Phthalimido thioureas with high antimicrobial performance as stabilizers for enhancement of the thermal stability of poly(vinyl chloride) loaded with multi‐walled carbon nanotubes

Some novel phthalimido thiourea stabilizers 1–4 were readily synthesized. Their structure was elucidated by elemental analysis, FTIR, 1H‐NMR, and mass spectroscopy. They showed good antimicrobial activity, in particularly the carboxyl derivative, as judged by their high inhibition zone diameter and...

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Bibliographic Details
Published in:Polymers for advanced technologies 2021-03, Vol.32 (3), p.1317-1332
Main Authors: Mohamed, Nadia A., Abd El‐Ghany, Nahed A., Fahmy, Mona M., Abdel‐Aziz, Marwa M.
Format: Article
Language:English
Subjects:
Antiinfectives and antibacterials
antimicrobial activity
Antimicrobial agents
Cadmium
Chemical analysis
Discoloration
E coli
Efficiency
Fourier transforms
Heat stabilizers
Infrared spectroscopy
Multi wall carbon nanotubes
MWCNTs
Nanocomposites
NMR
Nuclear magnetic resonance
phthalimido thiourea stabilizers
Polyvinyl chloride
PVC
Stabilizers (agents)
TG analysis
Thermal stability
Thioureas
Weight loss
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Summary:Some novel phthalimido thiourea stabilizers 1–4 were readily synthesized. Their structure was elucidated by elemental analysis, FTIR, 1H‐NMR, and mass spectroscopy. They showed good antimicrobial activity, in particularly the carboxyl derivative, as judged by their high inhibition zone diameter and low minimum inhibition concentration using the agar well diffusion technique. The results reveal the greater stabilizing efficiency of these stabilizers relative to dibasic lead carbonate, Cd‐Ba‐Zn stearate, and n‐OTM reference thermal stabilizers using TG technique in nitrogen. This is well illustrated by the higher initial decomposition temperature and lower rates of both weight loss and discoloration of the polymer during degradation. Moreover, the stabilizing efficiency is influenced by the nature of the substituent group in these stabilizers. While the methyl stabilizer is characterized by a greater efficiency relative to those of the chloro and carboxyl ones, the non‐substituted stabilizer lies between these two cases. The good disperse‐ability of multi‐walled carbon nanotubes (MWCNTs) into the polymeric material was ascertained using FTIR, XRD, SEM, and TEM. The thermal stability of PVC, which stabilized with 4, has been appreciably improved via loading 1 wt% of MWCNTs into its matrices. Further, PVC nanocomposites showed very high inhibition efficiency against Staphylococcus aureus and Escherichia coli.
ISSN:1042-7147
1099-1581
DOI:10.1002/pat.5179