Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk

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Krzysztof Lewandowski


Ostatnie publikacje
1.  Osial M., Wilczewski S., Godlewska U., Skórczewska K., Hilus J., Szulc J., Roszkiewicz-Walczuk A., Dąbrowska A., Moazzami Goudarzi Z., Lewandowski K., Wypych T., Nguyen Phuong T., Sumara G., Giersig M., Incorporation of Nanostructural Hydroxyapatite and Curcumin Extract from Curcuma longa L. Rhizome into Polylactide to Obtain Green Composite, Polymers, ISSN: 2073-4360, DOI: 10.3390/polym16152169, Vol.16, No.15, pp.2169-1-20, 2024

Streszczenie:
This study showed that a polylactide (PLA)-based composite filled with nanostructured hydroxyapatite (HAp) and a natural extract from the rhizome of Curcuma longa L. could provide an alternative to commonly used fossil-based plasticsfor food packaging. The incorporation of HAp into the PLA matrix had a positive effect on improving selected properties of the composites; the beneficial effect could be enhanced by introducing a green modifier in the form of an extract. Prior to the fabrication of the composite, the filler was characterized in terms of morphology and composition, and the composite was then fully characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), Raman and Fourier transform infrared spectroscopy (FT-IR), and the mechanical, thermal, thermomechanical, and optical properties were investigated. The proposed material exhibits antioxidant properties against DPPH radicals and antibacterial performance against Escherichia coli (E. coli). The results showed that the nanocomposite has the highest antioxidant and antibacterial properties for 10 wt% HAp with an average diameter of rod-shaped structures below 100 nm. In addition, the introduction of turmeric extract had a positive effect on the tensile strength of the nanocomposites containing 1 and 5% HAp. As the resulting material adsorbs light in a specific wavelength range, it can be used in the medical sector, food-packaging, or coatings.

Słowa kluczowe:
polylactide, hydroxyapatite, turmeric extract, curcumin extract, green composite

Afiliacje autorów:
Osial M. - IPPT PAN
Wilczewski S. - inna afiliacja
Godlewska U. - inna afiliacja
Skórczewska K. - inna afiliacja
Hilus J. - inna afiliacja
Szulc J. - inna afiliacja
Roszkiewicz-Walczuk A. - IPPT PAN
Dąbrowska A. - Uniwersytet Warszawski (PL)
Moazzami Goudarzi Z. - IPPT PAN
Lewandowski K. - inna afiliacja
Wypych T. - inna afiliacja
Nguyen Phuong T. - inna afiliacja
Sumara G. - inna afiliacja
Giersig M. - IPPT PAN
100p.
2.  Siekierka P., Makarewicz E., Wilczewski S., Lewandowski K., Skórczewska K., Mirowski J., Osial M., Composite of Poly(Vinyl Chloride) Plastisol and Wood Flour as a Potential Coating Material, Coatings, ISSN: 2079-6412, DOI: 10.3390/coatings13111892, Vol.13, No.1892, pp.1-19, 2023

Słowa kluczowe:
poly(vinyl chloride) plastisol, wood flour, polymer-wood composite film

Afiliacje autorów:
Siekierka P. - inna afiliacja
Makarewicz E. - inna afiliacja
Wilczewski S. - inna afiliacja
Lewandowski K. - inna afiliacja
Skórczewska K. - inna afiliacja
Mirowski J. - inna afiliacja
Osial M. - IPPT PAN
100p.
3.  Wilczewski S., Skórczewska K., Tomaszewska J., Lewandowski K., Studziński W., Osial M., Jenczyk P., Grzywacz H., Domańska A., Curcuma longa L. Rhizome Extract as a Poly(vinyl chloride)/Graphene Nanocomposite Green Modifier, Molecules, ISSN: 1420-3049, DOI: 10.3390/molecules27228081, Vol.27, No.8081, pp.1-18, 2022

Streszczenie:
In this work, a method to increase the dispersion of graphene (GN) in the matrix of rigid
poly(vinyl chloride) (PVC) by using a natural plant extract from Curcuma longa L. (CE) is proposed. Currently, despite the increasing number of reports on the improvement of GN dispersion in PVC blends, still there is a need to find environmentally friendly and economical dispersion stabilizers. We proposed a stabilizer that can be easily obtained from a plant offering thermal stability and high effectiveness. PVC/GN nanocomposites stabilized with the proposed extract were investigated by SEM, AFM (structure), TGA, and Congo red test (thermal properties). Additionally, static and dynamic mechanical properties and electrical resistivity were measured. The use of CE as a graphene dispersant improved its dispersion in the PVC matrix, influenced tensile properties, increased the storage modulus and glass transition temperature, and extended the thermal stability time of nanocomposites. In this work, a CE extract is proposed as an efficient eco-friendly additive for the production of nanocomposites with an improved homogeneity of a nanofiller in the matrix and promising characteristics.

Słowa kluczowe:
nanocomposites,graphene,poly(vinyl chloride),curcuma extract

Afiliacje autorów:
Wilczewski S. - inna afiliacja
Skórczewska K. - inna afiliacja
Tomaszewska J. - inna afiliacja
Lewandowski K. - inna afiliacja
Studziński W. - inna afiliacja
Osial M. - IPPT PAN
Jenczyk P. - IPPT PAN
Grzywacz H. - IPPT PAN
Domańska A. - inna afiliacja
140p.

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