Evaluation of Ligno Boost (TM) softwood kraft lignin epoxidation as an approach for its application in cured epoxy resins


In this study, modification of LignoBoost (TM) softwood kraft lignin with epichlorhydrin in water-organic solvents media was realized. Lignin-based epoxy resins were obtained by two ways: acetone extraction of glycidylated lignin or glycidylation of the acetone soluble lignin fraction. The effect of glycidylation regimes on the yields of acetone soluble fractions, their functional composition and physical-chemical characteristics was investigated using wet chemistry methods, FTIR spectroscopy, size exclusion chromatography (SEC) and differential scanning calorimetry (DSC). The positive effect of the biphasic phase transfer catalytic system - KOH/quaternary ammonium salt on glycidylation of both phenolic and aliphatic hydroxyl groups was testified, exemplified using a lignin-like model compound 4-hydroxy-3-methoxylbenzyl alcohol (vanillyl alcohol). The partial substitution (up to 10%) of commercial epoxy resin on the basis of bisphenol A (Araldite. LY1564) by lignin-based epoxy resin significantly increased the viscosity of resin. Therefore, the possible practical application of lignin-containing epoxies as adhesive, mastic or crack filler instead of binder for fiber reinforced composites was considered. A tendency towards increasing Young's modulus of cured lignin-containing epoxies, compared with the case of the reference composition, was observed. The lignin chemically incorporated into the matrix of cured commercial epoxy resin acts as a charcoal formation promoter in high temperature treatment.



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Jablonskis, A; Arshanitsa, A; Arnautov, A; Telysheva, G; Evtuguin, D

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The financial support from the Collaborative European project US4GREENCHEM, Grant Agreement Number 669055 is gratefully acknowledged.

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