Synthesis of polyethylene/silica-silver nanocomposites with antibacterial properties by in situ polymerization

• Published in: European polymer journal Vol. 106; pp. 92 - 101
• Main Authors: Pavoski, Giovani, Kalikoski, Renan, Souza, Gustavo, Brum, Luiz Fernando Wentz, dos Santos, Cristiane, Abo Markeb, Ahmad, dos Santos, João Henrique Zimnoch, Font, Xavier, dell'Erba, Ignacio, Galland, Griselda Barrera
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.09.2018; Elsevier BV
• Subjects: Catalysis; Catalysts; Chemical synthesis; Crystallization; Fillers; Morphology; Nanocomposites; Nanoparticles; Polyethylene; Polyethylenes; Polymerization; Silicon dioxide; Silver nanoparticles; Zirconium; Nanocomposites; Polymerization; Silver nanoparticles
• ISSN: 0014-3057; 1873-1945
• DOI: 10.1016/j.eurpolymj.2018.07.011

[Display omitted] •Polyethylene/Silica-Ag nanocomposites were obtained through in situ polymerization of ethylene.•Nanocomposites showed antibacterial activity against S aureus, Salmonella spp. and E. coli.•Inhibition of bacterial growth occurs through surface contact.•The main feature of this work was the production of a thermoplastic with antibacterial properties.•Nanocomposites made with SiAg obtained by the acidic route showed greater inhibition of bacterial growth. Synthesis of polyethylene/silica-silver nanocomposites (PE/SiAg) by in situ polymerization with supported and non-supported catalysts was achieved using the Cp2ZrCl2/MAO catalytic system. Silica-silver nanoparticles (SiAg) were synthesized via two routes (acidic and basic) and characterized to determine the silver content, morphology, and size. The basic route resulted in particles with a lower concentration of silver and with smaller diameters. The polymerizations of ethylene in the presence of the fillers produced high yields of nanocomposites. The catalyst support in SiAg was efficient, although the percentage of Zr effectively immobilized was very low. Polyethylene melting and crystallization temperatures did not change significantly with the addition of the filler. SEM images showed differences in the morphologies between the supported and non-supported catalysis, and between the acidic and basic conditions for SiAg preparation. Two different tests were performed and showed that the nanocomposites inhibited the proliferation of bacteria in contact with the films.