期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 9, 期 31, 页码 10503-10512出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.1c02166
关键词
epoxidized castor oil; sugarcane bagasse waste; rheology; intrinsic viscosity; molecular weight
资金
- MICINN-FEDER I+D+i Spanish Programme [RTI2018-096080-BC21]
The study investigated the viscous flow properties of epoxidized castor oil by adjusting the epoxidation degree through altering reaction conditions, and modified the rheological properties with a lignin-enriched fraction from sugarcane bagasse waste. Oil thickening was achieved by promoting cross-linking between the epoxidized oil and lignin-enriched fraction, resulting in various rheological responses from Newtonian liquids to viscoelastic liquids.
Thickening vegetable oils to different extents is of great interest in the design and development of new bio-based lubricant formulations, as achieving a wide range of rheological properties is crucial to the successful replacement of petroleum-based traditional counterparts. With this aim, the influence of epoxidation degree, modified by altering the reaction conditions, on the viscous flow properties of epoxidized castor oil was investigated together with the incorporation of a lignin-enriched fraction from sugarcane bagasse waste to more extensively modify the rheological properties, thereby valorizing this waste fraction. Oil thickening was achieved by promoting the cross-linking between the epoxidized oil and the lignin-enriched fraction that enables the compatibilization of both components. Castor oil epoxidation was assessed by means of standard volumetric titration methods and infrared spectroscopy. In addition, a fully rheological characterization of both epoxidized and lignin-thickened castor oils was carried out. A hydrodynamic approach was also followed, aiming to provide an estimation of the Mark-Houwink-Sakurada parameters and relate the intrinsic viscosity with the average molecular weight of the resulting epoxidized castor oil/lignocellulose macromolecular compounds. The chemical interaction between castor oil and the lignocellulosic material increased as the extent of epoxidation was increased, yielding a variety of rheological responses from Newtonian liquids of increasing viscosities (from around 1 to 500 Pa.s) to viscoelastic liquids.
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