Rheology of epoxidized cellulose pulp gel-like dispersions in castor oil: Influence of epoxidation degree and the epoxide chemical structure

Cortés-Triviño, E.; Valencia, C.; Delgado, Miguel; Franco, J.M.

doi:10.1016/j.carbpol.2018.07.058

Cited by 23 publications

(17 citation statements)

References 53 publications

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“…Oil structuring can be achieved physically, by reducing the polymer polarity, thus modifying the solvent-biopolymer hydrophobic interactions, for example by inserting methyl, ethyl or acyl groups into their structure, or chemically, by functionalization with reactive groups able to produce covalent interactions with the oil, thus promoting a certain degree of cross-linking between the medium and the biopolymer. These routes have been widely reported to produce oleogels and stable gel-like dispersions using different lignocellulosic materials and cellulose or chitosan derivatives [13,[22][23][24][25][26][27][28][29][30]. Nevertheless, these chemical modifications may require chemicals, solvents and/or catalysts that make the process of oil structuring relatively complex and not completely environmentally friendly, even though the final product is.…”

Section: Introductionmentioning

confidence: 99%

Electrospun lignin-PVP nanofibers and their ability for structuring oil

Borrego¹,

Martín‐Alfonso²,

Sánchez³

et al. 2021

International Journal of Biological Macromolecules

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Section: Introductionmentioning

confidence: 99%

Electrospun lignin-PVP nanofibers and their ability for structuring oil

Borrego¹,

Martín‐Alfonso²,

Sánchez³

et al. 2021

International Journal of Biological Macromolecules

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“…The case of lubricating greases remains especially appealing, as, regardless of the extensive work found in literature, the industry continues to employ almost entirely petroleum-based products and uses lithium- and other metal-based soaps as thickening agents. Hence, studies that explore the use of cellulose pulp as a thickener can be found [ 130 , 131 , 132 ], but also pristine cellulose [ 133 , 134 ] and cellulose derivatives [ 133 , 134 , 135 ]. A wide range of these systems has been demonstrated to impart suitable rheological and excellent tribological properties, along with appropriate mechanical stability comparable to lithium-based lubricating grease benchmarks.…”

Section: Lignocellulosic Materials For the Production Of Biofuels Bio...mentioning

confidence: 99%

Lignocellulosic Materials for the Production of Biofuels, Biochemicals and Biomaterials and Applications of Lignocellulose-Based Polyurethanes: A Review

2022

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The present review is devoted to the description of the state-of-the-art techniques and procedures concerning treatments and modifications of lignocellulosic materials in order to use them as precursors for biomaterials, biochemicals and biofuels, with particular focus on lignin and lignin-based products. Four different main pretreatment types are outlined, i.e., thermal, mechanical, chemical and biological, with special emphasis on the biological action of fungi and bacteria. Therefore, by selecting a determined type of fungi or bacteria, some of the fractions may remain unaltered, while others may be decomposed. In this sense, the possibilities to obtain different final products are massive, depending on the type of microorganism and the biomass selected. Biofuels, biochemicals and biomaterials derived from lignocellulose are extensively described, covering those obtained from the lignocellulose as a whole, but also from the main biopolymers that comprise its structure, i.e., cellulose, hemicellulose and lignin. In addition, special attention has been paid to the formulation of bio-polyurethanes from lignocellulosic materials, focusing more specifically on their applications in the lubricant, adhesive and cushioning material fields. High-performance alternatives to petroleum-derived products have been reported, such as adhesives that substantially exceed the adhesion performance of those commercially available in different surfaces, lubricating greases with tribological behaviour superior to those in lithium and calcium soap and elastomers with excellent static and dynamic performance.

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“…17,18 Specifically, the nucleophilic attack of these hydroxyl groups on epoxy rings can be emphasized, which may give rise to more structured cross-linked networks. In previous studies, 19,20 different lignocellulosic fractions were functionalized with several epoxy compounds and further dispersed in vegetable oils resulting in chemical gels with potential applications as bio-based lubricating greases. An opposite approach can also be followed by inducing the epoxidation of a vegetable oil and then adding the lignocellulosic material as a viscosity modifier of the oil medium.…”

Section: ■ Introductionmentioning

confidence: 99%

Thickening Castor Oil with a Lignin-Enriched Fraction from Sugarcane Bagasse Waste via Epoxidation: A Rheological and Hydrodynamic Approach

Cortés-Triviño

Valencia

Franco

2021

ACS Sustainable Chem. Eng.

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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 petroleumbased 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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Rheology of epoxidized cellulose pulp gel-like dispersions in castor oil: Influence of epoxidation degree and the epoxide chemical structure

Cited by 23 publications

References 53 publications

Electrospun lignin-PVP nanofibers and their ability for structuring oil

Electrospun lignin-PVP nanofibers and their ability for structuring oil

Lignocellulosic Materials for the Production of Biofuels, Biochemicals and Biomaterials and Applications of Lignocellulose-Based Polyurethanes: A Review

Thickening Castor Oil with a Lignin-Enriched Fraction from Sugarcane Bagasse Waste via Epoxidation: A Rheological and Hydrodynamic Approach

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