Investigation of hydrolytic degradation of polyhydroxyalkanoates and their mixtures with polylactides

The hydrolytic degradation of polyhydroxyalkanoates, polylactide and their mixtures in vitro in physiological solution and phosphate-salt buffer as well was researched. The hydrolysis intensity of biopolymers was evaluated via the mass loss, change in molecular weight as well as the water absorption applying the methods of infrared spectroscopy and complex thermal analysis. It was determined that films based on the researched biodegradable polymers thermostated in a phosphate-salt buffer have been degrading faster than in physiological solution.


The growing pace of Ukrainian polymer pipes market is significantly ahead of other markets for polymer products, which is being explained by the successful competition of their operational properties with pipes made of traditional materials - steel, cast iron, concrete.

Regarding this an important task during the production of water pressure pipes is the obtaining of technological raw materials based on polyethylene with the necessary technological capacity, which will solve the above problems.

Problems of the concept “mixture” interpretation and compatible terms in the educational literature

The problem of scientific accuracy of term “mixture” and corrersponding terms (“homogeneous mixture”, “heterogeneous mixture”, “homogeneous mixture”, “heterogeneous mixture”, “dispersed systems”) application in Ukrainian chemical literature for general education and higher education institutions is considered in the article.

The Role of Polyvinylpyrrolidone in the Formation of Nanocomposites Based on a Compatible Polycaproamide and Polypropylene

The interrelation of physico-mechanical and technological characteristics of newly created nanocomposites on the basis of polypropylene (PP)/polyamide (PA-6) mixture with PVP-modified montmorillonite has been investigated. The significant impact of modified polyamide on technological, physical and mechanical properties and heat resistance of polypropylene has been determined. It has been established that the melt flow index of the resulting composites increases by more than 2 times, compared with pure PP.

Investigation of structure of nanocomposites on the basis of mixture of polypropylene and modified polyamide with using scanning electronic microscopy.

Mixtures based on polypropylene (PP) and polyamide (PA) are of great importance as structural materials, the mixing of which reduces the negative characteristics of the original polymers. Non-polar PP significantly reduces water absorption of the material during mixing with polar high hydrophilic PA. As a result, the effect of moisture on the mechanical and thermal properties of the composites decreases. On the other hand, mixing PP with PA can extend the temperature range of material exploitation at negative temperatures.

Forming of crude oil mixtures with increased yield of target fractions

Researches results of 5 samples of crude oil have been analyzed and generalized. The relationship between component, structural-group composition and physico-chemical properties have been determined to classify crude oil reliably and rapidly. Compounding and sequence of crude oil mixture forming have been developed to provide the maximum yield of target fractions. These principles are based on combination of simulation method, cluster and statistic analyses. The expediency of the proposed forming method has been confirmed experimentally.

Regularities of Films Forming on the Basis of Polyamide-Polyvinylpyrrolidone Mixtures

Modification of polyamide-6 by polyvinylpyrrolidone with molecular mass of 12000±2000 has been carried out using their mixing in formic acid solution followed by solvent evaporation. The possibility of films permolecular structure control, physico-mechnical and thermophysical properties by treatment conditions after their formation has been established.