| || || Pal, Vikashni Vandana.|
| || || Behaviour, biodegradability and miscibility study of chitosan with three other polymers|
Author:Pal, Vikashni Vandana.
Institution: University of the South Pacific.
Call No.: Pac TP 248 .65 .C55 P35 2006
Copyright:10-20% of this thesis may be copied without the authors written permission
Abstract: The behaviour, biodegradability and miscibility study of chitosan with poly (vinyl butyral) (PVB), poly (vinyl formal) (PVF) and poly (vinyl acetate) (PVAc) have been investigated by means of visual observations, Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and Dynamic Mechanical Thermal Analysis (DMTA). PVB, PVF, and PVAc were blended with chitosan (CS) using the solution blending method where the three polymers were dissolved in formic acid. All the blends showed immiscibility over the whole composition range studied. The FTIR spectra gave results containing peaks from both the polymers in the blends. No shifts in peaks were observed in any of the blends. DMTA results obtained showed two glass transitions in all cases, with no evidence of any partial miscibility in the blends. The micrographs showed 2-phase systems in all cases. Mechanical properties showed that chitosan had higher tensile strength but low percentage elongation (little stretchability) whereas PVB and PVF showed higher percentage elongation (higher stretchability). Hence if the PVF/CS and PVB/CS blends were miscible, they could prove to be good materials for use, such as in biomedical applications etc. Study of the biodegradation of the PVF/CS blend showed a decrease in weight indicating degradation of the blends. The polymer samples showed physical deterioration, again indication that degradation took place, after being placed in soil over a period of 6 weeks.