PET foam surfaces contain polar ester groups that can form hydrogen or covalent bonds with hydroxyl and amine groups in epoxy resin, achieving interfacial bond strength of 4–5 MPa. In contrast, PU foam surfaces are mostly non-polar polyurethane soft segments, often containing mold release agents (silicone oil or wax), leading to poor wetting by epoxy adhesives. In actual pull-off tests, failure at the PU/epoxy interface often occurs within the top 0.5mm of the core (cohesive failure), while the PET/epoxy interface can achieve mixed failure with the face/adhesive interface. If bonding PU is necessary, plasma treatment or application of a polyurethane primer is recommended to improve compatibility.
Why is the chemical compatibility of PET foam with epoxy adhesives better than that of PU foam?
- XPS Foam Core
- PET Foam Core
- PVC Foam Core
- PU Foam Core
- PMI Foam Core
- PP Honeycomb Core
- Balsa Wood
- XPS Backer Board
- FRP XPS Sandwich Panel
- FRP PET Sandwich Panel
- FRP PVC Sandwich Panel
- FRP PP Honeycomb Panel
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