A Green Catechol-Containing Cellulose Nanofibrils-Cross-Linked Adhesive

Abstract

Traditional adhesives with strong adhesion are widely applied in the fields of wood, building, and electronics. However, the synthesis and usage of commercial adhesives are not eco-friendly, which are harmful to human health and to the environment. In this study, a green cellulose nanofibrils/poly­(hydroxyethyl methacrylate-co-dopamine methacrylamide) (CNFs/P­(HEMA-co-DMA)) adhesive with excellent biocompatibility and strong bonding strength has been fabricated. P­(HEMA-co-DMA) with a catechol content of 7.1 mol % was synthesized using dopamine methacrylamide and hydroxyethyl methacrylate. The CNFs/P­(HEMA-co-DMA) adhesive was generated by cross-linking P­(HEMA-co-DMA) solution using cellulose nanofibrils (CNFs). Strong adhesion was realized on various substrates, with a maximum lap shear strength of 5.50 MPa on steel. The NIH 3T3 cells test demonstrated that the adhesive possessed excellent biocompatibility. The green catechol-containing CNFs-cross-linked adhesive has promising potential for applications in medicine, electronic, food packaging, and engineering.

Development of Biocompatible Mussel-Inspired Cellulose-Based Underwater Adhesives

“…In nature, different marine organisms, including mussels, − sandcastle worms, − and barnacles, , direct a strong wet adhesion mechanism via the elegant combination of catechol chemistry, polyelectrolyte complexes, and supramolecular architectures. − This is due to the excellent wet adhesion tenacity that can be mimicked or competed with by the use of 3, 4-dihydroxy- l -phenylalanine (DOPA) groups. , The catechol acts as a crucial functional group on various substrates through catechol chemistry, including hydrogen bonding, π–π interactions, metal coordination, Schiff base reaction or Michael addition, cation–π interactions, hydrophobic interactions, boronate–catechol complexation, and covalent bonds. Based on their understanding of adhesion mechanisms, researchers have also gradually developed a variety of adhesive materials for potential applications, such as bioelectronics and biomedicines. − …”

Ultra-Tough Vanillin-Based Polyester Hot-Melt Adhesive through Multiple Oxygenated Groups

“…Adhesives serve a crucial part in human life and are extensively utilized in the industrial bonding, packaging, building manufacturing, electronic device, and aerospace industries. − However, at present, adhesives still face challenges such as poor bond strength (such as epoxy resins), − toxicity, irreversible curing (such as acrylics, polyurethanes, and organic silicones), , and limited conditions of use (such as anaerobic adhesives, UV adhesives, and solvent-based adhesives). − Polyester hot-melt adhesives are a typical example of solvent-free, ecologically friendly adhesives that meet the demands of the adhesive industry for energy efficiency, nontoxicity, low cost, reusability, and excellent performance. , Linear saturated polyesters are generally utilized as hot-melt adhesives, prepared by transesterification, esterification, and polycondensation reactions, which is simple and easy to process. − However, these raw materials used in commercial hot-melt adhesives are usually derived from petroleum resources and do not meet the requirements of sustainable development. − Yet, compared to petrochemical products, which come in a large variety, the number of biobased monomers that can be employed to create biomass polyester hot-melt adhesives is substantially fewer. − For example, Zheng et al used biobased 1,5-pentanediol as a replacement for petroleum-derived 1,6-hexanediol for polyester hot-melt adhesives . Kim et al prepared a polyester hot-melt adhesive using polybutylene terephthalate modified with dimer acid methyl ester derived from fatty acid methyl esters .…”

Dynamic reversible adhesives based on crosslinking network via Schiff base and Michael addition

“…Modern functional adhesives oen face more complex application environments, which means that adhesives need increasingly complex properties and oen require multiple functions. [1][2][3][4][5] Numerous researchers have developed and prepared adhesives with underwater adhesion, [6][7][8][9][10][11] multiple substrate adhesion, [12][13][14][15][16] stretchability, 17,18 self-healing, 19 biosustainability, [20][21][22] moldability, 23 etc. However, this not only requires a more complex structure of the polymer but also means that the conditions and steps required for synthesis become more cumbersome.…”