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Title: Controlled Dispersion and Setting of Cellulose Nanofibril - Carboxymethyl Cellulose Pastes

Source: Cellulose journal

Author(s)Azrak, Sami M. El Awad; Gohl, Jared A.; Moon, Robert J.; Schueneman, Gregory T.; Davis, Chelsea S.; Youngblood, Jeffrey P.

Publication Year: 2021  View PDF »

Category: Journal Articles

Abstract: This work investigated the redispersion and setting behavior of highly loaded (∼ 18 wt.% solids in water) pastes of cellulose nanofibrils (CNFs) with carboxymethyl cellulose (CMC). A single-screw extruder was used to continuously process CNF + CMC pastes into cord. The adsorption of CMC onto the CNFs was assessed through zeta potential and titration which revealed a surface charge change of ∼ 61% from - 36.8 mV and 0.094 mmol/g COOH for pure CNF to -58.1 mV and 0.166 mmol/g COOH for CNF + CMC with a CMC degree of substitution of 0.9. Dried CNFs with adsorbed CMC was found to be fully redispersible in water and re-extruded back into a cord without any difficulties. On the other hand, chemical treatment with hydrochloric acid, a carbodiimide crosslinker, or two wet strength enhancers (polyamide epichlorohydrin and polyamine epichlorohydrin) completely suppressed the dispersibility previously observed for dried-untreated CNF + CMC. Turbidity was used to quantify the level of redispersion or setting achieved by the untreated and chemically treated CNF + CMC in both water and a strong alkaline solution (0.1 M NaOH). Depending on the chemical treatment used, FTIR analysis revealed the presence of ester, N-acyl urea, and anhydride absorption bands which were attributed to newly formed linkages between CNFs, possibly explaining the suppressed redispersion behavior. Water uptake of the differently treated and dried CNF + CMC materials agreed with both turbidity and FTIR results.

Keywords: Cellulose nanofibrils; carboxymethyl cellulose; carbodiimide; polyamide epichlorohydrin; polyamine epichlorohydrin; redispersion

Publication Review Process: Formally Refereed

File size: 4,096 kb(s)

Date posted: 01/24/2022

This publication is also viewable on Treesearch:  view
RITS Product ID: 10418
Current FPL Scientists associated with this product (listed alphabetically)
Moon, Robert J.
Materials Research Engineer
Schueneman, Gregory
Supervisory Research Materials Engineer
 

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