Influence of Conditions for Obtaining Polylactide-Based Materials on Their Physico-Mechanical and Rheological Characteristics

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Resumo

The work is devoted to the study of the influence of the conditions for obtaining materials based on the synthetic polymer polylactide on their physico-mechanical and rheological characteristics. These materials are promising for the creation of biodegradable polymer implants of temporary action to maintain the mechanical properties of broken bones during the healing period. They are designed to replace the titanium fixators currently used for these purposes, which is due not only to the need for repeated surgery to extract them, but also to the fact that the strength and modulus of elasticity of titanium fixators exceed the values of bone strength indicators by an order of magnitude, which can cause the phenomenon of bone resorption and a decrease in its strength. It has been established that with an increase in temperature in the plasticization and pressing zone, as well as with an increase in pressure in the press, there is a natural decrease in the viscosity of the polylactide melt, as well as the values of the elastic modulus and breaking stress of solid samples. Varying the cooling rate of the material during the pressing process affects the degree of its crystallinity. At the same time, the lower the cooling rate, the greater the degree of crystallinity of the polylactide and the greater the values of the elastic modulus and breaking stress.

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Sobre autores

E. Bakirova

Ufa University of Science and Technology

Autor responsável pela correspondência
Email: elina_bakirova@mail.ru
Rússia, Ufa

R. Lazdin

Ufa University of Science and Technology

Email: elina_bakirova@mail.ru
Rússia, Ufa

A. Shurshina

Ufa University of Science and Technology

Email: elina_bakirova@mail.ru
Rússia, Ufa

V. Chernova

Ufa University of Science and Technology

Email: elina_bakirova@mail.ru
Rússia, Ufa

E. Zakharova

Ufa University of Science and Technology

Email: elina_bakirova@mail.ru
Rússia, Ufa

E. Kulish

Ufa University of Science and Technology

Email: elina_bakirova@mail.ru
Rússia, Ufa

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2. Fig. 1. Thermograms of PLA-1 (1, 3) and PLA-2 (2, 4, 5) samples. Curves 1, 2 refer to the original samples, curves 3-5 - to the samples obtained at temperatures in the plasticization/compression zone 190С/190С and pressure in the press of 10 000 kgf. The rate of temperature cooling in the press was 60 (3, 4) and 15С/min (5).

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3. Fig. 2. Dependence of the elastic modulus of PLA-1 (a) and PLA-2 (b) samples on the value of pressure in the press for samples obtained with the cooling rate after pressing 10 (1), 15 (2) and 60С/min (3).

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4. Fig. 3. Dependence of tensile stress of PLA-1 (a) and PLA-2 (b) specimens on the value of pressure in the press for specimens obtained with cooling rate after pressing 10 (1), 15 (2) and 60С/min (3).

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5. Fig. 4. Dependence of breaking elongation of PLA-1 (a) and PLA-2 (b) specimens on the value of pressure in the press for specimens obtained with the cooling rate after pressing 10 (1), 15 (2) and 60С/min (3).

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