The effect of wood particles polyesterification with sorbitol and citric acid on the properties of particleboard produced with the use of PF/pMDI adhesive

This study investigated the efect of pine particle polyesterifcation with the mixture of sorbitol and citric acid (SCA) on the
properties of particleboard bonded with the PF/pMDI hybrid resin. The use of SCA with a concentration of 35% contributed
to improvement in the internal bond of the particleboards, their water resistance and dimensional stability. However, lowering
the concentration to 25% resulted in a deterioration of the properties of produced materials. The efect of diferent loadings
of pMDI in the PF/pMDI resin (0%, 5%, 15%, 25%) was also investigated and the outcomes showed a positive efect of the
share of 15% and 25%. Furthermore, boards made of treated particles were characterized by slightly better fammable properties (lower mass loss, fashing point temperature and delayed ignition), and the visibility of the efect increased with the
increase in the concentration of the impregnate. The results also indicate that the introduction of pMDI may also infuence
the ignition of the board