Porous Fibrous Materials Based on Biodegradable Poly(p-dioxanone): Preparation and Applications

Khavpachev, M.; Trofimchuk, E.; Nikonorova, N.

Авторы: Khavpachev M., Trofimchuk E., Nikonorova N.
Сборник: Book of Abstracts "Virtual Conference on Chemistry and its Applications"
Тезисы
Год издания: 2020
Место издания: University of Mauritius
Первая страница: 135
Последняя страница: 135
Аннотация: In this work, a simple and effective method for obtaining functional fibrous materials based on poly(p-dioxanone) (PPDX) is proposed. PPDX, an aliphatic biodegradable polyester, is synthesized from p-dioxanone by ring-opening polymerization. This polymer can degrade in a bodily tissue within 6-12months.At the initial degrees of deformation (12-20 > ε, % > 0), a large number of crazes are formed on the surface of the fiber. Further deformation (ε > 12-20%) leads to the nucleation of the neck in the sample and is accompanied by the transition of crazes to the neck. However, the propagation of the neck becomes unstable (self-oscillating) when a certain critical length of the sample is reached. The mechanism behind this phenomenon is concerned with the thermomechanical instability of neck propagation, which is provided by the transformation of a sample’s stored energy of elastic deformation into heat during tensiledrawing of the plastic polymer. The inversely proportional relationship between the strain rate and the amplitude of the oscillations in the considered rate range is established. An increase in the strain rate leads to an increase in the degree of deformation corresponding to the beginning of self-oscillations. The PPDX neck obtained in air contains many pores, which is confirmed by the results of small-angle X-rayscattering and scanning electron microscopy. Unoriented fibers does not contain pores. PPDX-based monofilaments containing different functional additives (iodine, silver, brilliant green) were obtained by solution impregnation of porous necks. Such materials can be used in medicine as bioabsorbable suture materials with a biological activity.
Добавил в систему: Трофимчук Елена Сергеевна

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