An original antifouling strategy: polypropylene films modified with chitosan- coated silver nanoparticles

CARLA E. GIACOMELLI

JOURNAL OF APPLIED POLYMER SCIENCE

JOHN WILEY & SONS INC

Año: 2020 vol. 137

0021-8995

new coating strategy of polypropylene (PP) films with silver nanoparticles (AgNP) is proposed to obtain surfaces with antifouling properties. As a first step, the photograft polymerization is used to produce polyacrylic acid grafted on PP (PAA-grafted PP) films. A green AgNP synthesis is used by thermal reduction of AgNO3 2 with amino groups of chitosan (CS), which controls ion diffusion and stabilizes nanoparticles. AgNP/CS complexes are adsorbed on PAA-grafted PP by electrostatic interactions, yielding AgNP/CS-coated PP films. These films show an excellent antimicrobial activity, even for AgNP contents as low as 0.08 wt%, reducing more than 4 log units in the viable Staphylococcus aureus concentration or inducing Escherichia coli death. This trend is consistent with an adequate amount of small AgNP adsorbed in an organized manner within a thin surface layer. Therefore, the antimicrobial activity of this film seems to be more than promising, used as an active surface for a wide rang