Study of the processability of compositions based on sunflower husk and primary and secondary polypropylene and polyethylene
The authors of the articles studied the rheological properties of composite materials based on mixtures of primary and secondary polypropylene and polyethylene filled with biodegradable filler (sunflower husk). It was established that the viscosity of compositions based on mixtures of primary and secondary polyolefins does not change additively. At small oscillation frequencies (f = 0.01-10 Hertz), the viscosity of melts of polymer mixtures generally deviates to a larger direction from additive values; at the large values, the angular velocity (frequency of oscillation) is lower, which indicates the ease of processability of these compositions as compared with individual polymers. It was shown that the introduction of natural filler of plant origin in the polymer composition leads to a number of consequences. First, filled compositions are usually characterized by higher value of complex viscosity. Second, in all of the studied cases, the introduction of a filler into the composition led to the appearance of a flow anomaly, which indicated some complication of the processing process with the introduction of sunflower husk.