Physicomechanical Properties of One-Dimensional Periodic Structures by Transmission of Laser-Excited Wide-Band Acoustic Pulses

The strength-deformation characteristics of a low-density polyethylene filled with cellulose-containing products, such as microcrystalline cellulose Thermocell, pinewood grinding dust and sawdust, and technical Thermocell obtained by a thermocatalytic method from pinewood raw materials are studied. The effect of the type of the filler and its content in the composite on the tensile strength, relative elongation, and work of failure in tension is determined. The water sorption and change in the strength-deformation characteristics of the composites during water sorption and desorption are also studied. It is found that the thermocatalytic treatment of cellulose-containing fillers makes it possible to increase the tensile strength of composites and to decrease the strength drop caused by water sorption.