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Acosta AP, Kairytė A, Członka S, Miedzińska K, Aramburu AB, Barbosa KT, Amico SC, Delucis RDA. Rigid Polyurethane Biofoams Filled with Pine Seed Shell and Yerba Mate Wastes. Polymers (Basel) 2023; 15:polym15092194. [PMID: 37177340 PMCID: PMC10180977 DOI: 10.3390/polym15092194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Revised: 04/29/2023] [Accepted: 05/02/2023] [Indexed: 05/15/2023] Open
Abstract
Pine seed shells and yerba mate are common wastes leftover from the food and beverage industry. This study presents the development of rigid polyurethane foams (RPUFs) filled with pine seed shells and yerba mate at 5, 10 and 15 wt%. The fillers were characterized for chemical properties using bench chemistry analyses, and the RPUFs were investigated in terms of chemical, morphological, mechanical, thermal and colorimetric characteristics. The main results indicated that yerba mate showed good compatibility with the polyurethane system, probably because its available hydroxyl groups reacted with isocyanate groups to form urethane bonds, producing increases in mechanical and thermal properties. However, pine seed shell did not appear to be compatible. Anisotropy increased slightly, as there was an increase in the percentage of reinforcement. The mechanical properties of the yerba mate reinforced foams proved stable, while there was a loss of overall up to ~50% for all mechanical properties in those reinforced with pine seed shell. Thermal properties were improved up to ~40% for the yerba mate reinforced foams, while those reinforced with pine nuts were stable. It was possible to observe a decrease in the glass transition temperature (Tg) of ~-5 °C for the yerba mate reinforced foams and ~-14 °C for the pine seed shell reinforced ones.
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Affiliation(s)
- Andrey Pereira Acosta
- Postgraduate Program in Mining, Metallurgical and Materials Engineering, Federal University of Rio Grande do Sul, Porto Alegre 91501-970, Brazil
| | - Agnė Kairytė
- Laboratory of Thermal Insulating Materials and Acoustics, Institute of Building Materials, Faculty of Civil Engineering, Vilnius Gediminas Technical University, Linkmenų St. 28, 08217 Vilnius, Lithuania
| | - Sylwia Członka
- Institute of Polymer and Dye Technology, Faculty of Chemistry, Lodz University of Technology, Stefanowskiego 12/16, 90-924 Lodz, Poland
| | - Karolina Miedzińska
- Institute of Polymer and Dye Technology, Faculty of Chemistry, Lodz University of Technology, Stefanowskiego 12/16, 90-924 Lodz, Poland
| | - Arthur Behenck Aramburu
- Postgraduate Program in Mining, Metallurgical and Materials Engineering, Federal University of Rio Grande do Sul, Porto Alegre 91501-970, Brazil
| | - Kelvin Techera Barbosa
- Postgraduate Program in Mining, Metallurgical and Materials Engineering, Federal University of Rio Grande do Sul, Porto Alegre 91501-970, Brazil
| | - Sandro Campos Amico
- Postgraduate Program in Mining, Metallurgical and Materials Engineering, Federal University of Rio Grande do Sul, Porto Alegre 91501-970, Brazil
| | - Rafael de Avila Delucis
- Postgraduate Program in Materials Science and Engineering (PPGCEM), Technology Development Center, Federal University of Pelotas (UFPel), Pelotas 96010-610, Brazil
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del Amo J, Borreguero AM, Ramos MJ, Rodríguez JF. Glycolysis of Polyurethanes Composites Containing Nanosilica. Polymers (Basel) 2021; 13:polym13091418. [PMID: 33925763 PMCID: PMC8125480 DOI: 10.3390/polym13091418] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 04/20/2021] [Accepted: 04/21/2021] [Indexed: 11/19/2022] Open
Abstract
Rigid polyurethane (RPU) foams have been successfully glycolyzed by using diethylene glycol (DEG) and crude glycerol (CG) as transesterification agents. However, DEG did not allow to achieve a split-phase process, obtaining a product with low polyol purity (61.7 wt %). On contrary, CG allowed to achieve a split-phase glycolysis improving the recovered polyol purity (76.5%). This is an important novelty since, up to now, RPUs were glycolyzed in single-phase processes giving products of low polyol concentration, which reduced the further applications. Moreover, the nanosilica used as filler of the glycolyzed foams was recovered completely pure. The recovered polyol successfully replaced up to 60% of the raw polyol in the synthesis of RPU foams and including the recovered nanosilica in the same concentration than in glycolyzed foam. Thus, the feasibility of the chemical recycling of this type of polyurethane composites has been demonstrated. Additionally, PU foams were synthesized employing fresh nanosilica to evaluate whether the recovered nanosilica has any influence on the RPU foam properties. These foams were characterized structurally, mechanically and thermally with the aim of proving that they met the specifications of commercial foams. Finally, the feasibility of recovering the of CG by vacuum distillation has been demonstrated.
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Bote SD, Kiziltas A, Scheper I, Mielewski D, Narayan R. Biobased flexible polyurethane foams manufactured from lactide‐based polyester‐ether polyols for automotive applications. J Appl Polym Sci 2021. [DOI: 10.1002/app.50690] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Sayli Devdas Bote
- Department of Chemical Engineering and Materials Science Michigan State University East Lansing Michigan USA
| | - Alper Kiziltas
- Materials Research and Advanced Engineering Ford Motor Company Dearborn Michigan USA
| | - Ian Scheper
- Department of Chemical Engineering and Materials Science Michigan State University East Lansing Michigan USA
| | - Deborah Mielewski
- Materials Research and Advanced Engineering Ford Motor Company Dearborn Michigan USA
| | - Ramani Narayan
- Department of Chemical Engineering and Materials Science Michigan State University East Lansing Michigan USA
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