Membrane Modification by CVD Polymers

Yang, Rong

doi:10.1002/9783527690275.ch13

Cited by 1 publication

(1 citation statement)

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“…Initiated chemical vapor deposition (iCVD) has emerged as an alternate approach for the hydrophilic modification of membranes. − Unlike the solution-based modification process during which liquid surface tension issues can result in uneven and thick coatings, ,, the solventless process of iCVD formed uniform and conformal coatings with submicrometer thickness, ,− thus enabling the preservation of membrane pore openings. Furthermore, the one-step process and the established scale-up of iCVD present the advantage to prepare oil–water separation meshes at a large scale. Metal meshes modified with iCVD hydrophilic polymers have been successfully used in gravity-driven oil–water separation and demonstrated enhanced fouling resistance and water flux .…”

Section: Introductionmentioning

confidence: 99%

Solventless Polymer-Grafted Mesh for Rapid and Efficient Oil–Water Separation

Huang

Zhu

Mao

2023

ACS Appl. Polym. Mater.

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We report a solventless bilayer strategy for grafting hydrophilic poly(methacrylic acid) (PMAA) onto metal meshes. The bilayer nanocoating consisted of ultrathin PMAA brushes grafted onto a highly crosslinked primer that binds to each mesh wire. The enrichment of hydrophilic functionalities on the PMAA-grafted mesh surface improved the surface hydration and underwater oil repellency over the PMAA-crosslinked mesh, which contributed to the formation and stabilization of continuous water films between mesh wires to reject oil penetration in repeated uses. The vapor-based nanocoating process maximized the retention of pore openings for high-flux oil–water separation. The retained permeability, together with the enhanced oil repellency, enabled the PMAA-grafted mesh to achieve excellent gravity-driven oil–water separation, with an oil rejection rate higher than 99%, water flux exceeding 50,000 L m–2 h–1, and flux decay less than 3% after 20 cycles of reuse. More importantly, the PMAA-grafted mesh preserved high separation efficiency and flux stability under conditions of high salinity and extreme pH.

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