A fluoride degradable crosslinker for debond-on-demand polyurethane based crosslinked adhesives

Polyurethane Detachable Lamination Adhesives Containing Alkaline Degradable Aromatic Chain Extender

“…Many studies have used fluoride ions, − light, − and peroxides as stimuli to trigger side chain deprotection and followed by backbone degradation spontaneously. In particular, Babra et al , synthesized a fluoride degradable cross-linker for debond-on-demand PU adhesives with a silyl protected phenol structure which undergo quinone-methide elimination in the main chain when the silyl-protecting group leaves after contact with fluoride ions solution.…”

“…Many stimulus conditions contributing to adhesive debonding have been studied, including optical, − thermal, − magnetic, electrical, chemical, − etc. Light can induce polymer degradation, isomerization, , or overcuring, heat can induce decomposition, , expansion, rearrangement, , and phase separation to achieve debonding.…”

Design of Debondable PU Coating for Degradation on Demand

“…An analogue tert-butyl dimethylsilyl protected tri-benzyl alcohol was incorporated as a crosslinker in PU. Upon exposure to TBAF, loss in adhesion strength was observed [19,20]. However, upon degradation, the PU did not dissolve and therefore cannot be removed from the substrate.…”

Grafting self-immolative poly(benzyl ether)s toward sustainable adhesive thermosets with reversible bonding and triggered de-bonding capabilities

“…In terms of molecular design, a variety of polymeric structures embedded with independent functional moieties that can be orthogonally activated to achieve the desired properties have been proposed. Recent studies have employed dynamic bond exchange, [7][8][9][10][11][12][13][14][15][16] isomerization, [17][18][19] or elimination 15,20,21 for the covalent control of adhesive performance, while non-covalent interactions such as multiple hydrogen bonds or metal coordination have also been used. 6,[22][23][24][25] However, in most cases, the covalent and noncovalent bonds individually function for adhesive properties so it is difficult to achieve rapid and comprehensive control for them; thus, persistent and/or excessive stimulation is oen required, which weakens the energy-efficient re-bonding and/or de-bonding behavior of the adhesive.…”