Photo‐responsive cellulose nanocrystal modified fluorinated polyacrylate based on coumarin chemistry

Abstract

Photo‐responsive cellulose nanocrystal modified fluorinated polyacrylate was synthesized by environmentally friendly RAFT‐mediated Pickering emulsion polymerization using amphiphilic block copolymer modified cellulose nanocrystal poly(acrylic acid)‐g‐CNC‐g‐poly (hexafluorobutyl acrylate‐co‐7‐(2‐methacryloyloxyethoxy)‐4‐methylcoumarin) PAA‐g‐CNC‐g‐P (HFBA‐co‐CMA) (MCNC) as a stabilizer, and the photo‐responsive coumarin groups were introduced to endow it with self‐healing function. This paper mainly studied the effect of MCNC dosage on emulsion polymerization and latex film properties. The latex particle size and its distribution decreased as the MCNC dosage increased from 0.4 wt% to 1.0 wt%, and then increased afterwards. The mechanical property and thermal stability of latex films could be significantly improved by introducing MCNC. And the surface scratches of latex films with MCNC exceeding 0.4 wt% could be completely repaired after 7 h UV irradiation. Furthermore, the photo‐responsive cellulose nanocrystal modified fluorinated polyacrylate emulsion was applied to fabric finishing by dip‐rolling treatment. And the finished fabric had good hydrophobicity, oleophobicity and surface repair performance.

Biobased Composites from Eugenol- and Coumarin-Derived Methacrylic Latex and Hemp Nanocellulose: Cross-Linking via [2 + 2] Photocycloaddition and Barrier Properties

“…This reaction, known since the early 1900s, has in the last few decades been engineered in polymers to prepare light-responsive networks . Some works reported the photo-cross-linking of polymer latex particles exploiting coumarin functional groups, introduced by copolymerization or postpolymerization functionalization. , Self-healing photoresponsive cellulose nanocrystal-modified fluorinated polyacrylates containing coumarin derivatives were synthesized by Pickering emulsion polymerization. − In addition, a few examples of partially biobased photoresponsive polymer networks with coumarin functional groups have been reported. , However, to the best of our knowledge, coumarin-containing biobased polymer latexes photo-cross-linkable via [2 + 2] photocycloaddition have not been widely investigated so far.…”

Cellulose nanocrystals/fluorinated polyacrylate with mechanical tunability and self-healing capability via photo actuated reversible associations

“…In our previous study, a coumarin-based uorinated polyacrylate nanocomposite with self-healing has been fabricated by Pickering emulsion polymerization using cellulose nanocrystals (CNCs) as the stabilizer (Li et al, 2023;Zhou et al, 2023;Zhou et al, 2021). The in uences of the CNCs and 7-(2-Methacryloyloxyethoxy)-4-methylcoumarin dosages on the mechanical and self-healing of latex lm were investigated systematically (Zhou et al, 2023).…”

“…In our previous study, a coumarin-based uorinated polyacrylate nanocomposite with self-healing has been fabricated by Pickering emulsion polymerization using cellulose nanocrystals (CNCs) as the stabilizer (Li et al, 2023;Zhou et al, 2023;Zhou et al, 2021). The in uences of the CNCs and 7-(2-Methacryloyloxyethoxy)-4-methylcoumarin dosages on the mechanical and self-healing of latex lm were investigated systematically (Zhou et al, 2023). The present study, to optimize the composition of photo actuated self-healing uorinated polyacrylate networks based on coumarin groups and further reveal the effect of the 7-(4-vinylbenzyloxy)-4-methylcoumarin) (VBMC) dosage and mass ratio of BA and MMA on the mechanical and self-healing properties, a series of uorinated polyacrylate was synthesized by adopting the same polymerized method.…”