Abstract
Phenol-urea-formaldehyde (PUF) thermosetting resin was synthesized by reacting methylol phenol with urea under acidic condition and its bonding strength was compared with commercial synthetic resins (PF resin, UF resin and PUF resin made by mechanical blending of PF and UF resins). The results indicated that PUF resin made by this process performed better bonding strength than commercial UF resin and mechanical blending of PF and UF resins in both dry and wet conditions. Its bonding strength was found to be intermediate to UF and PF resins.
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