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5130
Fatma Mahmoud Amin Radwan
Preparation and Characterization of some Cellulose Derivatives for Ion Exchangers and Hydrogels
Cellulose, due to its natural abundance and unique properties, is undoubtedly one: of the most promising renewable and biodegradable raw materials for the large scale production of chemicals, fuels, and materials in a bio-based economy. In order to develop eco-friendly polymeric materials, the chemical modification of cotton linters is the main object of this study which concentrated mainly into three parts. First, Microcrystalline cellulose (MCC) was derived from cotton linters by acid hydrolysis with different concentrations of HCl (2.5- t5%).Infrared spectroscopy and thermal analysis were used to follow the effect of hydrolysis on the molecular structure of the produced microcrystalline cellulose. Scanning electronmicroscope images and X-ray diffraction were also studied for more information about the crystallinity, fiber length, particle size, and shape of the produced microcrystalline cellulose. The obtained results showed that the crystallinity index of the hydrolyzed cotton increased by increasing acid concentration and then began to decrease at 15% HCI to value of 71.4%. The hydrolyzed cotton linters had a lower kinetic energy than the untreated sample. Moreover, the hydrolyzed cotton linters with high concentration of HCI (15%) had a lower kinetic energy with value of 100.2$ cal. Jhan those treated with lower concentration (5%) with value of 114.8 cal.
2015
Ph.d
Ain Shams
Science
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