Today obtaining environmentally friendly wood composite materials is one of the main tasks. The urea-, phenol-, and melamine-formaldehyde resins used today are harmful to the human body and have a long-lasting effect. Therefore, replacing these and other resins with safe binders is one of the major problems.
Polymeric composites (PC) of tribological applications with a high level of physical, mechanical and thermal properties based on aromatic polyamide and silica gel have been developed. Regularities have been obtained that describe the effect of the filler content in PC on the friction coefficient, temperature on the friction surface and the intensity of linear wear rate of the studied PC-steel friction pair. It was found that the optimal silica gel content in the polymer matrix is 10 wt %.
In this work polymer nonlinear optical (NLO) materials in the form of thin films based on 3,7,3’,4’-tetrahydroxyflavone and diglycidyl ether of bisphenol A were obtained and investigated. It was found that the influence of the chromophore concentration on values of the macroscopic NLO susceptibilities (χ(2) of doped polymer films has extreme character. The maximum value of χ(2) is 6.11 pm/V at the concentration of dopant 20 wt %.
In the food industry and public catering establishments of Ukraine, a sufficiently large amount of oil is left, which was first used during the roasting and cooking of various food, such as vegetables and fish during canning, french fries, pancakes, pies and the like. At high temperatures during contact with the food and moisture contained in it, the processes of thermal decomposition, oxidation, polymerization and so on, the oil accumulates harmful to man substances such as aldehydes, acids, ketenes, polycyclic compounds, etc. In this case, the oil becomes unsuitable for further food use.
Low-melting glass has been synthesized in the system PbO-ZnO-B2O3 and Na2O-P2O5-MoO3 and its composition has been developed. The effect of the glass chemical composition on the softening temperature and the change of appearance during the heating have been established. Polypropylene-based composite with different content of glass powder as a filler was obtained. Thermophysical properties of the composites were determined. Introduction of glass powder to the polypropylene composition damaged the material structure homogeneity.
Hydrogels are one of the perspective classes of polymer systems that embrace numerous biomedical and pharmaceutical applications. Hydrogels have become very popular due to its unique properties such as high water content, softness, elasticity and biocompatibility. Natural and synthetic hydrophilic polymers can be physically or chemically crosslinked to obtain hydrogels. Their resemblance to living tissue opens up many possibilities for applications in biomedical fields.
The biodegradation of cellulose composite in different edaphic conditions is researched. The research is conducted on a sample of biodegradable composite material on the bases of polypropylene filled with cellulose. Досліджено біодеструкцію целюлозовмісного композиту в різних едафічних умовах. Дослідження здійснено на зразку біодеградабельного композитного матеріалу на основі поліпропілену, наповненого целюлозою.
New polymer composites on the basis of epoxy resin and different fine dispersed mineral powders (andesite, bentonite, diatomite, liquid glass and quartz sand) were obtained and their mechanical (ultimate strength), thermal (temperature dependence of the softening) and water absorption properties were investigated. It was established that all properties of these materials were essentially improved, when the same fillers modified by tetraetoxysilane (TEOS) were used.
The role of the structural peculiarities of electrical conducting polymer composites (ECPC) has been considered. Different conception on the nature of the conductivity, the mechanisms of charge transfer in heterogeneous structures are presented in this review. Experimental results obtained by different scientists are only partially in concordance with existing theoretical models.