Synthesis, characterization and in-vitro antimicrobial evaluation of thermally and photostable Schiff base-modified PVC/nanocomposites

Abstract

Two Schiff base derivatives, 4-[(2, 5-dimethoxy phenylimino)-methyl] phenol, SB1 and 4-[(2-hydroxy benzylidine)-amino] phenolSB2, have been prepared and used as modifiers for polyvinyl chloride (PVC). Chemical modification of PVC was performed using these Schiff base sin presence ofAgNO3to obtain two modified PVC nanocomposite,PVC-SB1/AgNPs and PVC-SB2/AgNPs, and their chemical structures were confirmed by FTIR, 1 H-NMR, 13 C NMR and Mass spectroscopy. Scanning and transmission electron microscopy were performed for the modified polymer nanocomposites. The SEM and TEM micrographs of PVC-SB/AgNPs showed homogeneous surface polymeric matrix with uniform distribution of AgNPs, and their diameters are in the nanoscale. Moreover, thermal and photostabilities as well as mechanical properties of the modified polymer nanocomposites were also investigated. Moreover, mechanical properties of PVC-SB/AgNPs were also investigated. Antimicrobial activity of the modified PVC was evaluated against two Gram +ve bacteria (Bacillus subtitles and Staphylococcus aurous) and two Gram -ve bacteria (Escherichia coli and Pseudomonas aeruginosa) as well as Candida albicans as fungus.

Revisiting poly(vinyl chloride) reactivity in the context of chemical recycling

“…Previous work with PVC has primarily utilized S-, N- and O-based nucleophiles to generate materials for targeted applications such as catalysis, 34–41 separations, 42–47 metal-complexation, 48–55 biodegradable polymers, 56,57 thermally stable and photostable polymers, 58,59 and antimicrobial polymers. 59,60 In their 2010 and 2015 reviews, Moulay outlines many transformations that occur via a heterolytic, S N 2 mechanism. 61,62…”

“…Previous work with PVC has primarily utilized S-, N-and O-based nucleophiles to generate materials for targeted applications such as catalysis, [34][35][36][37][38][39][40][41] separations, [42][43][44][45][46][47] metal-complexation, [48][49][50][51][52][53][54][55] biodegradable polymers, 56,57 thermally stable and photostable polymers, 58,59 and antimicrobial polymers. 59,60 In their 2010 and 2015 reviews, Moulay outlines many transformations that occur via a heterolytic, S N 2 mechanism. 61,62 As an example, Reinecke and coworkers developed a method to attach phthalate-and isophthalate-based plasticizers to PVC via thiol substitution, which would reduce plasticizer contamination in other waste streams during recycling (Scheme 2A).…”