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Volynskiĭ, A. L.; Трофимчук, Е. С.; Никонорова, Н. И.; Бакеев, Н. Ф.

doi:10.1023/a:1016388231659

Cited by 11 publications

(5 citation statements)

References 1 publication

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“…The surface morphology shown in figure 9 responds to the SEM micrographs presented in figures 2(a), (c) and in figure 5(a). Previously, similar orienting effect of the fibrillar-porous structure, developed via the crazing mechanism, has been observed during the process of various inorganic and organic substances crystallization [24], including liquid crystals [20,25], on polymer's surface and in the pore's volume. This experimental fact is likely linked to a high specific surface of nanofibrils, causing improved cells adhesion.…”

Section: Resultssupporting

confidence: 58%

Novel approach to obtain composite poly-L-lactide based films blended with starch and calcium phosphates and their bioactive properties

Фадеева

Трофимчук

Giretová

et al. 2015

Biomed. Phys. Eng. Express

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A novel approach for preparation of composite materials based on the poly-L-lactide (PL), starch and calcium phosphates is provided, applying the polymer crazing process in liquid absorption active medium. For composite films preparation, PL and blends of PL and starch have been chosen as polymeric matrixes. Pores formation in the polymer films occurred during the process of uniaxial stretching in the presence of ethanol or water-ethanol mixtures via the solvent-crazing mechanism. The diameter of pores and fibrils in crazed PL was 20-30 nm. Porous polymer matrixes have been loaded with starch, using crazing mechanism, and filled with calcium phosphates (CP) by the countercurrent diffusion method, the content of starch and CP being up to 11.0 and 14.5 wt%, respectively. The obtained composites were investigated by XRD, SEM-EDS and TEM methods. It was found out that the starch filled the porous crazed structure of polymer, while the CP synthesis in the PL pores resulted in the formation of amorphous particles with the diameter of about 20 nm. These CP nanoparticles aggregated into the submicron particles of 100-300 nm in diameter. The bioactivity of the initial and porous poly-L-lactide films, and composites, based on PL with starch and calcium phosphates, was investigated. It was shown that the bioactivity depends on the chemical composition and surface morphology of the prepared materials. After 10 days of cultivation of the pre-osteoblastic MC3T3E1 cells, an intense, 6 times, growth of osteoblast population was achieved for the composite containing calcium phosphates. This result is perceptibly higher than those obtained for other samples (4 times growth) and for the control sample (5 times growth). Based on the results of in vitro tests, it can be concluded that the prepared materials are promising for biomedical applications.

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Section: Resultssupporting

confidence: 58%

Novel approach to obtain composite poly-L-lactide based films blended with starch and calcium phosphates and their bioactive properties

Фадеева

Трофимчук

Giretová

et al. 2015

Biomed. Phys. Eng. Express

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“…Additionally, since the dissolved compounds are swept into the fiber by active wetting of the microvoids and retained inside the fiber for steric reasons, chemical compatibility of the additive and the polymeric material is not necessary. A number of unusual material combinations such as AgCl in poly(propylene),27 nickel in poly(propylene), and metallic copper in poly(ethylene terephthalate) (PET)28, 29 have been prepared by solvent crazing, but potential industrial or medical applications have not yet been shown.…”

Section: Introductionmentioning

confidence: 99%

Solvent‐crazed PET fibers imparting antibacterial activity by release of Zn²⁺

Weichold¹,

Goel²,

Lehmann³

et al. 2009

J of Applied Polymer Sci

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Poly(ethylene terephthalate) fibers containing zinc chloride in the fiber bulk were prepared by solvent crazing. Fibers containing 6 g/Kg and 13 g/Kg Zn 2þ were investigated. SEM-EDX analyses and the formation of the pink bis(1,5-dithiocarbazonato-N,S) complex inside the fibers confirm the presence of zinc. UV-Vis spectroscopy indicates a slow release of zinc ions into the aqueous media and, thus, the fibers serve as a release system to inhibit the growth of Escherichia coli during the first exposure. Thermal annealing of the freshly prepared fibers above T g was shown to modify the release profile so that bacterial growth was also inhibited during repetitive and prolonged exposures. The washing fastness is fair and after 10 washing cycles, $ 30% of the original zinc content still remains in the fiber.

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“…This method allows a polymer to be filled uniformly with the second component and disperse filler effectively to the nanometrical level. 11 In the paper crazing was used as a delivery method of the compound precursor into a polymer matrix with its following hydrolysis in nanopores' volume. This approach opens up the possibility to prevent aggregation of particles in the process of hydrolysis and preserve high mutual dispersion of polymer matrix and silicate filler.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper we suggest another method for the preparation of polymer/silicate systems using the phenomenon of crazing of polymers in a liquid medium. , In the process of crazing active liquid medium penetrates into the volume of a polymer which leads to its dispersion and to formation of nanoporous system. This method allows a polymer to be filled uniformly with the second component and disperse filler effectively to the nanometrical level . In the paper crazing was used as a delivery method of the compound precursor into a polymer matrix with its following hydrolysis in nanopores' volume.…”

Section: Introductionmentioning

confidence: 99%

Polypropylene/Silicate Composites on the Basis of Crazed Polymer and Hyperbranched Polyethoxysiloxane

et al. 2007

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Hyperbranched polyethoxysiloxane (HPEOS) is suggested as an adsorption-active medium in the crazing of commercial polypropylene film and as a precursor of silica. As a result of delocalized crazing of polypropylene, the nanoporous materials characterized by the effective volume porosity to 60 vol % are received. The reaction of HPEOS hydrolysis into pores of a polymer at the presence of acidic and basic catalysts is studied. Obtained silica phase is shown to stabilize the nanoporous structure of crazed polypropylene. The morphology of polymer/silicate composite is fully determined by the structure of crazed polymer matrices, and it is a system of organic/inorganic interpenetrative nets. Because of this structure, the tensile modulus of the composite material exceeds the modulus of the initial polymer by 50-100%.

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Cited by 11 publications

References 1 publication

Novel approach to obtain composite poly-L-lactide based films blended with starch and calcium phosphates and their bioactive properties

Novel approach to obtain composite poly-L-lactide based films blended with starch and calcium phosphates and their bioactive properties

Solvent‐crazed PET fibers imparting antibacterial activity by release of Zn²⁺

Polypropylene/Silicate Composites on the Basis of Crazed Polymer and Hyperbranched Polyethoxysiloxane

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Untitled

Cited by 11 publications

References 1 publication

Novel approach to obtain composite poly-L-lactide based films blended with starch and calcium phosphates and their bioactive properties

Novel approach to obtain composite poly-L-lactide based films blended with starch and calcium phosphates and their bioactive properties

Solvent‐crazed PET fibers imparting antibacterial activity by release of Zn2+

Polypropylene/Silicate Composites on the Basis of Crazed Polymer and Hyperbranched Polyethoxysiloxane

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Solvent‐crazed PET fibers imparting antibacterial activity by release of Zn²⁺