Chemical structures and molar masses of water-soluble TEMPO-oxidized products prepared from 20 % NaOH-treated cellulose.

TEMPO-catalyzed oxidation is a unique method for converting primary C6-hydroxymethyl groups in water-insoluble regenerated cellulose materials to sodium C6-carboxylate groups in water at room temperature to provide water-soluble polyglucuronates. In this study, 20 % NaOH-treated bacterial cellulose (BC), cotton lint (CL), and ramie cellulose (RC) were oxidized to prepare water-soluble polyglucuronates with high degrees of polymerization and high mass recovery ratios. Solid-state CP/MASS C NMR spectra of the water-soluble products indicated that they contained considerable amounts of C2/C3-ketone hydrate structures (50-60 % of glucuronosyl units).

Can high-molar-mass cellulose molecules be extracted from phosphorylated pulp and TEMPO-oxidized pulps or their nanofibrils using LiCl/DMAc?

Phosphorylated (P-) and TEMPO-oxidized (TO-) wood cellulose fibers (pulps), and P- and TO-cellulose nanofibrils (CNFs) were prepared. To extract pure cellulose molecules, all samples were dispersed in water and freeze-dried, and the P-/TO-pulp and P-/TO-CNF samples were stirred in 8 % (w/w) lithium chloride/N,N-dimethylacetamide (LiCl/DMAc). The quantities of the extracted LiCl/DMAc-soluble fractions and molar-masses of the constituents were determined using size-exclusion chromatography.

Modulating fiber morphology to achieve tunable optical and mechanical properties in bamboo cellulose film.

Transparent cellulose films exhibit tremendous potential for optoelectronic applications due to their exceptional optical/mechanical properties and environmental sustainability. However, the intricate relationship between fiber morphology and film performance remains insufficiently understood, which hampers the precise engineering of film performance for targeted applications. In this study, we present a novel strategy to fabricate transparent cellulose films with tunable optical/mechanical properties by precise morphological manipulation of bamboo fibers.

β-(1 → 4)-Polyglucuronic acids with C2/C3-ketones prepared from regenerated cellulose by catalytic oxidation using solid NaOCl·5HO.

Three commercial regenerated cellulose samples were subjected to TEMPO-catalyzed oxidation using solid NaOCl·5HO as the primary oxidant for structural analyses of the oxidized products (TEMPO = 2,2,6,6-tetramethylpiperidine-1-oxyl). The regenerated cellulose/water slurries became transparent solutions after oxidation for 60 min. The yields of the oxidized products were almost 100 % when they were isolated as precipitates in ethanol/water mixtures.

Structural analyses of supernatant fractions in TEMPO-oxidized pulp/water reaction mixtures separated by centrifugation and dialysis.

Side reactions occurring on cellulose during 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TMEPO)-catalyzed oxidation have not been considered to be significant. Then, TEMPO-oxidized hardwood and softwood bleached kraft pulps (HBKP and SBKP) were prepared with an excess NaOCl·5HO. Supernatant fractions (SFs) were obtained in the aqueous reaction mixtures of TEMPO-oxidized pulps by centrifugation and dialysis.

Correction to "Comprehensive Study of Preparation of Carboxy Group-Containing Cellulose Fibers from Dry-Lap Kraft Pulps by Catalytic Oxidation with Solid NaOCl".

[This corrects the article DOI: 10.1021/acssuschemeng.3c04750.

Polyglucuronic acids prepared from α-(1 → 3)-glucan by TEMPO-catalytic oxidation.

2,2,6,6-Tetramethylpiperidine-1-oxyl radical (TEMPO)-catalytic oxidation was applied to a water-insoluble α-(1 → 3)-glucan in water at pH 10 and room temperature (∼24 °C), with solid NaOCl·5HO as the primary oxidant. Oxidation with NaOCl at 15 mmol/g gave a water-soluble TEMPO-oxidized product at a mass recovery ratio of 97 %. The carboxy content of the TEMPO-oxidized product was 5.

Mechanically robust, flame-retardant phosphorylated cellulose films with tunable optical properties for light management in LEDs.

Biodegradable cellulose films with excellent mechanical, optical, and functional properties have attracted considerable attention as promising alternatives to plastics for photoelectronic devices. In this work, mechanically ductile, flame-retardant cellulose films with tunable optical properties were prepared by simple mechanical disintegration of phosphorylated cellulose (PhC) fibers, vacuum filtration of as-prepared dispersions, and subsequent pressing of the wet PhC films to prepare dried films. When mechanical disintegration conditions were optimized, the resultant PhC films exhibited an average density, tensile strength, Young's modulus, tensile toughness, and folding resistance of 1.

Favorable combination of foldability and toughness of transparent cellulose nanofibril films by a PET fiber-reinforced strategy.

Transparent cellulose nanofibril (CNF) films have been considered a promising sustainable alternative for nonrenewable and nonbiodegradable petroleum-based plastic films. However, their relatively low toughness and poor folding endurance are two remaining challenges for commercial application. In this work, inspired by fiber-reinforced polymer, a transparent CNF film with favorable combination of toughness and folding endurance is demonstrated by a facile and scalable polyethylene terephthalate (PET) fiber-reinforced strategy.

Approaching Theoretical Haze of Highly Transparent All-Cellulose Composite Films.

A highly transparent cellulose film with a high built-in haze is emerging as a green photonic material for optoelectronics. Unfortunately, attaining its theoretical haze still remains a challenge. Here, we demonstrate an all-cellulose composite film with a 90.