| Title | Efficient recycling pathway of bio-based composite polyurethane foams via sustainable diamine |
|---|---|
| ID_Doc | 10134 |
| Authors | Recupido, F; Lama, GC; Steffen, S; Dreyer, C; Seidlitz, H; Russo, V; Lavorgna, M; Bossa, FD; Silvano, S; Boggioni, L; Verdolotti, L |
| Title | Efficient recycling pathway of bio-based composite polyurethane foams via sustainable diamine |
| Year | 2024 |
| Published | |
| Abstract | 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 (sigma 10 %=71 +/- 9 kPa, lambda = 0.042 +/- 0.015 W center dot m-1 center dot 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. |
| https://doi.org/10.1016/j.ecoenv.2023.115758 |
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