Skip to Content
MilliporeSigma
  • Synthesis of cellulose triacetate from cotton cellulose by using NIS as a catalyst under mild reaction conditions.

Synthesis of cellulose triacetate from cotton cellulose by using NIS as a catalyst under mild reaction conditions.

Carbohydrate polymers (2015-06-17)
Ahmed El Nemr, Safaa Ragab, Amany El Sikaily, Azza Khaled
ABSTRACT

This research discusses the acetylation of cotton cellulose with acetic anhydride without solvents. The acetylation was done in the presence of different amounts of N-Iodosuccinimide (NIS) as a catalyst; this took place under mild reaction conditions. The extent of acetylation was measured by the weight percent gain (WPG) that varied from 24.71 to 71.83%. Cotton cellulose acetates, with the degree of substitution (DS) that ranged from 0.89 to 2.84, were prepared in one step. The cellulose triacetate, with a degree of substitution (DS) 2.84, was obtained. The WPG and DS were easily controlled by changing the reaction duration (1-5h), and the concentration of the catalyst (0.05 g, 0.075 g and 0.10 g for 1g of cellulose) in 25 ml of acetic anhydride. NIS was recognized as a novel and more successful catalyst for the acetylation of hydroxyl groups in cotton cellulose. Formation of the acetates and the calculation of the degree of substitution were performed by FT-IR, Raman, and (1)H NMR.

MATERIALS
Product Number
Brand
Product Description

Supelco
Ethanol standards 10% (v/v), 10 % (v/v) in H2O, analytical standard
Sigma-Aldrich
Ethanol, JIS first grade, 94.8-95.8%
Sigma-Aldrich
Ethanol, JIS special grade, 94.8-95.8%
Sigma-Aldrich
Ethanol Fixative 80% v/v, suitable for fixing solution (blood films)
Sigma-Aldrich
Acetic anhydride, ReagentPlus®, ≥99%
Sigma-Aldrich
Acetic anhydride, ACS reagent, ≥98.0%
Sigma-Aldrich
Acetic anhydride, Arxada quality, ≥99.5% (GC)
Sigma-Aldrich
Acetic anhydride, 99.5%
Sigma-Aldrich
Ethyl alcohol, Pure, 200 proof, anhydrous, ≥99.5%
Sigma-Aldrich
Ethyl alcohol, Pure, 190 proof, meets USP testing specifications
Sigma-Aldrich
Ethyl alcohol, Pure, 190 proof, ACS spectrophotometric grade, 95.0%
Sigma-Aldrich
Acetic anhydride
Sigma-Aldrich
Acetic anhydride, JIS special grade
Sigma-Aldrich
Ethanol, JIS 300, ≥99.5%, for residue analysis
Sigma-Aldrich
Ethanol, ≥99.5%, suitable for HPLC
Sigma-Aldrich
Ethanol, JIS 1000, ≥99.5%, for residue analysis
Sigma-Aldrich
Ethanol, ≥99.5%
Sigma-Aldrich
Ethanol, ≥99.5%, SAJ super special grade
Sigma-Aldrich
Ethanol, ≥99.5%, suitable for absorption spectrum analysis
Sigma-Aldrich
Ethanol, ≥99.5%, suitable for fluorescence