Preparation and characterization of cellulose carbamate membrane with high strength and transparency

Abstract

In this study, cellulose carbamate was synthesized from alkali cellulose and urea by a low‐cost solid–liquid phase method. Cellulose carbamate was dissolved in cuprammonium solution to form a regenerated cellulose membrane with high strength and high transparency. The mass fraction of cellulose dissolved was greatly increased (up to 17%), and the thermal stability of cellulose was retained. The surface of the membrane is compact and there are regular microchannels in it. The factors influencing the transparency and mechanical properties of regenerated cellulose membrane were discussed by the range analysis of orthogonal experiment. The light transmittance is 95.50%, the breaking strength is 98.35 MPa, the elongation at break is 21.74%. The ability of heat preservation and moisture preservation of regenerated cellulose membrane was tested, and the effect was close to that of conventional polyethylene membrane. The membrane material has broad application prospects in packaging, food preservation, agriculture, and other fields.

Facile preparation and performance study of antibacterial regenerated cellulose carbamate fiber based on N-halamine

“…The characteristic peaks at 3320 cm −1 , 1645 cm −1 , and 1010 cm −1 of the sample are attributed to the bending vibration of –OH stretching (Zhang et al 2019b ). Furthermore, the absorption peak of the four curves at 2890 cm −1 can be regarded as an indication of the tensile vibration of the carbon-hydrogen bond in the sample (Xu et al 2020 ). CC showed a new peak at 1713 cm −1 , which was the contribution of the carbonyl group (C=O) in the carbamate, indicating that Cel has been successfully modified (Vo et al 2010 ).…”

Reactive Deep Eutectic Solvent for an Eco-Friendly Synthesis of Cellulose Carbamate

“…This Lewis acid was combined with urea, which is not only one of the most used components in DESs but also represents a A frequently used approach to enhance cellulose solubility is pre-chemical modification, such as converting it into cellulose carbamate (CC), as shown in Scheme 1. This modification renders cellulose biodegradable and biocompatible, making it an eco-friendly material with applications in absorbent products, food packaging, chromatography, and fireproof products [18][19][20][21][22][23][24] The conventional "CarbaCell" process involves heating cellulose with urea, resulting in cellulose carbamates with a nitrogen content (N%) of around 1-2.5% (Scheme 1) [25]. However, this process faces challenges in industrial reproducibility due to rigorous conditions, including high temperatures, long reaction times, and the use of a catalyst [26].…”

A Review on the Modification of Cellulose and Its Applications

“…In [AMIM][Cl], the cellulose with 3,5-dimethylphenyl isocyanate resulted in the formation of cellulose-tris(3,5 dimethylphenylcarbamate) (CDMPC). [ 87 ] Cellulose 6-benzoate- 2,3-phenylcarbamates, a series of Regio selectively-substituted [ 88 ] hybrid esters, were synthesized in [AMIM][Cl] using a simple two-step technique [ 89 ]. This shows that highly chiral cellulose derivatives with electron-donating substituents on the benzene ring are similar to the commercial Chiral column.…”