TY - JOUR
T1 - Thermal Properties of Ethanol Organosolv Lignin Depending on Its Structure
AU - Choi, June Ho
AU - Cho, Seong Min
AU - Kim, Jong Chan
AU - Park, Sang Woo
AU - Cho, Young Min
AU - Koo, Bonwook
AU - Kwak, Hyo Won
AU - Choi, In Gyu
N1 - Publisher Copyright:
© 2021 The Authors. Published by American Chemical Society.
PY - 2021/1/19
Y1 - 2021/1/19
N2 - In general, lignin exhibits unpredictable and nonuniform thermal properties due to the structural variations caused by the extraction processes. Therefore, a systematic understanding of the correlation between the extraction conditions, structural characteristics, and properties is indispensable for the commercial utilization of lignin. In this study, the effect of extraction conditions on the structural characteristics of ethanol organosolv lignin (EOL) was investigated by response surface methodology. The structural characteristics of EOL (molecular weight, hydroxyl content, and intramolecular coupling structure) were significantly affected by the extraction conditions (temperature, sulfuric acid concentration, and ethanol concentration). In addition, the correlation between the structural characteristics and thermal properties of the extracted EOLs was estimated. The relevant correlations between the structural characteristics and thermal properties were determined. In particular, EOLs that had a low molecular weight, high phenolic hydroxyl content, and low aryl-ether linkage content exhibited prominent thermal properties in terms of their initial decomposition rate and a high glass transition temperature, Tg. Correspondingly, EOL-PLA blends prepared using three EOL types exhibited improved thermal properties (starting point of thermal decomposition and maximum decomposition temperature) compared to neat PLA and had thermal decomposition behaviors coincident with the thermal properties of the constituent EOLs.
AB - In general, lignin exhibits unpredictable and nonuniform thermal properties due to the structural variations caused by the extraction processes. Therefore, a systematic understanding of the correlation between the extraction conditions, structural characteristics, and properties is indispensable for the commercial utilization of lignin. In this study, the effect of extraction conditions on the structural characteristics of ethanol organosolv lignin (EOL) was investigated by response surface methodology. The structural characteristics of EOL (molecular weight, hydroxyl content, and intramolecular coupling structure) were significantly affected by the extraction conditions (temperature, sulfuric acid concentration, and ethanol concentration). In addition, the correlation between the structural characteristics and thermal properties of the extracted EOLs was estimated. The relevant correlations between the structural characteristics and thermal properties were determined. In particular, EOLs that had a low molecular weight, high phenolic hydroxyl content, and low aryl-ether linkage content exhibited prominent thermal properties in terms of their initial decomposition rate and a high glass transition temperature, Tg. Correspondingly, EOL-PLA blends prepared using three EOL types exhibited improved thermal properties (starting point of thermal decomposition and maximum decomposition temperature) compared to neat PLA and had thermal decomposition behaviors coincident with the thermal properties of the constituent EOLs.
UR - http://www.scopus.com/inward/record.url?scp=85099762701&partnerID=8YFLogxK
U2 - 10.1021/acsomega.0c05234
DO - 10.1021/acsomega.0c05234
M3 - Article
AN - SCOPUS:85099762701
SN - 2470-1343
VL - 6
SP - 1534
EP - 1546
JO - ACS Omega
JF - ACS Omega
IS - 2
ER -