title: Synthesis of cellulose triacetate from cotton cellulose by using NIS as a catalyst under mild reaction conditions.
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.
authors.affiliation: Marine Pollution Department, Environmental Division, National Institute of Oceanography and Fisheries, Kayet Bey, El-Anfoushy, Alexandria, Egypt. Electronic address: ahmedmoustafaelnemr@yahoo.com.
authors.forename: Ahmed
authors.initials: A
authors.lastname: El Nemr
authors.affiliation: Marine Pollution Department, Environmental Division, National Institute of Oceanography and Fisheries, Kayet Bey, El-Anfoushy, Alexandria, Egypt.
authors.forename: Safaa
authors.initials: S
authors.lastname: Ragab
authors.affiliation: Marine Pollution Department, Environmental Division, National Institute of Oceanography and Fisheries, Kayet Bey, El-Anfoushy, Alexandria, Egypt.
authors.forename: Amany
authors.initials: A
authors.lastname: El Sikaily
authors.affiliation: Marine Pollution Department, Environmental Division, National Institute of Oceanography and Fisheries, Kayet Bey, El-Anfoushy, Alexandria, Egypt.
authors.forename: Azza
authors.initials: A
authors.lastname: Khaled
mesh_terms: D000107:Acetylation; D002384:Catalysis; D002482:Cellulose / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry; D003368:Gossypium / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D013388:Succinimides / Q000737:chemistry*; D013818:Thermogravimetry
chemical_list: D013388:Succinimides; C008155:N-iodosuccinimide; D002482:Cellulose; C024671:cellulose triacetate
keywords: Acetylation; Cellulose triacetate; Cotton cellulose; N-Iodosuccinimide; Raman