Moisture-Accelerated Curing Kinetics of 1C-PUR Adhesives in Green Eucalyptus globulus L. Veneer Joints

High moisture content in unseasoned green wood significantly influences bonding kinetics in moisture-curing systems. This study investigated the in situ viscoelastic 1. C-PUR viscoelastic curing kinetics without compromising ultimate stability. A Two-Way ANOVA confirmed a dominant main effect of moisture condition on the 50% consolidation milestone (t50%, p < 0.001, partial ηp2 = 0.954). Specifically, green moisture reduced t50% from 62.8 ± 4.4 min to 24.0 ± 0.8 min for Adhesive A (61.8% acceleration) and from 89.4 ± 2.3 min to 56.3 ± 8.3 min for Adhesive B (37.1% acceleration). No statistically significant difference occurred for the 120 min storage modulus baseline (E′120 > 6000 MPa, p = 0.166), demonstrating that interfacial free water acts as a stoichiometric promoter rather than a defect, overriding cell-wall plasticization. While these findings validate early viscoelastic screening feasibility for green gluing high-density hardwoods, complete structural joint qualification requires subsequent standardized macro-mechanical shear and durability testing.