Ultrastrong and Versatile Nonisocyanate Polyurethane Adhesive under Extreme Conditions

A Common Hydration Lubrication Based on Hydrophobically Modified Sulfobetaine Polyurethane and Synovial Components in the Application of Artificial Meniscus

“…A meniscus, located within the knee joint, plays an important role in the function of load transmission, stress distribution, and joint stabilization. − However, injury in the meniscus, one of the most prevalent and universal diseases of knee joints, , can cause functional failure of the meniscus and, in turn, lead to further knee injury. , Nowadays, for severe meniscus injury, meniscal resection has been performed clinically, but this method increases the stress of cartilage and accelerates the progression of osteoarthritis. , In view of the above situation, meniscus reconstruction is proposed, , with a particular focus on artificial meniscus . Due to low cost, low toxicity, and wide availability, − polyurethanes (PUs) are widely applied in resorbable artificial meniscus (Actifit) and substitutable artificial meniscus (Nusurface). , Of these, resorbable artificial meniscus is able to repair and regenerate injured meniscus, but there are clear performance gaps between regenerated meniscus and native meniscus . While substitutable artificial meniscus shows properties close to the native meniscus, it should be noted that the coefficient of friction (COF) of the substitutable artificial meniscus in synovial components is higher than that of the native meniscus, which could lead to the further deterioration of articular cartilage. , …”

Ultralow-Temperature-Tolerance Adhesive with Excellent Toughness and Record-High Strength

“…The adhesives used in Antarctica should have good bonding strength and toughness to withstand the impact of cold winds. For most adhesives used, represented by epoxy and acrylic resins, this is almost impossible because their extensive intermolecular interaction and rigid 3D network structure limits chain relaxation. ,,− Therefore, developing strong and durable adhesives that can perform well at extremely low temperatures such as −80 °C is one of the bottlenecks in the path of polar areas and outer space exploration.…”

“…With the in-depth exploration of extreme environments such as the Moon, Mars, Antarctica, Arctic, and high mountain areas, there is a great need for ultralow temperature resistant adhesives because insufficient sunlight can lead to long-term low temperature. − For example, the average winter temperature in Antarctica is −50 °C, and the coldest temperature is −89.2 °C . The adhesives used in Antarctica should have good bonding strength and toughness to withstand the impact of cold winds.…”