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Green Chemistry
Page 8 of 29
DOI: 10.1039/C5GC01070E
ARTICLE
Journal Name
zinc standards. Nitrogen was used as the purge gas. The
thermal properties were recorded at 20 °C.min-1 between 20
and 200 °C. Glass transition temperatures (Tg) were
determined as the inflexion point of the heat capacity jump.
Thermo-Gravimetric Analyses (TGA) were performed on a Q50
device from TA Instrument. The samples were heated in an
aluminum crucible from 25°C to 600°C under a nitrogen flow
(60 mL/min). The experiments were carried out at a heating
rate of 10°C/min.
Acknowledgements
The authors would like to thank the French Ministry of
Research for funding this work. The authors are also grateful
to Specific Polymers for providing vanillic acid.
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Vanillin is the only molecular aromatic industrially available
from lignin. The process of vanillin production from lignin
depolymerization gives mixtures of phenolics that are both
economically and environmentally costly to purify. Our
approach aims at using model mixtures of lignin
depolymerization products to by-pass this purification.
Mixtures of phenolics modelling the products obtained from G
and GS lignins depolymerization were prepared with
compositions as realistic as possible. In a first step, these
mixtures and each of their individual components were
subjected to a Dakin oxidation in order to increase their
phenolic functionality. In a second step, the mixtures and their
individual components were glycidylated to obtain mixtures of
epoxy monomers. Epoxy thermosets were prepared from
these epoxy monomers mixtures and heir thermo-mechanical
properties were investigated. In this work, potentially
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adjustment or simply by varying the feedstock. Biomass
variability becomes an industrial asset for fine product tuning
instead of a drawback. In future works, real mixtures of
products from lignin-to-vanillin processes should be used to
prepare epoxy polymers. Intumescent properties of the
materials prepared should also be further investigated. Finally,
the potential of this approach should be further investigated
for other polymers than epoxy polymers.
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