Epoxy Vitrimer Materials by Lipase-Catalyzed Network Formation and Exchange Reactions - Archive ouverte HAL Access content directly
Journal Articles ACS Macro Letters Year : 2023

Epoxy Vitrimer Materials by Lipase-Catalyzed Network Formation and Exchange Reactions

Abstract

The preparation and reprocessing of an epoxy vitrimer material is performed in a fully biocatalyzed process wherein network formation and exchange reactions are promoted by a lipase enzyme. Binary phase diagrams are introduced to select suitable diacid/diepoxide monomer compositions overcoming the limitations (phase separation/sedimentation) imposed by curing temperature inferior than 100 °C, to protect the enzyme. The ability of lipase TL, embedded in the chemical network, to catalyze efficiently exchange reactions (transesterification) is demonstrated by combining multiple stress relaxation experiments at 70–100 °C and complete recovery of mechanical strength after several reprocessing assays (up to 3 times). Complete stress relaxation ability disappears after heating at 150 °C, due to enzyme denaturation. Transesterification vitrimers thus designed are complementary to those involving classical catalysis (e.g., using the organocatalyst triazabicyclodecene) for which complete stress relaxation is possible only at high temperature.
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Dates and versions

hal-04060224 , version 1 (07-07-2023)

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Camille Bakkali-Hassani, Paolo Edera, Jakob Langenbach, Quentin-Arthur Poutrel, Sophie Norvez, et al.. Epoxy Vitrimer Materials by Lipase-Catalyzed Network Formation and Exchange Reactions. ACS Macro Letters, 2023, 12 (3), pp.338-343. ⟨10.1021/acsmacrolett.2c00715⟩. ⟨hal-04060224⟩
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