| Summary: | 碩士 === 大葉大學 === 生物產業科技學系 === 95 === Chitosan salts were prepared by reacting chitosan with hydrochloride, nitric acid, and acetic acid, respectively. Chitosan salt aqueous solutions with concentration 0.5, 0.75, and 1.0 % (w/v) were further prepared and reacted with silver nitrate as well as glutaraldehyde. Solution casting method was used to prepare films. These films showed moisture absorptivity in a range between 16 and 29 %. The FESEM indicated that the size of a majority of the silver compound particles which were dispersed in the films ranged between 6 and 74 nm. Silver compound particles which dispersed in chitosan nitrate salt films had smaller average size than that which dispersed in chitosan hydrochloride salt films. The FTIR spectroscopy revealed that chitosan was crosslinked by glutaraldehyde. In contact angle measurement results, crosslined films had larger contact angle than that whitout crosslinked. Evaluation of tensile strength of films these were conducted using an rheometer. It was found that films with glutaraldehyde had higher tensile strength than that without glutaraldehyde. Elongation was increased with increasing the salt concentration, but decreased with increasing the glutaraldehyde content. From the impedance analysis results, it was found that the conductivity of membranes can be up to 1.2×10-3 S/cm.
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