Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 182, Issue -, Pages 276-285Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.03.203
Keywords
Lignin; Epoxy resin; Modification; One-pot
Funding
- National Key Research and Development Program of China [2017YFD0601003]
- National Natural Science Foundation of China [51861145103, 21878291]
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A novel strategy was proposed to synthesize phenolated lignin incorporated novolac epoxy networks (PLIENs), which showed preferable mechanical and thermal properties. The research revealed that lignin has a certain promoting effect on the flame retardancy of epoxy resins.
Up to now, various approaches have been used to fabricate lignin-based epoxy thermosets by utilizing lignin or lignin-derivatives, but there is still lack of a simple, effective and environmental-friendly pathway for producing lignin-based epoxy resins from industrial lignin. In this work, a novel strategy - one-pot to synthesize phenolated lignin incorporated novolac epoxy networks (PLIENs) was proposed. As expected, PLIENs obtained from the novel route exhibited preferable mechanical and thermal properties compared with the epoxy resins which obtained from common route. Moreover, increasing the loading of lignin did not significantly deteriorate the thermal-mechanical performance of cured epoxy resins. However, the T-g of PLIENs was slightly lowered compared with conventional petroleum-based epoxy resins (DGEBA). Nonetheless, the flexural strength and storage modulus of PLIENs were higher than that of DGEBA. Especially, the char yield of PLIENs at 800 degrees C was up to 28.9%, much higher than that of DGEBA (only 6.9%), which indicated that lignin has a certain promoting effect on the flame retardancy of epoxy resins. This research provides a new insight for producing commercially viable lignin-based epoxy thermosets. (C) 2021 Published by Elsevier B.V.
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