Autor: Sajkiewicz, P. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Investigations of polycaprolactone/gelatin blends in terms of their miscibility
Autorzy:: Kolbuk, D.
Sajkiewicz, P.
Denis, P.
Choinska, E.
Powiązania:: https://bibliotekanauki.pl/articles/200281.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: blends
compatibility
miscibility
polycaprolactone
gelatin
Opis:: Synthetic and natural polymers blends represent a new brand of materials with application in wound healing, scaffolds or drug delivery systems. Polycaprolactone/gelatin (PCL/Gt) blends were analyzed in terms of their miscibility. The PCL structure was investigated as a function of Gt content. Changes in the PCL spherulitic structure with Gt content were investigated by a polarizing-interference microscope. The analysis of the glass transition temperature (Tg) of both components as a function of PCL/Gt ratio by differential scanning calorimetry indicates that the system of polycaprolactone/gelatin belongs to a type of s.c. compatible system, being intermediate between miscible and immiscible systems. There is possibility of very limited miscibility of both components. Supplementary wide angle X-ray scattering results are presented.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 629-632
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The preliminary studies of a structure and electrospinning of new polyurethanes based on synthetic atactic poly[(R, S)-3-hydroxybutyrate]
Autorzy:: Sajkiewicz, P.
Brzeska, J.
Denis, P.
Sikorska, W.
Kowalczuk, M.
Rutkowska, M.
Powiązania:: https://bibliotekanauki.pl/articles/201693.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: polyurethane
polyhydroxybutyrate
electrospinning
scaffolds
Opis:: Novel polyurethanes based on synthetic, atactic poly[(R, S)-3-hydroxybutyrate] (a-PHB) and polycaprolactone (PCL) or polyoxytetramethylene (PTMG) diols were synthesized. It was shown that the presence of a-PHB within soft segments reduces crystallinity of PUR. Because of the low melting temperature for polyurethanes with PCL in soft segments, at this stage of work, electrospinning was limited to polyurethanes containing PTMG and a-PHB. Polyurethane containing 80% of PTMG and 20% of a-PHB was electrospun at various parameters from hexafluoro-2-propanole solution, resulting in formation of fibers with the average diameter ca. 2 μm. The fiber diameter decreased with decreasing polymer concentration in a solution and was practically insensitive to the needle-collector distance in the applied range of distances.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 1; 55-60
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Influence of process-material conditions on the structure and biological properties of electrospun polyvinylidene fluoride fibers
Autorzy:: Zaszczyńska, A.
Sajkiewicz, P. Ł.
Gradys, A.
Tymkiewicz, R.
Urbanek, O.
Kołbuk, D.
Powiązania:: https://bibliotekanauki.pl/articles/200237.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: scaffolds
electrospinning
polyvinylidene fluoride
tissue engineering
Opis:: Polyvinylidene fluoride (PVDF) is one of the most important piezoelectric polymers. Piezoelectricity in PVDF appears in polar b and ɣ phases. Piezoelectric fibers obtained by means of electrospinning may be used in tissue engineering (TE) as a smart analogue of the natural extracellular matrix (ECM). We present results showing the effect of rotational speed of the collecting drum on morphology, phase content and in vitro biological properties of PVDF nonwovens. Morphology and phase composition were analyzed using scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR), respectively. It was shown that increasing rotational speed of the collector leads to an increase in fiber orientation, reduction in fiber diameter and considerable increase of polar phase content, both b and g. In vitro cell culture experiments, carried out with the use of ultrasounds in order to generate electrical potential via piezoelectricity, indicate a positive effect of polar phases on fibroblasts. Our preliminary results demonstrate that piezoelectric PVDF scaffolds are promising materials for tissue engineering applications, particularly for neural tissue regeneration, where the electric potential is crucial.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 627-633
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Cephalanthera rubra (L.) Rich. (Orchidaceae) in Mid-West Poland (Wielkopolska) - distribution, endangerment and conservation status
Autorzy:: Sajkiewicz, R.
Gabka, M.
Owsianny, P.M.
Powiązania:: https://bibliotekanauki.pl/articles/878508.pdf
Data publikacji:: 2009
Wydawca:: Uniwersytet Przyrodniczy w Poznaniu
Źródło:: Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana; 2009, 13
1896-1908
Pojawia się w:: Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana
Dostawca treści:: Biblioteka Nauki

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