Communication Dans Un Congrès Année : 2025

Flexible polyhydroxyurethane foams from highly reactive formulations based on carbonated hemp oil

Résumé

Polyurethanes (PUs) are thermosetting materials mainly used in the form of rigid or flexible foams, with a prominent place in construction, transport, and consumer goods industries. Due to their negative health and environmental impacts, conventional PUs are subject to severe regulatory restrictions under the REACH regulation. The substitution of PUs with more sustainable non-isocyanate polyurethanes (NIPUs) is therefore of great interest. Nevertheless, because of their lower reactivity, the curing times of NIPU foams are currently incompatible with the industrial production rates of PU foams, and therefore must be optimised. In this context, the present work aims at developing new flexible biobased NIPU foams with optimised reactivity, and with equivalent thermal and mechanical properties to standard PU foams. New two-component resins with a high content of renewable materials (>90 wt%) were synthesised from biobased diamines and modified hemp oil, for the production of a wide range of polyhydroxyurethane (PHU) foams. Using an in situ NMR spectroscopy methodology, the influence of the catalyst concentration and nature, and of the reaction temperature, was first highlighted [1]. Using rheometry, very interesting curing times (5 min at 80 °C) were obtained by adjusting the residual epoxy content in the carbonated oil, the amine nature and concentrations, as well as the catalysis conditions. After optimising the expansion method, PHU foams with a glass transition temperature of -25 °C, a density lower than 150 kg.m-3, and a compression set lower than 1 %, were developed, in line with industrial PU specifications.

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Dates et versions

cea-05195066 , version 1 (31-07-2025)

Identifiants

  • HAL Id : cea-05195066 , version 1

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Sébastien Rolere, Anthony Monmagnon, Pierre-Alain Bayle, Renaud Demadrille. Flexible polyhydroxyurethane foams from highly reactive formulations based on carbonated hemp oil. EPF 2025, Jun 2025, Groningen, Netherlands. ⟨cea-05195066⟩
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