Influence of the in-situ Modification of Nano-CaCO3 on the Properties of Composite Chitosan Coatings
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Abstract:
Nano-CaCO3-chitosan composite coatings were prepared by the tape-casting process with sodium stearate as an in-situ modifier. The influence of the conditions during in-situ modification on the properties of the composite coatings was studied in terms of mechanical properties (Ts and EB), water vapor permission (WVP), O2 permeability (OP), CO2 permeability (CDP), water solubility, water absorption, and antibacterial activity. The results showed that when the conditions for nanocomposite coating in situ was changed to 80 ℃ for 40 min, the tensile strength of the composite coatings improved significantly, barrier properties against moisture and O2 increased, CO2-barrier property decreased, and coating transmittance improved. These observations indicated that the compatibility between chitosan and CaCO3 was increased and the modification conditions significantly affected the performance of the composite coating. In addition, the modification temperature had a significant impact on the antibacterial activity of the coating against Pseudomonas aeruginosa and Serratia marcescens, whereas the modification time hardly affected the antibacterial activity against P. aeruginosa. This could be related to the mode of action of the polymer molecules in the nanocomposite coatings on the two types of bacteria or bacterial enzyme activity.
