The temperature and storage time dependence of the viscosity of chitosan in a number of solvents (formic, acetic and propionic acids solutions) was determined. The temperature effect was studied over a temperature range of 20 ºC to 50 ºC while the storage time effect was examined at room temperature for a duration ranging between one to four days. The effect of chain length of the solvents on the viscosity of chitosan solutions was also investigated. Remarkable change in the viscosity of chitosan solutions was observed by varying the temperature, storage time and chain length of the solvents thus concluding that in the suitable design of experimental conditions these parameters play a vital role.
ABDUL HAMID YAHYA ,ESAM AEL HEFIAN ,RASHID ATTA KHAN ,
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