| Autor: |
Xiansong Shi, Lei Wang, Nina Yan, Zhaogen Wang, Leiming Guo, Martin Steinhart, Yong Wang |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Předmět: |
|
| Zdroj: |
The Innovation, Vol 2, Iss 1, Pp 100088- (2021) |
| Druh dokumentu: |
article |
| ISSN: |
2666-6758 |
| DOI: |
10.1016/j.xinn.2021.100088 |
| Popis: |
Summary: 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. Public summary: • 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 |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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