Preparation of Bromodeoxycellulose and Derivatives from Shambat Cotton Lint Using Dimethyl Acetamide / Lithium Bromide Solvent System
Abstract
This study was designed to prepare cellulose derivatives with
different functional groups from Sudanese Shambat cotton lint
using a homogenous solubilisation medium. The raw cotton lint
was mercerized in (15%) NaOH solution to weaken the
aggregation of the bundles of cellulose fibers; and was
subsequently dissolved in N,N-dimethylacetamide/lithium
bromide (DMA/LiBr) as a homogenous solvent system.
Bromodeoxycellulose was synthesized by treatment, of the
solubilised cotton cellulose with N-bromosuccinimide (NBS) in
the presence of triphenylphosphine (Ph3P) to convert the
hydroxyl groups into the bromodeoxy derivative of cellulose.
The chemical structure this derivative was investigated using
infrared spectroscopy, elemental analysis which confirmed the
presence of C-Br bonds. Thermal analysis (TGA, DSC) has
shown that unlike chlorordeoxycellulose and unmodified
mercerized cotton, bromodeoxycellulose was relatively thermally
stable. Azido and amino deoxycellulose were easily prepared
from bromodeoxycellulose since bromide is a good leaving.
Solubility in some organic solvents was tested to explore possible
new uses and applications.
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