Mechanical and antibacterial properties of a nanocellulose-polypyrrole multilayer composite

Bideau, B., Bras, J., Saini, S., Daneault, C. et Loranger, E. (2016). Mechanical and antibacterial properties of a nanocellulose-polypyrrole multilayer composite. Materials Science and Engineering C, 69 . pp. 977-984. ISSN 0928-4931 DOI 10.1016/j.msec.2016.08.005

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Résumé

In this study, a composite film based on TEMPO-oxidized cellulose nanofibers (TOCN), polyvinyl alcohol (PVA) and polypyrrole (PPy) was synthesized in situ by a chemical polymerization, resulting in the induced absorption of PPy on the surface of the TOCN. The composite films were investigated with scanning electron microscopy, thermogravimetric analysis, contact angle measurements, mechanical tests, and evaluation of antibacterial properties. The developed composite has nearly identical Young modulus (3.4 GPa), elongation (2.6%) and tensile stress (about 51 MPa) to TOCN even if PPy, which as poor properties by itself, was incorporated. From the energy-dispersive X-ray spectroscopy (EDX) results, it was shown that PPy is mainly located on the composite surface. Results confirmed by an increase from 54.5 to 83° in contact angle, an increased heat protection (Thermogravimetric analysis) and a decrease in surface energy. The nanocomposites were also evaluated for antibacterial activity against bacteria occasionally found in food: Gram-positive Bacillus subtilis (B. subtilis) and Gram-negative bacteria Escherichia coli (E. coli). The results indicate that the nanocomposites are effective against all of the bacteria studied as shown by the decrease of 5.2 log colony forming units (CFU) for B. subtilis and 6.5 log CFU for E. coli. Resulting in the total destruction of the studied bacteria. The perfect match between the resulting inhibition zone and the composite surface area has demonstrated that our composite was contact active with a slight leaching of PPy. Our composite was successful as an active packaging on meat (liver) as bacteria were killed by contact, thereby preventing the spread of possible diseases. While it has not been tested on bacteria found in medicine, TOCN/PVA-PPy film may be able to act as an active sterile packaging for surgical instruments. © 2016 Elsevier B.V.

Type de document:	Article
Mots-clés libres:	antibacterial composite mechanical nanofibers cellulose polypyrrole bacteria bacteriology cellulose composite films composite materials contact angle energy dispersive spectroscopy escherichia coli nanocomposites nanofibers polypyrroles scanning electron microscopy surgical equipment thermogravimetric analysis X ray spectroscopy anti-bacterial activity antibacterial properties energy dispersive X ray spectroscopy Escherichia coli (E. coli) poly (vinyl alcohol) (PVA) TEMPO-oxidized cellulose nanofibers nanocomposite films amine oxide antiinfective agent nanofiber nanoparticle polymer polyvinyl alcohol pyrrole derivative TEMPO animal chemistry drug effects mechanics microbial sensitivity test pig spectrometry temperature thermogravimetry animals anti-bacterial Agents Cyclic N-Oxides mechanical phenomena microbial sensitivity tests nanoparticles polymers pyrroles spectrometry, X-Ray emission Sus scrofa
Date de dépôt:	01 juill. 2021 13:36
Dernière modification:	01 juill. 2021 13:36
Version du document déposé:	Post-print (version corrigée et acceptée)
URI:	https://depot-e.uqtr.ca/id/eprint/9643

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