RT Journal Article
T1 Impact of acetylation process of kraft lignin in development of  environment-friendly semisolid lubricants
A1 Trejo Cáceres, Manuel
A1 Sánchez Carrillo, María Carmen
A1 Martín Alfonso, José Enrique
AB The aim of this work was to study the influence of the acetylation process of kraft lignin on developing dispersions potentially applicable as new bio-based semisolid lubricants. Lignin was functionalized with acetic anhydride and pyridine as a catalyst by modifying different reaction variables (temperature, ratio of pyridine/acetic anhydride and time). Acetylated lignin was analyzed using FTIR, 1H and 13C NMR techniques, TGA, DSC and SEM to evaluate the chemical, morphological and thermal changes induced by the acetylation process. The influence of the acetylation process on the rheological and tribological properties of dispersions was related to the development of different microstructures, which depend on chemical and morphological properties of acetylated lignin. In this sense, two different rheological behaviours (gel-like or fluid-like) were found to depend on the reaction time. From the experimental results obtained, it can be concluded that the acetylation process is a key issue to modulate rheological and morphological properties of dispersions, resulting in an effective method to improve the compatibility of lignin and castor oil. Acetylated lignin with medium degrees of substitution with adequate morphological properties can be potentially used as an effective thickening agent to develop semisolid lubricants.
PB Elsevier
SN 0141-8130
YR 2023
FD 2023
LK https://hdl.handle.net/10272/23044
UL https://hdl.handle.net/10272/23044
LA eng
NO Trejo-Cáceres, M., Sánchez, M. C., & Martín-Alfonso, J. E. (2023). Impact of acetylation process of kraft lignin in development of environment-friendly semisolid lubricants. In International Journal of Biological Macromolecules (Vol. 227, pp. 673–684). Elsevier BV. https://doi.org/10.1016/j.ijbiomac.2022.12.096
NO This work is part of two research projects, RTI2018-096080-B-C21 and 802C1800001, funded by a Ministerio de Ciencia e Innovación and Junta de Andalucía Spanish programmes, respectively. The authors gratefully acknowledge the financial support.
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026