Properties of Cellulosic Material after Cationization in Different Solvents

Abstract

Fibers resulting from pulping of wood are negatively charged by nature. Both the cellulose and hemicelluloses contribute to the anionicity. The negative charge of cellulosic material can be reversed with the same reagent commonly used for the cationization of starch. In this study, a bleached Kraft pulp was cationized in systems with different water-miscible organic solvents. Replacing 90% of the water with isopropanol and particularly with tetrahydrofuran yielded higher degrees of substitution and increased reaction efficiency. The degree of substitution depends on the concentration of the cationization reagent in water; partially replacing water with tetrahydrofuran can simulate a higher concentration while maintaining supramolecular properties, such as crystallinity and polymer chain integrity.

Transparent lignin-containing wood nanofiber films with UV-blocking, oxygen barrier, and anti-microbial properties

“…34 Other solvents have also been studied to minimize the epoxide ring opening reaction with water, which consumes the reagent and decreases the reaction efficiency. 35,36 Depending on the reaction conditions (e.g. solvent content, time, and temperature), CNFs with charge densities of 0.…”

Comparative study of historical woods from XIX century by thermogravimetry coupled with FTIR spectroscopy

“…2900 cm 1 , which is due to asymmetric and symmetric CH stretching (Collier et al 1997;Schwanninger et al 2004). Generally, the absorption intensity at 2900 cm -1 is used as internal standard for determination of the cellulose structural degree in wooden samples (Poletto et al 2014;Odabas et al 2016).…”

Synthesis and Application of Cationised Cellulose for Removal of Cr(VI) from Acid Mine-Drainage Contaminated Water

“…Dried cellulose was cationised according to the procedure described by Odabas and colleagues (Odabas et al, 2016). Briefly, 5 g of cellulose fibres were added to 225 mL THF in a two-necked round-bottom flask equipped with a condenser, and stirred for 1 hour at ambient temperature (21 ± 2 ℃).…”

“…Because side reactions are promoted by the presence of water (Zaman et al, 2012), THF was used as a solvent. Odabas et al (Odabas et al, 2016) showed that THF plays a "spectator" role, having little if any influence on the cationisation reaction.…”