Cross-linking of polyesters based on fatty acids

Sylwia Dworakowska , Cédric Le Coz (1) , Guillaume Chollet (2) , Etienne Grau (1, 3) , Henri Cramail (4, 3)

1 LCPO - Laboratoire de Chimie des Polymères Organiques
2 Lipochimie Hall Industriel
3 Team 2 LCPO : Biopolymers & Bio-sourced Polymers
4 LCPO - Laboratoire de Chimie des polymères organiques

This paper aimed at obtaining cross-linked polymeric materials of biomass origin. For this purpose one-pot polyesterification of methyl ricinoleate and methyl 12-hydroxystearate using titanium isopropoxide as a catalyst has been performed leading to polyesters known as estolides. The obtained estolides were successfully cross-linked using dicumyl peroxide or a sulfur vulcanization system. The so-formed bio-based elastomers appeared to exhibit promising properties. The latter were analyzed by mechanical tensile tests and thermal techniques (TGA, DSC, DMA) and showed high thermal stability (T5% = 205-318 °C) and tailored physico-mechanical properties (low glass transition temperature in the range from-2 69 to-54 °C) and good tensile strength (0.11-0.40 MPa). Networks prepared from high molecular weight estolides appear to be promising bio-based elastomers. Practical applications : The vegetable oil-based estolides described in this contribution, are new fully bio-based precursors for further elastomers synthesis. The resulting estolide networks (obtained by peroxide or sulfur cross-linking) exhibit tailored thermo-mechanical properties.

Mots clés: polycondensation; polyesters; estolides

Domaines: Matériaux; Polymères; Science des matériaux [cond-mat.mtrl-sci]

Sylwia Dworakowska, Cédric Le Coz, Guillaume Chollet, Etienne Grau, Henri Cramail. Cross-linking of polyesters based on fatty acids. European Journal of Lipid Science and Technology, 2019, 121 (11), pp.1900264. ⟨10.1002/ejlt.201900264⟩. ⟨hal-02366943⟩