An oxidative depolymerized lignin treated by potassium ferrate and its use in preparation of epoxy resin

Lignin, as an industrial by‐product, can be used as a phenolic substancen. In this study, enzymatic hydrolysis lignin (L) was treated with potassium ferrate and phenol respectively to obtain oxidized lignin (OL) and phenolated lignin (PL). Their phenolic hydroxyl content (PhOH) increased by 29.1% an...

Full description

Saved in:
Bibliographic Details
Published in:Journal of applied polymer science 2025-01, Vol.142 (3), p.n/a
Main Authors: Shi, Decai, Chen, Fangeng, Zhou, Xuesong, Ke, Qiaomei, Huang, Jinting, Lin, Yaonan, Du, Ningning
Format: Article
Language:English
Subjects:
biopolymers and renewable polymers
cellulose and other wood products
Crosslinking
Depolymerization
Dynamic mechanical analysis
Epoxy resins
Fourier transforms
Gel chromatography
Infrared analysis
Lignin
Mechanical properties
Oxidation
Potassium
Potassium ferrate
resins
Shear strength
Tensile strength
Thermal stability
Thermogravimetric analysis
thermosets
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Lignin, as an industrial by‐product, can be used as a phenolic substancen. In this study, enzymatic hydrolysis lignin (L) was treated with potassium ferrate and phenol respectively to obtain oxidized lignin (OL) and phenolated lignin (PL). Their phenolic hydroxyl content (PhOH) increased by 29.1% and 40.5%, respectively. Then four kinds of epoxy resins were prepared, namely lignin‐free epoxy resin (LFER), L epoxy resin (LER), PL epoxy resin (PLER), and OL epoxy resin (OLER). Gel permeation chromatography (GPC) and Fourier transform infrared analyses indicated that potassium ferrate oxidation could decline the molecular weight (Mw) and increase the PhOH of L. Mechanical properties test and dynamic mechanical analysis (DMA) results show that cured OLER (OLEN) has higher crosslinking density and better mechanical properties (shear strength increased by 14%, tensile strength increased by 15%) than cured LER (LEN). Thermogravimetric analysis results show that OLEN has better thermal stability than cured LFER (LFEN) and LEN. In addition, scanning electron microscopy images showed that the modified L had better compatibility. This study presents a novel approach for lignin oxidation. Epoxidation and characterization of modified EHL.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.56368