| || || Kumar, Parvish Nikesh.|
| || || Miscibility studies of chitosan with other polymers as a function of degree of deacetylation of chitosan|
Author:Kumar, Parvish Nikesh.
Institution: University of the South Pacific.
Call No.: Pac TP 248 .65 .C55 K86 2008
Copyright:Under 10% of this thesis may be copied without the authors written permission
Abstract: Chitosan samples with 86, 91 and 97% degree of deacetylation (DD) values were characterized using the titration and IR methodologies. The DD values were calculated using graphs plotted from the second derivative of the titration data. It was found that the titration method of DD analysis was more accurate than IR method. Chitosan samples with different DD values were blended with PVB, PVF and PEO and their blend properties were studied. The glass transition temperature of chitosan was studied using Differential Scanning Calorimeter (DSC) and Dynamic Thermal Mechanical Analyser (DMTA). Four thermal transitions between temperature ranges 90 to 2070C were identified for chitosan samples using DMTA. It was also observed that solvent used to make the polymer films suppressed the thermal transitions. An endothermic peak was observed at 69.440C in the DSC thermogram of pure PEO powder while for PEO films made in formic acid showed this endothermic peak at 64.740C. It was evident that the solvent had some effect on the glass transition temperature. Intermolecular interactions studied using Fourier Transform Infrared Spectrometer (FTIR) showed the presence of hydrogen bonding in the Chs/PVB blend system. Chs/PVF system showed possible loss of intermolecular interaction between the amide II iii proton of chitosan and the oxygen of the PVF glycosidic linkage. Chs/PEO systems showed strong intermolecular interactions as we