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Article Dans Une Revue ACS Sustainable Chemistry & Engineering Année : 2019

Toward Sustainable Phenolic Thermosets with High Thermal Performances

Résumé

This paper proposes more sustainable alternatives for the synthesis of high thermal performances phenolic networks. Terephthalaldehyde (TPA), a nontoxic aromatic dialdehyde, was selected to replace formaldehyde. Phenol was, in turns, replaced with biobased and nontoxic phenolic building blocks: resorcinol as a model for tannins, guaiacol which is easily accessible from lignin, and tyrosol from olive oil mill wastewaters. The prepolymerization was performed under mild conditions (ethanol, T ≤ 100 °C). The liquid prepolymers were characterized by NMR, IR, MALDI-ToF, and rheology. The curing behavior of these formulations was assessed by DSC and IR spectroscopy. An advanced isoconversional analysis of the DSC data allowed for the determination of cross-linking activation energies. Furthermore, a multistep mechanism of TPA cross-linking was proposed with strong evidence. The thermo-mechanical properties of cured networks were characterized using DMA, showing high cross-link densities and glass transition temperatures. Finally, these new thermosets displayed very high thermal performances under pyrolysis conditions (TGA).

Domaines

Polymères
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Dates et versions

hal-02088453 , version 1 (15-05-2020)

Identifiants

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Lérys Granado, Romain Tavernier, Ségolène Henry, Ruth Oye Auke, Gabriel Foyer, et al.. Toward Sustainable Phenolic Thermosets with High Thermal Performances. ACS Sustainable Chemistry & Engineering, 2019, 7 (7), pp.7209-7217. ⟨10.1021/acssuschemeng.8b06286⟩. ⟨hal-02088453⟩
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