Efficient recycling pathway of bio-based composite polyurethane foams via sustainable diamine.

Autor: Recupido F; Institute of Polymers, Composites and Biomaterials, Italian National Research Council, P.le. E. Fermi 1, 80055 Portici, Naples, Italy., Lama GC; Institute of Polymers, Composites and Biomaterials, Italian National Research Council, P.le. E. Fermi 1, 80055 Portici, Naples, Italy., Steffen S; Fraunhofer-Institute for Applied Polymer Research IAP Research Division Polymeric Materials and Composites PYCO, Schmiedestrasse 5, 15745 Wildau, Germany., Dreyer C; Fraunhofer-Institute for Applied Polymer Research IAP Research Division Polymeric Materials and Composites PYCO, Schmiedestrasse 5, 15745 Wildau, Germany., Seidlitz H; Fraunhofer-Institute for Applied Polymer Research IAP Research Division Polymeric Materials and Composites PYCO, Schmiedestrasse 5, 15745 Wildau, Germany., Russo V; Department of Chemical Sciences, University of Naples, Federico II, Via Cinthia 4, 80126 Naples, Italy., Lavorgna M; Institute of Polymers, Composites and Biomaterials, Italian National Research Council, P.le. E. Fermi 1, 80055 Portici, Naples, Italy., De Luca Bossa F; Institute of Polymers, Composites and Biomaterials, Italian National Research Council, P.le. E. Fermi 1, 80055 Portici, Naples, Italy., Silvano S; Institute of Chemical Sciences and Technologies 'G. Natta, Italian National Research Council, Via A. Corti 12, 20133 Milan, Italy., Boggioni L; Institute of Chemical Sciences and Technologies 'G. Natta, Italian National Research Council, Via A. Corti 12, 20133 Milan, Italy. Electronic address: laura.boggioni@cnr.it., Verdolotti L; Institute of Polymers, Composites and Biomaterials, Italian National Research Council, P.le. E. Fermi 1, 80055 Portici, Naples, Italy. Electronic address: letizia.verdolotti@cnr.it.
Jazyk: angličtina
Zdroj: Ecotoxicology and environmental safety [Ecotoxicol Environ Saf] 2024 Jan 01; Vol. 269, pp. 115758. Date of Electronic Publication: 2023 Dec 20.
DOI: 10.1016/j.ecoenv.2023.115758
Abstrakt: Aminolysis is widely recognized as a valuable chemical route for depolymerizing polymeric materials containing ester, amide, or urethane functional groups, including polyurethane foams. Bio-based polyurethane foams, pristine and reinforced with 40 wt% of sustainable fillers, were depolymerized in the presence of bio-derived butane-1,4-diamine, BDA. A process comparison was made using fossil-derived ethane-1,2-diamine, EDA, by varying amine/polyurethane ratio (F/A, 1:1 and 1:0.6). The obtained depolymerized systems were analyzed by FTIR and NMR characterizations to understand the effect of both diamines on the degradation pathway. The use of bio-based BDA seemed to be more effective with respect to conventional EDA, owing to its stronger basicity (and thus higher nucleophilicity), corresponding to faster depolymerization rates. BDA-based depolymerized systems were then employed to prepare second-generation bio-based composite polyurethane foams by partial replacement of isocyanate components (20 wt%). The morphological, mechanical, and thermal conductivity properties of the second-generation polyurethane foams were evaluated. The best performances (σ10 %=71 ± 9 kPa, λ = 0.042 ± 0.015 W∙ m -1 ∙K -1 ) were attained by employing the lowest F/A ratio (1:0.6); this demonstrates their potential application in different sectors such as packaging or construction, fulfilling the paradigm of the circular economy.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 The Authors. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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