This research is devoted to the actual problem of the development of damping polymer materials which are effective in a wide range of temperatures and having satisfactory strength characteristics. There are many works devoted to the study of dynamic mechanical properties of filled composites, but most do not take into account the influence of plasticizer on the strength properties of the polymer, as they change its characteristics for the worse. In this respect, the study and comparison of the mechanical properties of the polymer base with the introduction of different types and concentrations of plasticizers is an urgent task. According to the received regularities it was possible to define the type, concentration and boundaries of the polarity of the plasticizer, which reduces the strength characteristics of ethylene-vinyl acetate to a lesser degree.

Данная работа посвящена проблеме разработки вибропоглощающих полимерных материалов, эффективных в широком температурно-частотном диапазоне. В связи с тем, что эффективность демпфирования колебаний в композите главным образом определяется свойствами полимерной матрицы, изучение ее свойств в зависимости от типа структурообразующих параметров является актуальной задачей. Цель статьи заключается в определении изменений динамических свойств этиленвинилацетата при добавлении в него наполнителей различного типа. Ведущим методом исследования данной проблемы является метод динамического механического анализа, позволяющий получить информацию об изменении динамических характеристик под действием динамической нагрузки и контролируемой температуры и частоты. С помощью выявленных закономерностей удалось определить тип наполнителя, существенно смещающего температуру стеклования пластифицированного этиленвинилацетата в сторону положительных температур. Выявлен тип наполнителя, при котором максимум механических потерь принимает наибольшие значения. Полученные зависимости могут быть использованы в качестве исходных данных для аналитического прогнозирования динамических механических свойств композитов, а также для разработки вибропоглощающих полимерных композиционных материалов на основе этиленвинилацетата, эффективных в широком диапазоне температур. Ключевые слова: этиленвинилацетат, слюда, тальк, технический углерод, динамические свойства, наполнительThis article is devoted to the actual problem of the development of damping polymer materials which are effective in a wide range of working capacity. Effectiveness of a vibration damping in a composite is mainly defined by properties of a polymeric matrix, that's why studying of its properties depending on type of gel-forming parameters is an urgent task. The purpose of this article is to determine the changes in the dynamic properties of the polymer ethylene-vinyl acetate with the addition of fillers in it various type. The leading method to investigate this problem is the method of dynamic mechanical analysis, which allows to obtain information about changes in dynamic characteristics under the influence of dynamic load and controlled temperature. According to the received regularities it was possible to define the filler type significantly displaces glass transition of plasticized ethylenevinyl acetate towards positive temperatures. The type of filler is established at which the maximum of mechanical losses assumes high values. The received dependences can be used as input data for analytical prediction of dynamic mechanical properties of composites, as well as for the development of damping polymer composite materials based on ethylene-vinyl acetate, effective in a wide temperature range.

This article is devoted to the problem of working out of damping polymer materials which are effective in the wide temperature and frequency range. In the modern world, work is being carried out to create damping polymer composite materials (DPM) from which it is possible to manufacture protective elements and parts of engineering structures of reduced vibration excitability. Existing DPM have a narrow temperature range, within which effective vibration absorption is observed, moreover, most of them go through a vulcanization stage, which increases the cost of the final product, has a harmful effect on environment and allows limited recycling of waste. One of the ways to solve this problem is to replace traditional rubber vibration-absorbing materials with thermo-elastoplasts (TEP). The most promising polymer for TEP is ethylene vinyl acetate (EVA), which has high damping properties, oil resistance and relative incombustibility. In this regard, experimental studies were conducted to establish the patterns of influence of the type and concentration of structure-forming components (plasticizers, fillers, modifiers) on the dynamic mechanical properties of TEP based on EVA in order to develop a new DPM effective in a wide temperature range. The leading method to investigate this problem is a method of dynamic mechanical analysis which allows to get information about changes of mechanical characteristics under mechanical load and controlled temperature and frequency. With the help of detected patterns it was possible to determine type of plasticizer which significantly decreases glass temperature of EVA. The percentage ratio of EVA/plasticizer system is stated, and the type of plasticizer at which the maximum of mechanical losses takes over greater values is accordingly detected. It is revealed, that to work out DPM on EVA basis, which are effective in wide temperature range it is more preferable to add not less than 40 % on volume basis inert fillers, such as talc or mica with addition of 5-10 % of carbon as the hardening additive. The kind of resin improving damping properties and raising rigidity of composites on EVA basis is defined. On the basis of the research, a material was developed which has the following properties: the maximum value of tan δ is at least 0.45 at a temperature of plus 5�C (oscillation frequency 10 Hz); width of the temperature interval within which tan δ is not less than 0.3 from minus 40 to plus 50�С (oscillation frequency 10 Hz); conditional tensile strength of not less than 10 kg/cm2, cold resistance up to minus 50�C.

The article deals with the problem of creating vibration damping polymeric materials with high damping properties in a wide temperature range. The purpose of the article is to study physical-mechanical properties of composites based on ethylene-vinyl acetate by adding various modifiers in the form of resins. The main method to investigate this problem is the method of dynamic mechanical analysis, which makes possible to obtain viscoelastic properties of polymeric materials under the influence of an oscillating load at various temperatures and oscillation frequencies. Due to the established experimental dependencies, the authors have determined the type of resin, which improves the damping properties and increases the stiffness of the composites based on ethylene-vinyl acetate. Moreover, the authors have defined the limit of working capacity of composites with resins at negative temperatures.