Epoxy resins are organic polymer compounds containing two or more epoxy groups and the epoxy groups can be located at the end or middle of the molecular chain or in a ring structure. Due to the presence of these epoxy groups, the epoxy can be cured and cross-linked with various types of curing agents and can form insoluble, non-melting polymers with a three-dimensional network structure. Epoxy resins are a type of thermosetting resin with numerous applications; in addition to their use as adhesives, epoxy resins can also be used as coatings, melting plastics, casting plastics and fiber-reinforced resin matrix composite materials and are widely used in the mechanical, electronic, chemical, aerospace, automotive and construction sectors.
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