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The graft polymerization of ϵ-caprolactone onto chitosan was carried out smoothly under microwave irradiation, via a protection-graft-deprotection procedure with phthaloylchitosan as precursor and stannous octoate as catalyst. The chemical structure of the obtained chitosan-g-polycaprolactone...
The adsorption process of Pb (II) ions from aqueous solution by crosslinked amphoteric starch with quaternary ammonium and carboxymethyl groups was investigated. The adsorption capacity is found to be dependent on the pH of the solution, the dose of the crosslinked amphoteric starch, and the...
The introduction of salicylaldehyde and derivatives at the C-2 nitrogen position of chitosan with low degree of acetylation has been investigated. Chitosan was reacted with salicylaldehyde and its 5-bromo, 5-chloro, 5-nitro, 5-methyl and 5-methoxy derivatives. The resulting biopolymeric Schiff...
In the present contribution, blend films of hexanoyl chitosan (H-chitosan) and polylactide (PLA) were prepared by the solution-casting technique from the corresponding blend solutions in chloroform. Fourier-transformed infrared spectroscopy results indicated no significant interaction between...
Two series of semi-interpenetrating polymer network (semi-IPN) films, coded as PUNT and PUN, have been prepared from amorphous nitrochitosan (NCH) and semicrystalline poly(ester-urethane) (PU) cross-linked to the hydroxy groups of tris(hydroxymethyl)propane (TMP) and NCO groups of PU prepolymer,...
Scleroglucan gels were made by alkaline denaturation and subsequent renaturation of the scleroglucan triple helix by in situ neutralization. Gels prepared from 4 to 5% scleroglucan solutions were incubated in aqueous solutions and dependence of pH, temperature and ionic strength, I , were...
Effects of plasticizers (glycerol, sorbitol, and 1:1 mixture of glycerol and sorbitol) on moisture sorption characteristics of cassava starch films were investigated at three levels of plasticizer concentration (0, 20, and 40 g/100 g starch). The combined effects of relative humidity and...
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