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A rheological study of cationic micro- and nanofibrillated cellulose: quaternization reaction optimization and fibril characteristic effects

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Abstract

Driven by the demand for various cationic biopolymers in recent years, the quaternization of cellulose nanofibers was carefully investigated to have tight control over their final characteristics. The addition of sodium hydroxide (NaOH) to the reaction mixture is crucial as it catalyzes the conversion of alcohol groups of cellulose into more reactive alcoholate groups. On the other hand, excessive concentration proves to inhibit the reactivity of hydroxyl groups. The addition of glycidyltrimethylammonium chloride (GTMAC) increases the yield of the trimethylammonium chloride content (TMAC) reaction, while in excess it affects the rheological properties of the quaternizated cellulose nanofibers. The effects of NaOH and GTMAC on the TMAC content and rheological properties have been investigated in detail and mathematically evaluated. Furthermore, a comparison of the viscoelastic behavior and shear thinning character of commercial cationic micro- and nanofibrillated cellulose is presented. The research allows to extend the possibility of using cellulose in many applications of cationic biopolymers.

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Acknowledgment

The authors acknowledge the financial support from the Slovenian Research Agency (research core funding No. P2-0191).

Funding

This work was supported by Slovenian Research Agency (Grant No. P2-0191).

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Conceptualization: Tilen Kopač, Aleš Ručigaj; Methodology: Tilen Kopač; Formal analysis and investigation: Tilen Kopač, Aleš Ručigaj; Visualization: Tilen Kopač; Writing – original draft preparation: Tilen Kopač; Writing – review and editing: Matjaž Krajnc, Aleš Ručigaj; Funding acquisition: Matjaž Krajnc; Resources: Matjaž Krajnc; Supervision: Aleš Ručigaj.

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Correspondence to Aleš Ručigaj.

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Authors declare no humans and/or animals were involved in this study.

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Kopač, T., Krajnc, M. & Ručigaj, A. A rheological study of cationic micro- and nanofibrillated cellulose: quaternization reaction optimization and fibril characteristic effects. Cellulose 29, 1435–1450 (2022). https://doi.org/10.1007/s10570-021-04365-w

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  • DOI: https://doi.org/10.1007/s10570-021-04365-w

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