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Journal of Materials Science

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10-04-2019 | Materials for life sciences

Antibacterial activity of sustainable composites derived from epoxidized natural rubber/silver-substituted zeolite/poly(lactic acid) blends

Authors: Phruedsaporn Taranamai, Pranee Phinyocheep, Watanalai Panbangred, Mayura Janhom, Philippe Daniel

Published in: Journal of Materials Science | Issue 14/2019

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Abstract

Sustainable composites derived from epoxidized natural rubber (ENR)/silver-substituted zeolite (AgZ)/poly(lactic acid) (PLA) blends possessing antibacterial activity were reported. ENR, herein, acted as an antibacterial promoter providing more hydrophilicity to the composites and facilitating water diffusion. Two methodologies were used to prepare composites, including solution casting (S) as well as solution casting followed by roll milling (SR). Both composites were compared in terms of morphology, AgZ dispersion, water absorption, and antibacterial activity. The shift of T_g and tan δ toward lower temperature of PLA composites consistently confirmed the compatibility between ENR and PLA by DSC and DMA results, respectively. The good AgZ distribution was observed in composites-SR, as confirmed by SEM/EDX. The results of agar disk diffusion susceptibility test showed that PLA, AgZ/PLA, and even ENR/AgZ/PLA composites-S showed no or less inhibition zone; meanwhile, ENR/AgZ/PLA composites-SR showed the significant inhibition zone against both Escherichia coli and Staphylococcus aureus. Besides, the antibacterial activity of the composites was required at least 5 wt% of AgZ. More than 98% inhibition of S. aureus growth by the composites-SR was observed during 2–24 h of cultivation, whereas AgZ/PLA provided the highest inhibition of only 75% at 24 h of cultivation. Hence, the incorporation of ENR enhances the bactericidal activity of the composites. In terms of mechanical properties, incorporating ENR into the composites decreased tensile modulus and strength, but increased the impact strength significantly. Therefore, the developed composites could be promising materials in food and biomedical fields in which antibacterial and impact resistance properties are required.

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Title: Antibacterial activity of sustainable composites derived from epoxidized natural rubber/silver-substituted zeolite/poly(lactic acid) blends
Authors: Phruedsaporn Taranamai
Pranee Phinyocheep
Watanalai Panbangred
Mayura Janhom
Philippe Daniel
Publication date: 10-04-2019
Publisher: Springer US
Published in: Journal of Materials Science / Issue 14/2019
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-019-03599-1

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