Why do different resin systems (unsaturated polyester, epoxy, polyurethane) have widely varying compatibility with cores?

The key lies in “like dissolves like” – polarity, surface tension, and reactivity. Epoxy resin has a surface tension of about 47 mN/m, PET surface energy about 43 mN/m – good match for high wettability; unsaturated polyester resin has a surface tension of 38 mN/m, while XPS has 33 mN/m – poor wetting leads to “slippage” debonding. Additionally, polyurethane adhesive can undergo secondary reactions with isocyanate groups in PU foam, forming covalent bonds, which epoxy cannot. Engineering recommendations: PET/PVC cores pair with epoxy or polyurethane; PU core with polyurethane adhesive; XPS with low-exotherm modified epoxy or cyanoacrylate adhesive. Solvent-based adhesives must be avoided as solvents corrode most foam cores.

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Why do different resin systems (unsaturated polyester, epoxy, polyurethane) have widely varying compatibility with cores?

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