copolymer and crosslinking of PVA, we obtain highly permeable membranes delivering ∼2–10 times higher permeance in ultrafiltration and pervaporation than state-of-the-art membranes with comparable selectivities. We have invented a very convenient but highly efficient process for the direct preparation of defective-free ultrathin coatings on porous substrates, which is extremely desired in different fields in addition to membrane separation. • Fast solvent evaporation is developed to produce UPCFs on porous substrates. • Selective swelling to cavitate block copolymers to form interconnected mesopores. • UPCFs enable the preparation of highly permeable membranes. © 2021 The Author(s) |
ISSN: | 26666758 | DOI: | 10.1016/j.xinn.2021.100088 | Externe URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85101165493&doi=10.1016%2fj.xinn.2021.100088&partnerID=40&md5=3cd8078617fef5b21a4551d0b7d4b209 |
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