Supramolecular Polymeric Pressure-Sensitive Adhesive That Can Be Directly Operated at Low Temperatures

Abstract

Low-temperature adhesion is ubiquitous in daily life and industry. However, most supramolecular adhesives are thermoplastic materials that require heating during the adhesion. Herein, a supramolecular approach is used to construct unique pressure-sensitive adhesives (PSAs) that can be directly operated at low temperatures (−60 °C). Supramolecular polymerization between phytic acid (PA) and water (H) endows poly(PA-H)s with excellent mechanical properties and low temperature adhesion capacity. Poly(PA-H)s can easily be processed into PSA tapes, pastes, and particles. Poly(PA-H)s were directly adhered to various surfaces by pressing at low temperatures (0 to −60 °C). No heating or high-temperature-induced solid−liquid transition was required for the low-temperature adhesion of poly(PA-H)s. With the help of structural water units in supramolecular polymers, poly(PA-H)s showed strong, stable, and organic solvent resistant adhesion performances at low temperatures, with adhesion strength of up to 3.61 MPa at −60 °C.

Bio-based Pressure Sensitive Adhesives Derived from Cardanol, Vanillin, and Sebacic Acid for Removable Nonstructural Applications

“…Processability of PSA is very important for real time applications to cast on plastics or metal substrate with appropriate thickness. Figure (a,b) shows easy extrusion of the optimized sample out of syringe through injection, revealing the experimental evidence of applicability as PSA . Similarly, panels (c) and (d) demonstrate the tackiness of the PSA with good adhesion.…”

“…Therefore, the peak at 1510 cm –1 could have aroused from the C–C vibrations of the benzene ring in VE . Reports also show that the band might be correlated with the in-plane bending vibrations arising from C–O bonds and −CH 3 groups, which can also be associated with vanillin . Likewise, the weak band at 1237 cm –1 might be a consequence of the aromatic C–H in-plane vibrational deformations resulting from vanillin addition (Figure b).…”

“…Figure 8(a,b) shows easy extrusion of the optimized sample out of syringe through injection, revealing the experimental evidence of applicability as PSA. 40 Similarly, panels (c) and (d) demonstrate the tackiness of the PSA with good adhesion.…”

“…18 Reports also show that the band might be correlated with the in-plane bending vibrations arising from C−O bonds and −CH 3 groups, which can also be associated with vanillin. 40 Likewise, the weak band at 1237 cm −1 might be a consequence of the aromatic C−H in-plane vibrational deformations resulting from vanillin addition 40 (Figure 5b). Therefore, the formation of copolyesters and the linkages of VE with the base PSA can be essentially concluded from the IR spectroscopy.…”

“…Badia et al developed waterborne PSA formulations with 72% of biocontent through emulsion polymerization of commercial biobased monomers octyl acrylate and isosorbide methacrylate and achieved much higher peel strength (8.9 N/25 mm) and tackiness of 8.3 N . Our group has also previously developed UV curable PSAs derived from cardanol-based PU acrylates and lignin acrylates with acrylated linseed oil as a tackifier with ∼50% biomass content, and the peel strength was comparable to commercial tapes and plant-oil-based adhesives. ,− However, higher biomass content based PSA formulations usually involved petro-sourced monomers during polymerization to enhance the adhesion and peel for real time applications. − …”