عنوان مقاله [English]
Background and objectives: Wood plastic composite product are a new group of composite materials that in comparison with products such as particleboard and plywood not old and are placed in the group new products. This group of composite considering to their wide range, has provided the groundwork for researchers, nowadays. Since the a major part the combination of these composites to wood and lignocellulosic material was constitute and given that wood and lignocellulosic material are prone to decay, so This research with aim of evaluation the effect of nano clay and Maleic anhydride modified polypropylene maple coupling agent material on physical, mechanical and natural durability of composite from polypropylene/ Haloxylon wood flour against the Coriolus Versicolor were investigated.
Materials and methods: For this purpose Haloxylon wood flour with 50 percent weight ratio were mixed with polypropylene. Maleic anhydride modified polypropylene maple coupling agent material at two levels 0 and 3 percent and nano clay at four levels 0, 2, 4 and 6 percent used as variable factors. Material mixing process into the extruder device and test specimens were made using the method of injection molding. The test specimens placed for 14 week exposed to Coriolus Versicolor according to EN113 standard with 25 ºC temperature condition and 75 percent relative humidity. Finally the amount of mass loss, strength and modulus of bending, impact resistance, water absorption and thickness swelling of wood plastic composite in two state of before and after decay were determined. For morphological study of composite from X-ray diffraction was used.
Results: The results showed that with increasing nano clay mass loss, impact resistance, water absorption and thickness swelling were decreased but strength and modulus of bending of composites were increased. Beside with increasing the coupling agent, mechanical strength were increased but the mass loss, water absorption and thickness swelling were reduced. Structural studies of nano composites indicated that distribution of nano clay particles in matrix were Intercalation and with increasing the amount of nano clay up to 4 percent the spacing in nanolayered silicates were increased and with further increasing of nano clay particles up to 6 percent the distance between these layers were decreased.
Conclusion: the use of nanoclay and Maleic anhydride modified polypropylene maple coupling agent material the one hand resistance to decay and natural resistance of wood plastic composite against of the white rot Coriolus Versicolor will be a significant increase and on the other hand prevent from a significant reduction physical and mechanical properties of this composite by fungal attack.