Epoxy resin synthesis using low molecular weight lignin separated from various lignocellulosic materials

A low molecular weight lignin from various lignocellulosic materials was used for the synthesis of bio-based epoxy resins. The lignin extracted with methanol from steam-exploded samples (steaming time of 5min at steam pressure of 3.5MPa) from different biomasses (i.e., cedar, eucalyptus, and bamboo)...

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Bibliographic Details
Published in:International journal of biological macromolecules 2015-03, Vol.74, p.413-419
Main Authors: Asada, Chikako, Basnet, Sunita, Otsuka, Masaya, Sasaki, Chizuru, Nakamura, Yoshitoshi
Format: Article
Language:English
Subjects:
Biomass
Epoxy Resins - chemical synthesis
Epoxy Resins - chemistry
Lignin - chemistry
Lignin epoxy resin
Lignocellulosic material
Low molecular weight lignin
Methanol
Molecular Weight
Nuclear Magnetic Resonance, Biomolecular
Plants - chemistry
Solubility
Solvents
Thermodynamics
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Summary:A low molecular weight lignin from various lignocellulosic materials was used for the synthesis of bio-based epoxy resins. The lignin extracted with methanol from steam-exploded samples (steaming time of 5min at steam pressure of 3.5MPa) from different biomasses (i.e., cedar, eucalyptus, and bamboo) were functionalized by the reaction with epichlorohydrin, catalyzed by a water-soluble phase transfer catalyst tetramethylammonium chloride, which was further reacted with 30wt% aqueous NaOH for ring closure using methyl ethyl ketone as a solvent. The glycidylated products of the lignin with good yields were cured to epoxy polymer networks with bio-based curing agents i.e., lignin itself and a commercial curing agent TD2131. Relatively good thermal properties of the bio-based epoxy network was obtained and thermal decomposition temperature at 5% weight loss (Td5) of cedar-derived epoxy resin was higher than that derived from eucalyptus and bamboo. The bio-based resin satisfies the stability requirement of epoxy resin applicable for electric circuit boards. The methanol-insoluble residues were enzymatically hydrolyzed to produce glucose. This study indicated that the biomass-derived methanol-soluble lignin may be a promising candidate to be used as a substitute for petroleum-based epoxy resin derived from bisphenol A, while insoluble residues may be processed to give a bioethanol precursor i.e., glucose.
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2014.12.039