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Preparation of methylated TEMPO-oxidized cellulose nanofibril hydrogel with high-temperature sensitivity

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Abstract

TEMPO-oxidized cellulose nanofibril (TOCNF) hydrogel presents unique advantageous characteristics and has been envisioned as a building block to design novel biobased materials. However, the failure to maintain the gel shape and rapid decline of viscosity at elevated temperature (> 120 °C) limit the application of TOCNF hydrogel in high temperature environment of oil fields. In this study, dimethyl carbonate (DMC), a green methylation reagent, was employed to introduce methyl groups into TOCNFs to endow the DMC-TOCNF hydrogel with improved resistance at higher temperatures. The DMC-TOCNFs and original TOCNFs were characterized by fourier transform infrared (FTIR), X-ray photoelectron spectroscopy, atomic force microscopy, thermogravimetric analysis and rheological tests. The results show that the degree of substitution of DMC-TOCNFs was 0.078, 0.390 and 0.630, respectively. DMC-TOCNFs displayed the characteristics of gelation at high temperature, which increased with higher degree of substitution (DS). Of particular importance, the viscosity of DMC-TOCNFs dramatically raised from 226 to 2.9 × 104 mPa s when the temperature rose from 30 to 160 °C at a DS of 0.630. The methylated-TOCNF hydrogels displayed great potentials in expanding the application of TOCNFs at high temperatures.

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Acknowledgments

The authors are grateful for the financial support from the Natural Science Foundation of Tianjin, China (Grant No. 181CYBIC86500).

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Correspondence to Zheng Fang or Yangbing Wen.

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Luo, L., Fang, Z., Zhang, W. et al. Preparation of methylated TEMPO-oxidized cellulose nanofibril hydrogel with high-temperature sensitivity. Cellulose 29, 8599–8609 (2022). https://doi.org/10.1007/s10570-022-04811-3

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  • DOI: https://doi.org/10.1007/s10570-022-04811-3

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