Dynamic rheological properties of bamboo flour/high density polyethylene (HDPE) composite

In order to explore dynamic rheological behavior of wood plastic composites, and to better improve the production efficiency and reveal interfacial interaction mechanism, the bamboo flour/high density polyethylene(HDPE) composite was selected to investigate the effects of aluminum-titanium coupling agent, and calcium stearate lubricant on the rheological behavior of composite. The composite was firstly compounded by internal mixer, and then made through injection molding. A series of dynamic rheological tests were conducted, which include the strain sweep, frequency sweep and strain sweep at different temperatures. Strain scanning results showed that addition of additives in bamboo flour/HDPE composites enlarged the stain range of the linear visco-elastic zone compared with the composites without additives. The correlation between the modulus and the slope of the frequency at the low frequency region indicated that adding coupling agents and lubricants could accelerate the dispersion of bamboo floor into polyethylene matrix. The relationship between dynamic viscosity and loss viscosity revealed that the interfacial adhesion between the bamboo powder and polyethylene could be enhanced, to a certain extent, by adding coupling agents and lubricants. The research can provide a reference for application of additives agent during wood plastic composites processing.