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The wettability, mechanical and antimicrobial properties of polylactide/montmorillonite nanocomposite films

Rapacz-Kmita A., Pierchała M. K., Tomas-Trybuś A., Szaraniec B., Karwot J.

Acta of Bioengineering and Biomechanics

2017

Vol. 19, no. 4

25--33

The aim of this study was to evaluate the effect of the not activated (unmodified) montmorillonite (MMT) filler on the antibacterial properties of polymer nanocomposites with a biodegradable polylactide (PLA) matrix. The subject of research was selected to verify the reports on the lack of antibacterial properties of unmodified montmorillonite in nanocomposites and to investigate the potential condition of their manufacturing which are decisive for the resulting properties. Evaluation of antibacterial and mechanical properties of both the starting materials and the obtained nanocomposites filled with layered silicates, as well as the wettability of the materials measured by a sitting drop method, was made on samples in the form of a film. The results show that the surface wettability of the polymer nanocomposites did not exhibit significant change compared to the film of neat PLA. However, a significant improvement in the mechanical and antimicrobial properties of the nanocomposite films obtained in a specific solvent casting process of the nanocomposite preceded by exfoliation of the film in an ultrasonic homogenizer was demonstrated. The antibacterial activity against Gram-positive bacteria Staphylococcus aureus and Enterococcus faecalis was also observed, and moreover, the montmorillonite-containing films revealed a zone of inhibition of bacterial growth when tested against the lactose-positive bacteria of the Enterobacteriaceae family, which are present in the waste water. The advantageous properties of the obtained PLA/MMT nanocomposites suggest, that the unmodified montmorillonite may be potentially used as filler for polymer films in the packaging industry.

Budowa, właściwości i zastosowanie minerałów warstwowych

Kunert A., Zaborski M.

Przemysł Chemiczny

2006

T. 85, nr 11

1510-1517

Przedmiotem pracy są minerały warstwowe, ze szczególnym uwzględnieniem związków kationo- i aniono-wymiennych. Do minerałów warstwowych kationo-wymiennych zaliczane są przede wszystkim smektyty, których ważnym przedstawicielem jest montmorylonit. Natomiast minerały warstwowe aniono-wymienne stanowią podwójne wodorotlenki metali.

A review with 109 refs. covering the structure, classification, and properties of clays, esp. montmorillonite, smectites, and double-layered hydroxides.

Wpływ interkalowanych montmorylonitów na właściwości elastomerów butadienowo-akrylonitrylowanych

Zaborski M., Liszewska A., Bednarek B.

Przemysł Chemiczny

2003

T. 82, nr 8-9

981-984