THE METHOD OF CALCULATING EFFECTIVE RESILIENT PROPERTIES OF ORIENTED POLYMERS

Author:

Synyuk Oleh, Khmelnytskiy National University, Khmelnytskiy, Ukraine

Language: ukrainian

Annotation:

Urgency of the researchNowadays the problem of polymer materials recycling is relevant not only from the standpoint of environmental protection, but also due to the fact of the plastic waste shortage, polymers are becoming powerful energy source.

Target settingDuring the plastic waste processing, in the first stage they should be subjected to drawing that provides a transition from undirected polymers state to crystalline oriented one. This will lead to change in the elastic properties of polymers that can be associated with the major deformation of ultimate levels of polymer supramolecular structure.

Actual scientific researches and issues analysisAs a result of the structural analysis conducted by various physical methods, we found that in the undirected state of spherulite polymer structure there are two basic levels of supramolecular polymer structures – spherulites with heterogeneous crystal structure of amorphous and ones, having a homogeneous disordered structure.

Uninvestigated parts of general matters definingMechanical models, existing today, do not include structural features of the supramolecular structure of polymers, the relationship between amorphous and crystalline components, do not allow quantitatively observe the structural changes occurring during deformation of the polymer.

The research objectiveDevelopment of a method for calculating the effective elastic properties of polymers with oriented structure. The method is based on the construction the structural theory of drawing partially crystalline polymers which is based on the hypothesis of existence of a quantitative relation between drawing parameters, characteristics of the supermolecular structure and indices of the mechanical properties of the main structural levels forming at certain drawing stages.

The statement of basic materialsThe process of oriented drawing is shown to be simulated as a uniform compression/tension with the transformation coefficient equaling the draw ratio. The proposed approach gave rise to a theory of homogeneous structural stresses and effective module for the spherulite supermolecular structure. The equations were obtained which allowed to predict the structural stresses and elastic characteristics of oriented partially crystalline polymers of the spherulite structure. The theory allows to describe the influence of drawing on the elastic properties of a wide range of partially crystalline polymers.

Conclusions

Dependencies, obtained in the article, can determine the degree of drawing, by which begins the fracture of spherulite structure. That has allowed to develop a method for determining the degree of boundary drawing, in which spherulite structure turns into fibrous. This technique can be used in the design of equipment for plastic waste processing.

Key words:

waste, polymer destruction, spherulite, drawing, fibril

References:

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