Thiol-Ene Coupling of High Oleic Sunflower Oil towards Application in the Modification of Flexible Polyurethane Foams

Sylwia Dworakowska (1) , Adrien Cornille (2) , Dariusz Bogdal (1) , Bernard Boutevin (2) , Sylvain Caillol (2)

1 Faculty of Chemical Engineering and Technology
2 ICGM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier

High oleic sunflower oil-based polyol was obtained by thiol-ene coupling and applied in the preparation of flexible polyurethane foams. The photochemically initiated thiol-ene click reaction was carried out under UV irradiation using 2-mercaptoethanol. Bio-based polyol with hydroxyl value of 201.4 mg KOH/g was used as 30 wt% substituent of petrochemical polyether polyol in the formulations of flexible foams. Both reference foams, as well as foams modified with bio-based polyol, were formulated to have various isocyanate indices (0.85, 0.95, 1.05). Flexible foams were compared in terms of their thermomechanical properties and analyzed using FT-IR and SEM microscopy. Modification with bio-based polyol resulted in foams with superior compression properties, higher support factor, and lower resilience than reference foams. TGA and FT-IR curves confirmed the presence of urethane/urea and ether linkages in the polyurethane matrix. Moreover, double glass transition temperature corresponding to soft and hard segments of polyurethane was observed by DSC proving the phase-separated morphology.

Mots clés: bio-based polymers; polyurethanes; flexible foam; vegetable oil; thiol-ene coupling

Domaines: Polymères

Sylwia Dworakowska, Adrien Cornille, Dariusz Bogdal, Bernard Boutevin, Sylvain Caillol. Thiol-Ene Coupling of High Oleic Sunflower Oil towards Application in the Modification of Flexible Polyurethane Foams. Materials, 2022, 15, pp.628. ⟨10.3390/ma15020628⟩. ⟨hal-03526702⟩