RT Journal Article
T1 Cellulose Pulp- and Castor Oil-Based Polyurethanes for Lubricating Applications: Influence of Streptomyces Action on Barley and Wheat Straws
A1 Borrero López, Antonio María
A1 Valencia Barragán, Concepción
A1 Blánquez, Alba
A1 Franco Gómez, José María
AB The replacement of mineral oils and non-renewable gelling agents is an imperativerequirement for the lubricant industry in the near future. In this framework, cellulose pulp andcastor oil are proposed as sustainable substitutes for these components. Biological treatment hasbeen explored and evaluated to enhance the dispersing and thickening properties of cellulosepulp in oil media. Streptomyces sp. MDG147 and MDG301 strains were employed to modifyagricultural wheat and barley straw residues from which cellulose pulp was obtained afterwards.In addition, an environmentally friendly process for the production of cellulose-pulp-/castor-oil-basedpolyurethanes was applied, in which neither catalysts nor harmful solvents were used, resulting inchemical oleogels. These oleogels were rheologically and tribologically characterized to evaluate theirperformance as lubricating greases. The enzymatic activity pattern developed was dependent onthe raw material, the strain type, and the temperature, influencing the cellulose pulp’s composition,polymerization degree, and crystallinity. These modified characteristics tuned the rheological behaviorof the different oleogels, providing a beneficial range of viscoelastic responses and viscosity valuesthat were generally favored by the Streptomyces action. Furthermore, the friction coefficient anddimensions of wear scars measured in a tribological contact were comparable to, or even lowerthan, those found with commercial and other bio-based lubricating greases that have previouslybeen studied.
PB MDPI
SN 2073-4360
YR 2020
FD 2020-11
LK http://hdl.handle.net/10272/19136
UL http://hdl.handle.net/10272/19136
LA eng
NO Borrero López, A. M., Valencia Barragán, C., Blánquez, A.,  ...  Franco Gómez, J. M. (2020). Cellulose Pulp- and Castor Oil-Based Polyurethanes for Lubricating Applications: Influence of Streptomyces Action on Barley and Wheat Straws. Polymers, 12(12), 2822. DOI:  https://doi.org/10.3390/polym12122822
DS Repositorio Institucional de la Universidad de Huelva
RD 1 jun 2026