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Which polymers are used to make thermosetting adhesives?
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adhesive
Overview of how glue and other adhesives work.
Thermosetting adhesives are characterized by their ability to form permanent, heat-resistant, and insoluble bonds through a curing process that creates a cross-linked network. Unlike thermoplastics, these materials cannot be softened or reshaped by heating once they have cured.1
The primary polymers used to make thermosetting adhesives include:
- Epoxies: Widely used for their high strength and excellent resistance to heat and solvents.23
- Phenol-formaldehyde resins: Frequently utilized in structural wood products, such as plywood, due to their strong bonding capabilities and moisture resistance.41
- Urea-formaldehyde: Another common thermosetting resin used in adhesive applications.1
- Polyurethanes: Known for their flexibility and resistance to shock and fatigue.21
- Unsaturated polyesters: Used in various thermosetting adhesive systems.1
Additionally, elastomer-based adhesives can function as thermosets if they undergo a cross-linking process during their application. These polymers are essential in demanding fields such as the aerospace industry where structural integrity under stress is required.1