Abstract
Superhydrophobic coatings have drawn much attention in recent years for their widespread potential applications. However, there are challenges to find a simple and cost-effective approach to prepare superhydrophobic materials and coatings using natural polymer. Herein, we prepared a kraft lignin-based superhydrophobic powder via modifying kraft lignin through 1H, 1H, 2H, 2H-perfluorodecyl-triethoxysilane (PFDTES) substitution reaction, and constructed superhydrophobic coatings by direct spraying the suspended PFDTES-Lignin powder on different substrates, including glass, wood, metal and paper. The prepared lignin-based coatings have excellent repellency to water, with a water contact angle of 164.7°, as well as good friction resistance, acid resistance, alkali resistance, salt resistance properties and quite good self-cleaning performance. After 30 cycles of sand friction or being stayed in 2 mol/L HCl, 0.25 mol/L NaOH and 2 mol/L NaCl solution for 30 min, the coatings still retain super hydrophobic capability, with contact angles higher than 150°. The superhydrophobic performance of PFDTES-Lignin coatings is mainly attributed to the constructed high surface roughness and the low surface energy afforded by modified lignin. This lignin-based polymer coating is low-cost, scalable, and has huge potential application in different fields, providing a simple way for the value-added utilization of kraft lignin.
Highlights
With the development of science and technology, people’s consumption of energy, especially fossil based chemicals, is faster and faster, resulting in the scarcity of resources on the earth, so it is urgent to seek renewable energy sources
The superhydrophobic PFDTES-Lignin particles were obtained by fluorination modification of kraft lignin
The lignin-based superhydrophobic coating was prepared by spraying -PFDTESMolecules 2022, 27, x FOR PEER REVIEW
Summary
With the development of science and technology, people’s consumption of energy, especially fossil based chemicals, is faster and faster, resulting in the scarcity of resources on the earth, so it is urgent to seek renewable energy sources. Biomass has attracted social attention due to its renewable and abundant reserves [1,2]. The second most abundant biomass after cellulose and the only aromatic biopolymer in plants, has extensively been sought for producing numerous functional materials [3]. Liu et al successfully synthesized removable and strong bio-based polyurea adhesives via substituting polyetheramine partially with polyetheramine-grafted lignin, introducing a chain extender containing dynamic disulfide bonds. Moreno et al synthesized tough and transparent nanocomposites via Pickering emulsion polymerization using biocatalytic hybrid lignin nanoparticles [5]. Lignin has gradually been developed to an excellent candidate material for biomass modification and functionalization [6]
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