Comparison of Antibacterial Properties of Different Polylactic Acid Composite Film
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Abstract:
In order to study the antibacterial properties of polylactic acid composite film after adding antibacterial agent, four antibacterial agents, chitosan, tea polyphenol, MgO and silver, were selected to form four composite films with polylactic acid and the effects of different antibacterial agents were compared. The structures of the composite films were characterized by FTIR. The experiment found that no matter which kind of antibacterial agent, it showed good antibacterial effect. When chitosan/polylactic acid and tea polyphenol/polylactic acid were combined into a composite film at a mass ratio of 5:5, the antibacterial percentages were 68.54% and 70.26%,respectively. When the amount of MgO added was 2%, the antibacterial percentage was 71.01%, while silver showed a strong antibacterial effect, the antibacterial percentage reached 98.53% when the amount was 1%. The light transmittance decreased to varying degrees with the addition of antibacterial agents, among which tea polyphenols had the greatest influence, from 88.67% to 33.75%. The DSC curve of the film showed that the films’ Tm was 80.3 ℃ with no antibacterial agent added. After adding Ag and MgO, the films’ Tm decreased by 1.7 ℃ and 1.4 ℃, respectively. This showed that the addition of antibacterial agents had almost no effect on the film Tm. It can be seen that the antibacterial effect of the natural antibacterial agent is slightly worse than the inorganic antibacterial agent.
