Abstract. The elastic modulus and yield stress for polypropylene-based wood-plastic composites are studied as dependent on the type and dosage of wood flour, the type of nanofillers and the method of their incorporation. The effect of nanofillers on the WPC structure is also investigated. It is demonstrated that optical and scanning electron microscopy allows one to make a morphological analysis of the WPC structure.

Abstract. In recent decades short fiber reinforced composites have found a widespread application in automotive industry, where the use of petrochemical plastics is more common. The recent development of bio-based plastics offers the opportunity to replace petroleum-based plastics. Owing to this statement, the ability of reinforcing bio-based polyamide 10.10 (PA 1010) by short fibers has been investigated. Traditional fillers, like glass and carbon fibers, have been generally used to achieve high mechanical properties for lightweight structures. A possible combination with manmade cellulose fibers can be an alternative to increase bio-based content in the composite and to save appropriate mechanical properties. Twin screw extrusion and injection molding have been performed to produce granules and test specimens, respectively. Characterization of mechanical properties, such as impact strength, tensile strength and tensile elongation, has been provided. Fiber breakage in glass fiber reinforced composites during the twin screw extrusion process is estimated.

Influence of lubricants such as montan waxes and fatty acid esters, on properties of glass fiber reinforced composites based on polyamide 1010. Composites with 40 % wt. glass fibers were obtained on twin-screw extruder, while the fiber breakage occur. Fiber length distribution were measured. It is shown, that adding of 0.5 % wt. of lubricants increase content of glass fibers longer than 2 critical length and improve mechanical properties.

This paper describes the study on the influence of glass spheres on physicochemical and service properties of wood-polymer composites (WPC) based on polypropylene. The main objective of doping WPC with glass spheres was to reduce density of composites maintaining their service properties.

The results of a study of mixing compositions based on polypropylene and vegetable fillers modified with an enzyme preparation are presented. During the experiment, the optimal modification time and the ratio of the volume of water to the mass of the vegetable filler during modification were determined. Physical and mechanical tests revealed that the composites with the modification were superior to the basic composites without the modification.