はじめに

In a variety of applications, such as adhesives, coatings, and composites, maleic anhydride coupling agents are essential for increasing interfacial bonding. To improve these coupling agents’ efficacy and create novel materials with improved interfacial characteristics, it is crucial to comprehend how they work.

1. Overview of Maleic Anhydride Coupling Agents

Due to their capacity to improve the adhesion of diverse materials, maleic anhydride coupling agents are frequently utilized in industries. These substances have functional groups called maleic anhydrides that may react with a wide range of substrates, including polymers, metals, and inorganic compounds. Covalent bonds are created between the substrate and the adhesive or coating by the coupling agents, acting as intermediaries and enhancing interfacial bonding.

2. Interfacial Bonding-Related Chemical Reactions

Maleic anhydride coupling agents work through a variety of chemical processes. First, maleic acid is created when the maleic anhydride groups hydrolyze in the presence of moisture. The hydroxyl groups on the substrate surface can then react with this maleic acid to produce ester linkages. These ester bonds provide the substrate and the glue or coating a solid and long-lasting connection.

3. Development of Covalent Bonds

Covalent bonds between the substrate and the adhesive or coating can also be formed more easily thanks to maleic anhydride coupling agents. The amine or alcohol functional groups in the adhesive or coating can react with the maleic anhydride groups to generate imide or ester connections, respectively. The strength and stability of the interfacial connection are greatly increased by these covalent interactions.

4. Improved Moistening and Spreading

Maleic anhydride coupling agents improve wetting and spreading on the substrate surface in addition to creating covalent connections. The surface functional groups of the substrate can react with the maleic anhydride groups to decrease the contact angle and enhance the wetting characteristics. Better interfacial bonding results from the adhesive or coating spreading more uniformly as a result of the enhanced wetting.

5. Interfacial Delamination Prevention

Maleic anhydride coupling substances are also very important for avoiding interfacial delamination. Covalent bonds that are created between the substrate and the adhesive or coating serve as a barrier to stop fractures or delamination from spreading at the interface. The material’s overall mechanical characteristics and durability are improved by the increased interfacial bonding strength.

Maleic anhydride coupling agents encourage interfacial bonding via a variety of methods, including chemical processes, the production of covalent bonds, improved wetting, and the avoidance of interfacial delamination. These coupling agents are necessary to increase the durability and performance of materials in a variety of applications. It is possible to improve the performance of maleic anhydride coupling agents and create novel materials with improved interfacial characteristics by knowing how they work.