Antibacterial and Mechanical Properties of Mussel-Inspired Layered Clay Reinforced Polylactic Acid-Polypyrrole Multilayer Composite Films

摘要

In this work, multilayer composite films based on mussel-inspired polydopamine-coated layered double hydroxides (LDHs@PDA), polylactic acid (PLA) and polypyrrole (PPy) were synthesized in-situ by a chemical polymerization, resulting in the induced absorption of PPy on the surface of LDHs@PDA/PLA composite film. Due to the excellent interfacial compatibility and bonding force of PDA, LDHs@PDA can also improve the mechanical properties of PLA-PPy multilayer composite film, and reduce the negative effect of PPy. Compared with PLA-PPy multilayer composite film, the tensile strength and elongation at break of LDHs@PDA/PLA-PPy multilayer composite film can reach 49.7 MPa and 32.3%, which even increase by 19% and 37%, respectively. Meanwhile, with the incorporation of LDHs@PDA, thermal stability of LDHs@PDA/PLA-PPy multilayer composite film is almost not reduced due to the high thermal stability of PDA relatively. Additionally, the observed antibacterial properties suggest that PLA-PPy multilayer composite film has strong antibacterial activity and can be used further for application as an effective antibacterial polymeric packaging material.