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Polyolefin/ZnO Composites Prepared by Melt Processing

Composites of polyolefin matrices (HDPE and PP) were prepared by melt processing using two commercially available nano ZnO powders (Zinkoxyd aktiv and Zano 20). The mechanical and thermal properties, UV-Vis stability, and antibacterial activity of composites were studied. Tensile testing revealed th...

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Autores principales: Anžlovar, Alojz, Primožič, Mateja, Švab, Iztok, Leitgeb, Maja, Knez, Željko, Žagar, Ema
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6651218/
https://www.ncbi.nlm.nih.gov/pubmed/31269674
http://dx.doi.org/10.3390/molecules24132432
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author Anžlovar, Alojz
Primožič, Mateja
Švab, Iztok
Leitgeb, Maja
Knez, Željko
Žagar, Ema
author_facet Anžlovar, Alojz
Primožič, Mateja
Švab, Iztok
Leitgeb, Maja
Knez, Željko
Žagar, Ema
author_sort Anžlovar, Alojz
collection PubMed
description Composites of polyolefin matrices (HDPE and PP) were prepared by melt processing using two commercially available nano ZnO powders (Zinkoxyd aktiv and Zano 20). The mechanical and thermal properties, UV-Vis stability, and antibacterial activity of composites were studied. Tensile testing revealed that both nano ZnO types have no particular effect on the mechanical properties of HDPE composites, while some positive trends are observed for the PP-based composites, but only when Zano 20 was used as a nanofiller. Minimal changes in mechanical properties of composites are supported by an almost unaffected degree of crystallinity of polymer matrix. All polyolefin/ZnO composites exposed to artificial sunlight for 8–10 weeks show more pronounced color change than pure matrices. This effect is more evident for the HDPE than for the PP based composites. Color change also depends on the ZnO concentration and type; composites with Zano 20 show more intense color changes than those prepared with Zinkoxyd aktiv. Results of the antibacterial properties study show very high activity of polyolefin/ZnO composites against Staphylococcus aureus regardless of the ZnO surface modification, while antibacterial activity against Escherichia coli shows only the composites prepared with unmodified ZnO. This phenomenon is explained by different membrane structure of gram-positive (S. aureus) and gram-negative (E. coli) bacteria.
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spelling pubmed-66512182019-08-07 Polyolefin/ZnO Composites Prepared by Melt Processing Anžlovar, Alojz Primožič, Mateja Švab, Iztok Leitgeb, Maja Knez, Željko Žagar, Ema Molecules Article Composites of polyolefin matrices (HDPE and PP) were prepared by melt processing using two commercially available nano ZnO powders (Zinkoxyd aktiv and Zano 20). The mechanical and thermal properties, UV-Vis stability, and antibacterial activity of composites were studied. Tensile testing revealed that both nano ZnO types have no particular effect on the mechanical properties of HDPE composites, while some positive trends are observed for the PP-based composites, but only when Zano 20 was used as a nanofiller. Minimal changes in mechanical properties of composites are supported by an almost unaffected degree of crystallinity of polymer matrix. All polyolefin/ZnO composites exposed to artificial sunlight for 8–10 weeks show more pronounced color change than pure matrices. This effect is more evident for the HDPE than for the PP based composites. Color change also depends on the ZnO concentration and type; composites with Zano 20 show more intense color changes than those prepared with Zinkoxyd aktiv. Results of the antibacterial properties study show very high activity of polyolefin/ZnO composites against Staphylococcus aureus regardless of the ZnO surface modification, while antibacterial activity against Escherichia coli shows only the composites prepared with unmodified ZnO. This phenomenon is explained by different membrane structure of gram-positive (S. aureus) and gram-negative (E. coli) bacteria. MDPI 2019-07-02 /pmc/articles/PMC6651218/ /pubmed/31269674 http://dx.doi.org/10.3390/molecules24132432 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Anžlovar, Alojz
Primožič, Mateja
Švab, Iztok
Leitgeb, Maja
Knez, Željko
Žagar, Ema
Polyolefin/ZnO Composites Prepared by Melt Processing
title Polyolefin/ZnO Composites Prepared by Melt Processing
title_full Polyolefin/ZnO Composites Prepared by Melt Processing
title_fullStr Polyolefin/ZnO Composites Prepared by Melt Processing
title_full_unstemmed Polyolefin/ZnO Composites Prepared by Melt Processing
title_short Polyolefin/ZnO Composites Prepared by Melt Processing
title_sort polyolefin/zno composites prepared by melt processing
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6651218/
https://www.ncbi.nlm.nih.gov/pubmed/31269674
http://dx.doi.org/10.3390/molecules24132432
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