9 research outputs found
Polyhydroxyalkanoates Composites and Blends: Improved Properties and New Applications
Composites of Polyhydroxyalkanoates (PHAs) have been proven to have enhanced properties in comparison to the pure form of these polyesters. Depending on what polymer or material is added to PHAs, the enhancement of different properties is observed. Since PHAs are explored for usage in diverse fields, understanding what blends affect what properties would guide further investigations towards application. This article reviews works that have been carried out with composite variation for application in several fields. Some properties of PHAs are highlighted and composite variation for their modulations are explored
Electrospinning of Fiber Matrices from Polyhydroxybutyrate for the Controlled Release Drug Delivery Systems
The submission provides an overview of current state of the problem and authorsβ experimental data on manufacturing nonwoven fibrous matrices for the controlled release drug delivery systems (CRDDS). The choice of ultrathin fibers as effective carriers is determined by their characteristics and functional behavior, for example, such as a high specific surface area, anisotropy of some physicochemical characteristics, spatial limitations of segmental mobility that are inherent in nanosized objects, controlled biodegradation, and controlled diffusion transport. The structural-dynamic approach to the study of the morphology and diffusion properties of biopolymer fibers based on polyhydroxybutyrate (PHB) is considered from several angles. In the submission, the electrospinning (ES) application to reach specific characteristics of materials for controlled release drug delivery is discussed
ΠΠ»Π΅Π½ΠΎΡΠ½ΡΠ΅ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Ρ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΏΠΎΠ»ΠΈΡΡΠΈΠ»Π΅Π½Π° Ρ Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡΠ°ΠΌΠΈ ΠΊΡΠ΅ΠΌΠ½ΠΈΡ ΠΈ ΠΊΠ°ΡΠ±ΠΈΠ΄Π° ΠΊΡΠ΅ΠΌΠ½ΠΈΡ
Polyethylene films containing 0.1-1.5% of mass of n-SiΠ‘ and n-Si nanoparticles have been produced by the extrusion method. Using the spectral analysis method, it was found that the obtained films absorb UV radiation in the range 200-400 nm, which is harmful to organic substance. The average particle sizes and the quality of their dispersion in the films were determined by X-ray diffraction analysis. Using differential scanning calorimetry and physical and mechanical tests, it was found that nanoparticles did not affect the formation of the internal structure of the matrix polyethylene. The degree of crystallinity, the melting point and crystallization remain unchanged. The properties of the film surface, studied by the tribological, triboelectric methods and the determination of the wetting angle, remain constant and do not differ from the properties of PE films with nanoparticle content 0.1-1%. At 1.5% n-SiC content, a change in the surface microrelief is diagnosed, leading to a slight increase in the friction coefficient of the films. The polyethylene films filled with n-SiΠ‘ and n-Si obtained in this work are recommended for use as UV protective coatings for various purposes.Π Π½Π°ΡΡΠΎΡΡΠ΅ΠΉ Π½Π°ΡΡΠ½ΠΎ-ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΠ΅Π»ΡΡΠΊΠΎΠΉ ΡΠ°Π±ΠΎΡΠ΅ ΡΠΊΡΡΡΡΠ·ΠΈΠΎΠ½Π½ΡΠΌ ΡΠΏΠΎΡΠΎΠ±ΠΎΠΌ Π±ΡΠ»ΠΈ ΠΏΠΎΠ»ΡΡΠ΅Π½Ρ ΠΏΠΎΠ»ΠΈΡΡΠΈΠ»Π΅Π½ΠΎΠ²ΡΠ΅ ΠΏΠ»Π΅Π½ΠΊΠΈ, ΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠΈΠ΅ 0,1-1,5% (ΠΌΠ°Ρ.) Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡΡ n-SiΠ‘ ΠΈ n-Si, ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ ΠΏΠ»Π°Π·ΠΌΠΎΡ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΠΌ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ. Π‘ ΠΏΠΎΠΌΠΎΡΡΡ ΡΠΏΠ΅ΠΊΡΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΎΠ΄Π° Π°Π½Π°Π»ΠΈΠ·Π° ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ ΠΏΠ»Π΅Π½ΠΊΠΈ ΠΏΠΎΠ³Π»ΠΎΡΠ°ΡΡ Π£Π€-ΠΈΠ·Π»ΡΡΠ΅Π½ΠΈΠ΅ Π² Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π΅ 200-400 Π½ΠΌ, Π³ΡΠ±ΠΈΡΠ΅Π»ΡΠ½ΠΎΠ΅ Π΄Π»Ρ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΌΠ°ΡΠ΅ΡΠΈΠΈ. ΠΠ΅ΡΠΎΠ΄ΠΎΠΌ ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΡΡΡΡΠΊΡΡΡΠ½ΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π° Π±ΡΠ»ΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½Ρ ΡΡΠ΅Π΄Π½ΠΈΠ΅ ΡΠ°Π·ΠΌΠ΅ΡΡ ΡΠ°ΡΡΠΈΡ ΠΈ ΠΊΠ°ΡΠ΅ΡΡΠ²ΠΎ ΠΈΡ
Π΄ΠΈΡΠΏΠ΅ΡΠ³ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π² ΠΏΠ»Π΅Π½ΠΊΠ°Ρ
. ΠΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ Π΄ΠΈΡΡΠ΅ΡΠ΅Π½ΡΠΈΠ°Π»ΡΠ½ΠΎΠΉ ΡΠΊΠ°Π½ΠΈΡΡΡΡΠ΅ΠΉ ΠΊΠ°Π»ΠΎΡΠΈΠΌΠ΅ΡΡΠΈΠΈ ΠΈ ΡΠΈΠ·ΠΈΠΊΠΎ-ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈΡΠΏΡΡΠ°Π½ΠΈΠΉ ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡΡ Π½Π΅ Π²Π»ΠΈΡΡΡ Π½Π° ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ Π²Π½ΡΡΡΠ΅Π½Π½Π΅ΠΉ ΡΡΡΡΠΊΡΡΡΡ ΠΏΠΎΠ»ΠΈΡΡΠΈΠ»Π΅Π½Π° (ΠΠ) ΠΌΠ°ΡΡΠΈΡΡ. Π‘ΡΠ΅ΠΏΠ΅Π½Ρ ΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΡΠ½ΠΎΡΡΠΈ, ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΡ ΠΏΠ»Π°Π²Π»Π΅Π½ΠΈΡ ΠΈ ΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΠ·Π°ΡΠΈΠΈ ΠΎΡΡΠ°ΡΡΡΡ Π½Π΅ΠΈΠ·ΠΌΠ΅Π½Π½ΡΠΌΠΈ. Π‘Π²ΠΎΠΉΡΡΠ²Π° ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ ΠΏΠ»Π΅Π½ΠΎΠΊ, ΠΈΡΡΠ»Π΅Π΄ΡΠ΅ΠΌΡΠ΅ ΡΡΠΈΠ±ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ, ΡΡΠΈΠ±ΠΎΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ ΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ΠΌ ΠΊΡΠ°Π΅Π²ΠΎΠ³ΠΎ ΡΠ³Π»Π° ΡΠΌΠ°ΡΠΈΠ²Π°Π½ΠΈΡ, ΠΎΡΡΠ°ΡΡΡΡ ΠΏΠΎΡΡΠΎΡΠ½Π½ΡΠΌΠΈ ΠΈ Π½Π΅ ΠΎΡΠ»ΠΈΡΠ°ΡΡΡΡ ΠΎΡ ΡΠ²ΠΎΠΉΡΡΠ² ΠΠ-ΠΏΠ»Π΅Π½ΠΎΠΊ ΠΏΡΠΈ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΠΈ Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡ ΠΎΡ 0,1 Π΄ΠΎ 1%. ΠΡΠΈ 1,5% ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΠΈ n-SiΠ‘ Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΡΡΠ΅ΡΡΡ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ ΠΌΠΈΠΊΡΠΎΡΠ΅Π»ΡΠ΅ΡΠ° ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ, ΠΏΡΠΈΠ²ΠΎΠ΄ΡΡΠ΅Π΅ ΠΊ Π½Π΅Π±ΠΎΠ»ΡΡΠΎΠΌΡ ΡΠΎΡΡΡ ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½ΡΠ° ΡΡΠ΅Π½ΠΈΡ ΠΏΠ»Π΅Π½ΠΎΠΊ. ΠΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ Π² ΡΠ°Π±ΠΎΡΠ΅ Π½Π°ΠΏΠΎΠ»Π½Π΅Π½Π½ΡΠ΅ n-SiΠ‘ ΠΈ n-Si ΠΏΠΎΠ»ΠΈΡΡΠΈΠ»Π΅Π½ΠΎΠ²ΡΠ΅ ΠΏΠ»Π΅Π½ΠΊΠΈ ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄ΡΡΡΡΡ Π΄Π»Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ Π£Π€ Π·Π°ΡΠΈΡΠ½ΡΡ
ΠΏΠΎΠΊΡΡΡΠΈΠΉ ΡΠ°Π·Π»ΠΈΡΠ½ΠΎΠ³ΠΎ Π½Π°Π·Π½Π°ΡΠ΅Π½ΠΈΡ
Thermo-oxidative destruction and biodegradation of nanomaterials from composites of poly(3-hydroxybutyrate) and chitosan
A complex of structure-sensitive methods of morphology analysis was applied to study film materials obtained from blends of poly(3-hydroxybutyrate) (PHB) and chitosan (CHT) by pouring from a solution, and nonwoven fibrous materials obtained by the method of electrospinning (ES). It was found that with the addition of CHT to PHB, a heterophase system with a nonequilibrium stressed structure at the interface was formed. This system, if undergone accelerated oxidation and hydrolysis, contributed to the intensification of the growth of microorganisms. On the other hand, the antimicrobial properties of CHT led to inhibition of the biodegradation process. Nonwoven nanofiber materials, since having a large specific surface area of contact with an aggressive agent, demonstrated an increased ability to be thermo-oxidative and for biological degradation in comparison with film materials. Β© 2021 by the authors. Licensee MDPI, Basel, Switzerland
Film Materials Based on Polyethylene with Silicon Nanoparticles and Silicon Carbide
Abstract: In this research and development, the extrusion method was used to obtain polyethylene films containing 0.1β1.5 wt % n-SiC and n-Si nanoparticles obtained by the plasma chemical method. Using the spectral analysis method, it was found that the films obtained absorb UV radiation in the range of 200β400 nm, which is harmful to organic matter. The method of X-ray structural analysis was used to determine the average size of particles and the quality of their dispersion in the films. Differential scanning calorimetry and physicomechanical tests have shown that nanoparticles do not affect the formation of the internal structure of the polyethylene (PE) matrix. The degree of crystallinity, melting point, and crystallization point remain unchanged. The properties of the surface of the films, studied by tribological and triboelectric methods and determination of the contact angle, remain constant and do not differ from the properties of PE films with a nanoparticle content from 0.1 to 1%. At 1.5% nSiC content, a change in the surface microrelief is diagnosed, leading to a small increase in the film friction coefficient. The polyethylene films filled with n-SiC and n-Si obtained in this work are recommended for use as UV protective coatings for various purposes. Β© 2021, Pleiades Publishing, Ltd
Aggressive impacts affecting the biodegradable ultrathin fibers based on poly(3-hydroxybutyrate), polylactide and their blends: Water sorption, hydrolysis and ozonolysis
Ultrathin electrospun fibers of pristine biopolyesters, poly(3-hydroxybutyrate) (PHB) and polylactic acid (PLA), as well as their blends, have been obtained and then explored after exposure to hydrolytic (phosphate buffer) and oxidative (ozone) media. All the fibers were obtained from a co-solvent, chloroform, by solution-mode electrospinning. The structure, morphology, and segmental dynamic behavior of the fibers have been determined by optical microscopy, SEM, ESR, and others. The isotherms of water absorption have been obtained and the deviation from linearity (the Henry low) was analyzed by the simplified model. For PHB-PLA fibers, the loss weight increments as the reaction on hydrolysis are symbate to water absorption capacity. It was shown that the ozonolysis of blend fibrils has a two-stage character which is typical for O3 consumption, namely, the pendant groupβs oxidation and the autodegradation of polymer molecules with chain rupturing. The first stage of ozonolysis has a quasi-zero-order reaction. A subsequent second reaction stage comprising the back-bone destruction has a reaction order that differs from the zero order. The fibrous blend PLA/PHB ratio affects the rate of hydrolysis and ozonolysis so that the fibers with prevalent content of PLA display poor resistance to degradation in aqueous and gaseous media. Β© 2021 by the authors. Licensee MDPI, Basel, Switzerland
Biocompatibility and Bioresorption of 3D-Printed Polylactide and Polyglycolide Tissue Membranes
We studied biocompatibility and bioresorption of 3D-printed polylactide and polyglycolide tissue membranes. Ultrasound microscopy and histological examination showed that membranes fabricated of a copolymer of lactic and glycolic acids in a mass ratio of 1:9 are bioresorbed and have good biocompatibility with soft tissues (connective tissue, adipose tissue, and epithelium). An important feature of the copolymer membranes, which differs them from pure polylactide membranes, is the formation of a thin fibrous capsule that did not interfere its destruction by the mechanism of hydrolytic resorption. Β© 2021, Springer Science+Business Media, LLC, part of Springer Nature