Preparation and performance of chitosan/corn starch crosslinked films
Chitosan(CS)/corn starch(St)/citric acid(CA)crosslinked films were prepared by a tape casting method us-ing CS and St as raw materials and CA as a crosslinking agent.The effects of CS and ST contents on the thermal stabili-ty,water solubility,moisture resistance,and mechanical properties of the crosslinked films were investigated.The re-sults indicated that the addition of CA generated a significant impact on the performance of the crosslinked films,and the as-prepared films exhibited the best comprehensive performance when the mass ratio of CS/St was 2∶1 and the mass frac-tion of CA in the solution was 2.In this case,the films presented a maximum thermal decomposition temperature of 366.3℃,a mass residue rate of 28.3%,a water content of 8.16 wt%,a water solubility of 28.48%,a swelling de-gree of 18.72%,a water contact angle of 101.5 ° on the film surface.Their water vapor permeability was determined to be 8 g/(m2·24 h),which was reduced by 12.25 times.The films also exhibited a water vapor permeability coefficient of 0.488×10-13 g·cm/(cm2·s·Pa).Their tensile strength was increased from 3.7 to 12.5 MPa,and their elongation at break was increased from 85.3%to 113.2%.
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