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262 results on '"Prociak, Aleksander"'

15. Open-Cell Spray Polyurethane Foams Based on Biopolyols from Fruit Seed Oils.

Author

Kurańska, Maria, Malewska, Elżbieta, Ożóg, Hubert, Sędzimir, Julia, Put, Aleksandra, Kowalik, Natalia, Michałowski, Sławomir, Zemła, Marcin, Kucała, Michał, and Prociak, Aleksander

Subjects
FRUIT seeds, URETHANE foam, THERMAL conductivity, THERMAL insulation, FOAM cells, WATERMELONS, POMEGRANATE, OILSEEDS
Abstract

Natural oils from watermelon, cherry, black currant, grape and pomegranate fruit seeds were applied in the synthesis of biopolyols using the transesterification reaction. In this manuscript, the preparation possibility of open-cell foams from a polyurethane system in which petrochemical polyol was fully replaced with biopolyols is analyzed. Firstly, polyurethane foam systems were developed on a laboratory scale, and they were next tested under industrial conditions. It was shown that the foaming method has a significant impact on the foaming process and the cell structure of obtained foams as well as their thermal insulation properties. Based on the conducted research, it was found that the method of processing the polyurethane system has a significant impact on the properties of open-cell spray foams. Foams produced under industrial conditions have a much higher cell density, which has a positive effect on their selected physical–mechanical properties compared to foams produced on a laboratory scale. The open-cell biofoams obtained using a high-pressure machine had apparent densities 12–17 kg/m3, thermal conductivity coefficients 35–37 mW/m·K, closed-cell contents < 10% and were dimensionally stable at low and high temperatures. [ABSTRACT FROM AUTHOR]

Published
2024
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16. The Polyurethane-Polystyrene Composite—Influence of the Blowing Agent Type on the Foaming Process, the Structure and the Properties.

Author

Malewska, Elżbieta, Prociak, Aleksander, Świdzińska-Grela, Natalia, and Kurańska, Maria

Subjects
BLOWING agents, SURFACE active agents, FOAM, DIELECTRIC polarization, EXOTHERMIC reactions, COMPOSITE structures
Abstract

In this study, polyurethane-polystyrene composites (RPURF-EPS) were obtained with the co-expansion method. This method consists of utilizing the heat of the exothermic reaction of polyurethane (PUR) formation to expand polystyrene beads (PSBs). The materials were obtained using polyurethane systems based on the selected blowing agents, such as cyclopentane, a mixture of fluorocarbons and water. The analysis of the foaming process was carried out using a special device called FOAMAT. The characteristic start, rise, gelation and curing times were defined. The rise profile, the reaction temperature, the pressure and the dielectric polarization were measured. The influence of selected blowing agents on the cell structure and physical–mechanical properties of reference rigid polyurethane foam (RPURF) and RPURF-EPS, such as apparent density, compressive strength and thermal conductivity, were evaluated. Based on the research, the blowing agents that have the most beneficial influence on the properties and structure of the composites and that provide the most efficient expansion of PSBs in a light porous composite were found. [ABSTRACT FROM AUTHOR]

Published
2024
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24. Application of Modified Seed Oils of Selected Fruits in the Synthesis of Polyurethane Thermal Insulating Materials.

Author

Malewska, Elżbieta, Kurańska, Maria, Tenczyńska, Maria, and Prociak, Aleksander

Subjects
THERMAL insulation, EDIBLE fats & oils, RAPESEED oil, POLYURETHANES, POMEGRANATE, FRUIT seeds, WATERMELONS, OILSEEDS
Abstract

The use of alternative raw material sources in polyurethane chemistry is necessary given the limited supply of fossil fuels, their rising prices and the concern for sustainability. The production of biopolyols from edible vegetable oils such as rapeseed oil, soybean oil or sunflower oil is often proposed. In order to avoid conflict with the global food economy, non-edible or waste oils are hoped to find application in chemical synthesis. The possibility of using oils from selected fruit seeds to obtain biopolyols is analyzed in this manuscript. Five biopolyols were obtained from watermelon, cherry, black currant, grape and pomegranate fruit seeds using the transesterification reaction of the oils with triethanolamine. Thermal insulating polyurethane foams were then obtained by replacing 75% of petrochemical polyol with the biopolyols in polyurethane systems. Based on an analysis of the foaming process, it was found that the incorporation of triethanolamine molecules into the biopolyols causes a catalytic effect. The use of such biopolyols allows eliminating the catalyst from a polyurethane foam formulation. The polyurethane biofoams obtained with the pomegranate-seed-based biopolyol were characterized by the highest content of closed cells (45 vol.%). The lowest content was found for the foams containing the currant-seed-based biopolyol (9%). The foams were characterized by thermal conductivity coefficients between 32 and 35 kW/m·K and densities of approximately 40 kg/m3. Good dimensional stability and compressive strength between 100 and 250 kPa make them suitable for use in construction. [ABSTRACT FROM AUTHOR]

Published
2024
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25. Cork Porous Biocomposites with Polyurethane Matrix Modified with Polyol Based on Used Cooking Oil

Author

Kurańska, Maria, primary, Ptak, Mariusz, additional, Malewska, Elżbieta, additional, Prociak, Aleksander, additional, Barczewski, Mateusz, additional, Dymek, Mateusz, additional, Fernandes, Fábio A. O., additional, de Sousa, Ricardo Alves, additional, Polaczek, Krzysztof, additional, Studniarz, Karolina, additional, and Uram, Katarzyna, additional

Published
2023
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26. Comprehensive Analysis of the Influence of Expanded Vermiculite on the Foaming Process and Selected Properties of Composite Rigid Polyurethane Foams

Author

Barczewski, Mateusz, primary, Kurańska, Maria, additional, Sałasińska, Kamila, additional, Aniśko, Joanna, additional, Szulc, Joanna, additional, Szafraniak-Wiza, Izabela, additional, Prociak, Aleksander, additional, Polaczek, Krzysztof, additional, Uram, Katarzyna, additional, Surmacz, Karolina, additional, and Piasecki, Adam, additional

Published
2022
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30. Microwave Assisted Synthesis, Crosslinking, and Processing of Polymeric Materials

Author

Bogdal, Dariusz, Penczek, Piotr, Pielichowski, Jan, Prociak, Aleksander, Abe, A., editor, Albertsson, A.-C., editor, Cantow, H.-J., editor, Dusek, K., editor, Edwards, S., editor, Höcker, H., editor, Joanny, J.F., editor, Kausch, H.-H., editor, Kobayashi, S., editor, Lee, K.-S., editor, Manners, I., editor, Nuyken, O., editor, Stupp, S.I., editor, Suter, U.W., editor, and Wegner, G., editor

Published
2003
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