Influence of CTBN content on fracture toughness of PF particleboard

The study investigated whether the single-edge-notch bending method could be used in quantitative determinating the fracture toughness of the particleboard. Also, carbo xyl-terminated poly (butadiene-co-acrylonitrile) liquid rubber was chosen to improve the fracture toughness of the particleboard. Critical energy release rate GIC and critical stress intensity factor KIC were measured in different directions with sandwich structure and common specimens. The study shows that it is a feasible method to compare the fracture performance of different particleboard by the single-edge-notch bending. The liquid rubber can toughen the particleboard when the addition amount is less than 12% when PF resin was used. More addition can lead to dispersion problem which will decrease the ductibility of particleboard.