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Chemical modification of methyl cellulose with HMDI to modulate the thickening properties in castor oil

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Abstract

This work deals with the selective incorporation of reactive isocyanate groups into methyl cellulose in order to be used as reactive thickening agent in castor oil. Resulting gel-like dispersions may have potential applications as green lubricating greases formulated from renewable resources. Two different isocyanate-functionalized methyl cellulose-based polymers were obtained by reaction of methyl cellulose with 1,6-hexamethylene diisocyanate. The functionalization degree, from fully functionalized to a certain number of free hydroxyl groups (58:36:6 ratio between –OMe, –NCO and free –OH groups), was controlled by modifying the reagents molar ratio. These polymers were characterized through nuclear magnetic resonance of protons (1H-NMR), Fourier transform infrared spectroscopy and thermogravimetric analysis (TGA). Thermal and rheological responses of oleogels prepared by dispersing these polymers in castor oil were studied by means of TGA analysis and small-amplitude oscillatory shear measurements. The evolution of linear viscoelasticity functions with frequency of the oleogel containing isocyanate-functionalized methyl cellulose with lower –NCO content is quite similar to that found for traditional lithium lubricating greases. In relation to long-term stability of these oleogels, the values of viscoelastic functions significantly increase during the first 7 days of ageing and then remain almost constant.

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Acknowledgments

This work is part of a research project (CTQ2010–15338) sponsored by a MINECO-FEDER Programme. One of the authors (R. Gallego) has received a Ph.D. Research Grant from the “Ministerio de Ciencia e Innovación”. The authors gratefully acknowledge its financial support.

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Authors and Affiliations

  1. Departamento de Ingeniería Química, Química Física y Química Orgánica, Universidad de Huelva, Campus de “El Carmen”, Campus de Excelencia Internacional Agroalimentario, ceiA3, 21071, Huelva, Spain

    R. Gallego, J. F. Arteaga, C. Valencia & J. M. Franco

  2. PRO2TEC, Chemical Process and Product Technology Research Center, Universidad de Huelva, 21071, Huelva, Spain

    C. Valencia & J. M. Franco

Authors
  1. R. Gallego
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  2. J. F. Arteaga
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  3. C. Valencia
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  4. J. M. Franco
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Correspondence to J. M. Franco.

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Gallego, R., Arteaga, J.F., Valencia, C. et al. Chemical modification of methyl cellulose with HMDI to modulate the thickening properties in castor oil. Cellulose 20, 495–507 (2013). https://doi.org/10.1007/s10570-012-9803-4

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  • DOI: https://doi.org/10.1007/s10570-012-9803-4

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