The effect of different wood fillers on the physicomechanical and rheological properties of wood–polymer composites was studied. It was shown that thermal and mechanochemical modification of wood flour has a considerable effect on the properties of wood–polymer composites.

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.

While producing polymers as well as during their processing, a certain amount of stabilizers is introduced into the product, which should ensure polymer properties saving during processing and those of polymer products during storage and operation. However, in cases where medical products based on polypropylene are subjected to radiation sterilization, there are not enough stabilizers in it to save their characteristics during operation. In this regard, we made an assessment of the influence of processing conditions on the properties of polypropylene with a different set of stabilizers in the manufacture of products based on it, in order to assess the degree of influence of each technological operation, including the effects of ionizing radiation during sterilization. Processing and radiation exposure are shown to affect the properties of polypropylene. Nevertheless, the effect of ionizing radiation with an absorbed dose of 40-60 kGy exceeds the negative effect of thermo-oxidative breakdown greatly during the extrusion of PP. Polypropylene containing organophosphorus stabilizers (brand PP 1562R) is more susceptible to breakdown. This is indicated by low values of oxidation induction time, breakdown initial temperature, as well as high values of MFI after exposure to electron radiation. PP brand PP H350FF/1 whose stabilizing complex contains phenol-phosphite antioxidants is more resistant to breakdown during processing and sterilization. For both brands under study, it is apparently necessary to increase the content of stabilizing additives in order to save the properties at the level of the original unexposed material.

Polylactic acid, due to such properties as biocompatibility, inertness to aggressive media of the human body and biodegradability is becoming more widespread in medicine, particularly in traumatology and reconstructive surgery. The article discusses modern developments in the field of biodegradable medical products based on polylactic acid that are already on the market or planned for production in the near future. Also considered the major major producers of polylactic acid.

The authors have shown the effective use of synthesized epoxidized rubber seed oil as a modifier of epoxy compound materials. It was stated that at the content of epoxidized rubber seed oil of 10 weight parts for 100 weight parts of epoxy resin ED-20, hardness and wear have been increased by 34 and 21% correspondingly, while the frictional coefficient was being reduced by a factor of 1.5. Wollastonite has been synthesized on the base of rice husk and limestone. By means of the X-ray diffraction method, it was proven that the specimen of synthesized calcium silicate with the molar ratio СаСО₃:SiO₂ = 1.2:1 is characterized by the structure closest to the naturally occurring wollastonite.

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.