Improving the adhesion and cohesion properties of polymer-based adhesives and sealants for high-temperature applications can be achieved through several approaches:1. Selection of high-temperature resistant polymers: Choose base polymers that have high thermal stability and can maintain their mechanical properties at elevated temperatures. Examples of such polymers include polyimides, polyetheretherketone PEEK , and polyphenylene sulfide PPS .2. Crosslinking: Introduce crosslinking agents or promote crosslinking reactions within the polymer matrix to enhance the thermal stability and mechanical strength of the adhesive or sealant. Crosslinking can be achieved through various methods, such as chemical crosslinking, radiation-induced crosslinking, or thermal crosslinking.3. Incorporation of fillers: Add thermally stable fillers, such as ceramic particles, carbon fibers, or glass fibers, to the polymer matrix to improve the thermal and mechanical properties of the adhesive or sealant. These fillers can also help to reduce the thermal expansion of the material, which can be beneficial in high-temperature applications.4. Use of additives: Incorporate additives, such as thermal stabilizers, antioxidants, and flame retardants, to improve the thermal stability and performance of the adhesive or sealant at elevated temperatures.5. Surface modification: Modify the surface of the substrates to be bonded or sealed to enhance the adhesion properties of the adhesive or sealant. This can be achieved through various methods, such as chemical etching, plasma treatment, or the application of adhesion promoters or primers.6. Curing process optimization: Optimize the curing process of the adhesive or sealant to ensure proper crosslinking and bonding at high temperatures. This may involve adjusting the curing temperature, time, or the use of catalysts to promote crosslinking reactions.7. Design of adhesive or sealant formulations: Develop custom formulations of adhesives or sealants that are specifically tailored for high-temperature applications. This may involve the selection of appropriate base polymers, fillers, additives, and crosslinking agents, as well as the optimization of the formulation's processing and curing conditions.By implementing these strategies, the adhesion and cohesion properties of polymer-based adhesives and sealants can be improved for use in high-temperature applications, ensuring reliable performance and durability in demanding environments.