Abstract
The polyurethane prepolymer terminated with a double bond was synthesized using isophorone diisocyanate (IPDI), hydroxyl terminated polybutadiene (HTPB), 1,4-butanediol (BDO), and 2-hydroxyethyl acrylate (HEA). Then, a series of innovative UV-curable polyurethane coatings were prepared by blending ene-terminated polyurethane, fluoroacrylate monomer, and multifunctional thiol crosslinker upon UV exposure. The incorporation of fluoroacrylate monomer and multifunctional thiols into polyurethane coatings significantly enhanced the hydrophobic property, mechanical property, pencil hardness, and glossiness of the polyurethane coatings. This method of preparing UV crosslinkable, hydrophobic polyurethane coatings based on thiol-ene chemistry exhibited numerous advantages over other UV photocuring systems.
Highlights
Polyurethane (PU) is one of the most versatile polymers
The significance of this study lies in introducing a thiol-ene click crosslinking introducing a thiol-ene click crosslinking system for the fabrication of polyurethane coatings, which system for the fabrication of polyurethane coatings, which resulted in the advantages of high curing resulted in the advantages of high curing speed, low energy consumption, and improved yellowing speed, low energy consumption, and improved yellowing resistance
The photopolymerization process between a double bond and thiol is illustrated in Scheme 3; PETMP acted as an effective crosslinker to incite more EFCSA and polyurethane prepolymer to participate in polymerization
Summary
Polyurethane (PU) is one of the most versatile polymers. By changing the type and functionality of the polyol and isocyanate precursors, the properties of PU can be tailored, ranging from rigid solid to flexible elastomer [1,2,3]. The addition of fluorine and silica improved the mechanical property, flame retardancy, hydrophobicity, et al [32] They prepared a series of organosilicate hydrolyzable monomers combined with and oleophobicity of the coatings. A similar study was conducted by Mackey et al [32] They trimethylolpropane tris (3-mercaptopropionate) (tri-thiol) in a thiol-ene “click” polymerization prepared a series of organosilicate hydrolyzable monomers combined with trimethylolpropane tris reaction to produce clear, colorless thiol-ene networks using radiation and thermal-cure techniques. The significance of this study lies in introducing a thiol-ene click crosslinking introducing a thiol-ene click crosslinking system for the fabrication of polyurethane coatings, which system for the fabrication of polyurethane coatings, which resulted in the advantages of high curing resulted in the advantages of high curing speed, low energy consumption, and improved yellowing speed, low energy consumption, and improved yellowing resistance
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