Developing superstrong adhesives that can be detached via an environmental friendly trigger under mild operation conditions is highly desirable in industry and it can significantly contribute to sustainability. This work provides a novel design of particular eutectogel adhesives based on poly(acrylic acid)-deep eutectic solvent (PAA-DES). The synthesized adhesives can bond strongly with versatile substrates and be readily detached via simple water soaking. The eutectogel adhesive establishes strong adhesion interactions with the surface of adherends through abundant hydrogen bonds and ion-substrate interactions, with an ultrastrong adhesion strength reaching as high as 12.50 MPa on the glass substrate. The adherends could be easily released by water soaking for several minutes with no damage to the system. Such a novel approach for developing detachable adhesives is believed to have high potential in commercialization that requires temporal joining and assembly processes, including optical lens drilling and wafer dicing.
Sustainable diblock copolymers of poly (isobornyl acrylate)- block -poly (methyl acrylate) (PIBOA- b -PMA) were rationally designed and synthesized with terpenoid-derived monomer IBOA as the rigid segment. These PIBOA- b -PMA diblock copolymers show excellent mechanical performance comparable to traditional triblock copolymer elastomers . They can be successfully utilized as strong sustainable adhesives with good adhesion performance and high adhesive strength . Moreover, stretchable liquid-free ionic conductive materials can be successfully fabricated by incorporating lithium bis(trifluoromethane sulfonyl) imide (LiTFSI) into PIBOA- b -PMA diblock copolymers without leakage or evaporation risks. Intriguingly, these ionic conductive materials show decreased tensile strength compared to that of pristine PIBOA- b -PMA diblock copolymer due to the plasticizing effect while still maintaining excellent extensibility. The resultant stretchable ionic conductive materials show accurate and dramatic resistance change in response to intermittent stretching-retraction deformations, finger joint bending/straightening curvatures, and elbow joint bending/straightening movements, demonstrating exceptional performance. This convenient and facile strategy can offer new opportunities for the development of novel bio-based diblock copolymers toward strong adhesives and stretchable ionic conductive materials.
The bonding strength of the bone–titanium (Ti) implant interface is critical for patients undergoing joint replacement. However, current bone adhesives used in clinic have shortcomings, such as biological inertness, cytotoxicity, and lack of osteogenic ability. In this study, a simple and low-cost hydrogel-based bone adhesive was prepared to improve the osseointegration ability and anti-infection ability of the bone–implant interface. A multifunctional hydrogel was prepared by incorporating nano-hydroxyapatite (HA) on polyethyleneimine (PEI) and polyacrylic acid (PAA) (PEI/PAA–HA). It was shown that PEI/PAA–HA hydrogel exhibited good self-healing and strong adhesive ability. The adhesive strengths of bone–Ti and Ti–Ti were measured as 2.30 ± 0.15 MPa and 1.07 ± 0.07 MPa, respectively. Vancomycin (VAN) was loaded into the PEI/PAA–HA hydrogel (PEI/PAA–HA-VAN) via a simple immersion method. The PEI/PAA-HA-VAN showed excellent antibacterial effect by sustained release of VAN. In addition, the PEI/PAA-HA-VAN hydrogel exhibited excellent cytocompatibility promoting the expression of osteogenic genes and the deposition of mineralized matrix. Collectively, this strong adhesive hydrogel showed great potential in enhancing bone-implant interface fixation.
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