Toughening modification method of epoxy resin

Epoxy resin (EP) is an important thermosetting resin formed by the reaction of EP oligomers with curing agents. According to the chemical structure and binding mode of EP groups, they are generally divided into five categories: glycerol amines, glycerol esters, glycerol ethers, aliphatic epoxides, and alicyclic epoxides.
Due to the presence of a large number of EP groups in pure EP, the chemical crosslinking density of the cured structure is high, the molecular chain flexibility is low, and the internal stress is high, resulting in high brittleness, poor impact resistance, and poor fatigue resistance of EP cured materials. This limits its application and development in high-tech fields that require high durability and reliability. Therefore, it is necessary to toughen and modify EP while maintaining its excellent performance.
Currently, there are three main methods in the industry to strengthen and modify EP.
(1) Adding rubber elastomer, core-shell polymer, thermoplastic resin (TP), thermotropic liquid crystal polymer (TLCP), and nanoparticles to the EP matrix to form microphase separation or homogeneous structure;
(2) Continuously penetrate TP into the three-dimensional cross-linked network of EP to form an interpenetrating network structure for toughening;
(3) By adjusting the microstructure of EP, such as introducing more flexible segments in the three-dimensional cross-linking network to improve its molecular flexibility, or introducing micro phase separation structures to enhance the deformation synergy of molecular segments and achieve toughening.

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