Elaboration of Thermally Performing Polyurethane Foams, Based on Biopolyols, with Thermal Insulating Applications

In this work, biobased rigid polyurethane foams (PUFs) were developed with the aim of achieving thermal and fireproofing properties that can compete with those of the commercially available products. First, the synthesis of a biopolyol from a wood residue by means of a scaled-up process with suitable yield and reaction conditions was carried out. This biopolyol was able to substitute completely the synthetic polyols that are typically employed within a polyurethane formulation. Different formulations were developed to assess the effect of two flame retardants, namely, polyhedral oligomeric silsesquioxane (POSS) and amino polyphosphate (APP), in terms of their thermal properties and degradation and their fireproofing mechanism. The structure and the thermal degradation of the different formulations was evaluated via Fourier Transformed Infrared Spectroscopy (FTIR) and thermogravimetric analysis (TGA). Likewise, the performance of the different PUF formulations was studied and compared to that of an industrial PUF. From these results, it can be highlighted that the addition of the flame retardants into the formulation showed an improvement in the results of the UL-94 vertical burning test and the LOI. Moreover, the fireproofing performance of the biobased formulations was comparable to that of the industrial one. In addition to that, it can be remarked that the biobased formulations displayed an excellent performance as thermal insulators (0.02371–0.02149 W·m−1·K−1), which was even slightly higher than that of the industrial one.The authors P.L. de Hoyos-Martínez, S. Barriga, E. Corro and J. Labidi disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: Basque Government IT1498-22 and Project ISOLEGUR. D.Y. Wang does not disclose receipt of any financial support for the research, authorship and/or publication of this article

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A portada: Regalos de la VanguardiaForma part del projecte: Biblioteca Digital d'Història de l'Art Hispànic (UAB)Àlbum de la col·lecció 'Regalos de La Vanguardia' als subscriptors que oferia la possibilitat de conservar els dibuixos i escrits de mèrit literari i artístic que el format diari no permetia perdurarÁlbum de la colección 'Regalos de La Vanguardia' a los suscriptores que ofrecía la posibilidad de conservar los dibujos y escritos de mérito literario y artístico que el formato de periódico no permitia perdurarAlbum entitled 'Drawings and notes' offered in the collection 'Regalos de La Vanguardia' to the subscribers of the journal giving the possibility to keep the drawings and writings of literary and artistic value that could not last in the diary forma