Article Dans Une Revue ACS Sustainable Chemistry & Engineering Année : 2025

Fast Curing of a Biobased Polyhydroxyurethane Thermoset Using Near-Infrared Photothermal Effect

Résumé

Polyhydroxyurethanes (PHU), which are obtained by the reaction of cyclocarbonates and amines, represent an eco-friendly alternative to conventional polyurethanes because their synthesis relies on CO2-based precursors, avoids the use of toxic isocyanates, and allows introducing additional functionalities (“hydroxy”) in the polymer backbone. However, the low reactivity of the cyclocarbonates’ aminolysis to form polyhydroxyurethane represents a major drawback, particularly for industrialization. To overcome this lack of reactivity, through this study we propose the use of the photothermal effect generated by the organic heater 2-chloro-3-[2-(1,1,3-trimethylbenz[e]indolin-2-ylidene)ethylidene]-1-[2-(1,1,3-trimethylbenz[e]indolium-2-yl)vinyl]cyclohexene p-toluenesulfonate (IR-813 p-toluenesulfonate) absorbing in the near-infrared (NIR) region. IR-813 was chosen because of its commercial availability and its good solubility in organic resins and REACH-registered behavior. It was added to a formulation composed of trimethylolpropane tricarbonate (TMPTC) and 1,5-pentanediamine, the curing of which under NIR light (850 nm) was subsequently studied. Various parameters were varied, such as the amount of IR-813 “heater” and the irradiance of the light-emitting diode (LED) source, and their influence on gel time and maximum reached temperature were evaluated. The best system allowed reaching a temperature of 150 °C, a gel time of 3 min, and a gel content of 94%, using only the light generated by the NIR light-emitting diode (LED) as external energy source. Finally, the energetic costs associated with LED curing were compared with those of conventional thermal curing. By providing an energy savings of 36%, photothermal curing using LED proved to be a more sustainable alternative than conventional thermal curing using ovens.

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hal-05035752 , version 1 (15-04-2025)

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Philibert Lenormand, Rania Rejeb, Patrick Lacroix-Desmazes, Sylvain Caillol, Michael Schmitt, et al.. Fast Curing of a Biobased Polyhydroxyurethane Thermoset Using Near-Infrared Photothermal Effect. ACS Sustainable Chemistry & Engineering, 2025, 13 (11), pp.4308-4318. ⟨10.1021/acssuschemeng.4c04946⟩. ⟨hal-05035752⟩
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