A New Approach to the Production of Bioresorbable Suture Materials with Biological Activityстатья
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Дата последнего поиска статьи во внешних источниках: 11 апреля 2019 г.
Аннотация:The advantages of structural-mechanical modification of fibers by the mechanism of
crazing for obtaining bioresorbable suture materials with biological activity are shown. Optimal
conditions for realization of solvent crazing of polylactide fibers are determined as the stretching
rate is not more than 75% / min and the ethanol content in the water-ethanol mixture is not less than
30-40% by weight. In this case, the value of yield stress decreases by 3-5 times, and the breaking
elongation increases to 400-600%. The process of uniaxial deformation of fibers under these
conditions is accompanied by the formation of a highly dispersed oriented structure with a pore
diameter and fibrils of about 20-30 nm and bulk porosity up to 60% by volume. Moreover, the
crazing of fibers based on polylactide under these conditions is accompanied by low-temperature
crystallization, reaching a degree of crystallinity of 40%. The monofilaments based on polylactide
containing biologically active additives (brilliant green, fuchsine) by the crazing mechanism are
obtained. Such materials are promising for use in medicine as bioresorbable sutures with
antibacterial activity.