Hybrid Composites Based on Thermoplastic Polyurethane With a Mixture of Carbon Nanotubes and Carbon Black Modified With Polypyrrole for Electromagnetic Shielding
Hybrid conducting composites comprising thermoplastic polyurethane (TPU) and mixtures of carbon black modified with polypyrrole (CB-PPy) and carbon nanotubes (CNT) were prepared by melt mixing process. The electrical conductivity, rheological properties and electromagnetic shielding effectiveness (E...
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| Format: | Article |
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Frontiers Media S.A.
2020-06-01
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| Series: | Frontiers in Materials |
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| Online Access: | https://www.frontiersin.org/article/10.3389/fmats.2020.00174/full |
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| author | Mayara C. Bertolini Sílvia D. A. S. Ramoa Claudia Merlini Claudia Merlini Guilherme M. O. Barra Bluma G. Soares Alessandro Pegoretti |
| author_facet | Mayara C. Bertolini Sílvia D. A. S. Ramoa Claudia Merlini Claudia Merlini Guilherme M. O. Barra Bluma G. Soares Alessandro Pegoretti |
| author_sort | Mayara C. Bertolini |
| collection | DOAJ |
| description | Hybrid conducting composites comprising thermoplastic polyurethane (TPU) and mixtures of carbon black modified with polypyrrole (CB-PPy) and carbon nanotubes (CNT) were prepared by melt mixing process. The electrical conductivity, rheological properties and electromagnetic shielding effectiveness (EMI SE) of TPU/CB-PPy and TPU/CNT composites were also investigated those results observed for TPU/CB-PPy/CNT hybrid composites. TPU/CNT composites show a very sharp insulator-conductor transition and the electrical percolation threshold was about 1 wt% of CNT, which was lower than that found for TPU/CB-PPy (7 wt%). Moreover, EMI SE values of TPU/CNT composites were higher than those for TPU/CB-PPy due to the denser CNT conductive pathway into TPU matrix. In order to achieve the highest electrical conductivity and EMI SE values, mixtures of CB-PPy/CNT were added in the composites in different mass fractions. In fact, the electrical conductivity values increased by combining CB-PPy and CNT, resulting in hybrid composites of TPU/CB-PPy/CNT with higher EMI SE values when compared to TPU/CB-PPy composites. The present study demonstrates the potential use of hybrid polymer composites containing 5 or 8 wt% of CB-PPy/CNT at specific CB-PPy/CNT ratios with good processabilty and EMI SE values as high as −20 dB indicating the potential use of these materials for electromagnetic shielding application in the X-band frequency region. |
| first_indexed | 2024-12-13T11:32:55Z |
| format | Article |
| id | doaj.art-ca00042f52254361a3fceba2ea41ed90 |
| institution | Directory Open Access Journal |
| issn | 2296-8016 |
| language | English |
| last_indexed | 2024-12-13T11:32:55Z |
| publishDate | 2020-06-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Materials |
| spelling | doaj.art-ca00042f52254361a3fceba2ea41ed902022-12-21T23:47:52ZengFrontiers Media S.A.Frontiers in Materials2296-80162020-06-01710.3389/fmats.2020.00174466845Hybrid Composites Based on Thermoplastic Polyurethane With a Mixture of Carbon Nanotubes and Carbon Black Modified With Polypyrrole for Electromagnetic ShieldingMayara C. Bertolini0Sílvia D. A. S. Ramoa1Claudia Merlini2Claudia Merlini3Guilherme M. O. Barra4Bluma G. Soares5Alessandro Pegoretti6Departamento de Engenharia Mecânica, Universidade Federal de Santa Catarina, Florianópolis, BrazilDepartamento de Engenharia Mecânica, Universidade Federal de Santa Catarina, Florianópolis, BrazilDepartamento de Engenharia Mecânica, Universidade Federal de Santa Catarina, Florianópolis, BrazilDepartamento de Engenharia, Universidade Federal de Santa Catarina, Blumenau, BrazilDepartamento de Engenharia Mecânica, Universidade Federal de Santa Catarina, Florianópolis, BrazilDepartamento de Engenharia Metalúrgica e de Materiais, Universidade Federal do Rio de Janeiro, Rio de Janeiro, BrazilDepartment of Industrial Engineering and INSTM Research Unit, University of Trento, Trento, ItalyHybrid conducting composites comprising thermoplastic polyurethane (TPU) and mixtures of carbon black modified with polypyrrole (CB-PPy) and carbon nanotubes (CNT) were prepared by melt mixing process. The electrical conductivity, rheological properties and electromagnetic shielding effectiveness (EMI SE) of TPU/CB-PPy and TPU/CNT composites were also investigated those results observed for TPU/CB-PPy/CNT hybrid composites. TPU/CNT composites show a very sharp insulator-conductor transition and the electrical percolation threshold was about 1 wt% of CNT, which was lower than that found for TPU/CB-PPy (7 wt%). Moreover, EMI SE values of TPU/CNT composites were higher than those for TPU/CB-PPy due to the denser CNT conductive pathway into TPU matrix. In order to achieve the highest electrical conductivity and EMI SE values, mixtures of CB-PPy/CNT were added in the composites in different mass fractions. In fact, the electrical conductivity values increased by combining CB-PPy and CNT, resulting in hybrid composites of TPU/CB-PPy/CNT with higher EMI SE values when compared to TPU/CB-PPy composites. The present study demonstrates the potential use of hybrid polymer composites containing 5 or 8 wt% of CB-PPy/CNT at specific CB-PPy/CNT ratios with good processabilty and EMI SE values as high as −20 dB indicating the potential use of these materials for electromagnetic shielding application in the X-band frequency region.https://www.frontiersin.org/article/10.3389/fmats.2020.00174/fullcarbon blackpolypyrrolecarbon nanotubesthermoplastic polyurethaneelectromagnetic shielding |
| spellingShingle | Mayara C. Bertolini Sílvia D. A. S. Ramoa Claudia Merlini Claudia Merlini Guilherme M. O. Barra Bluma G. Soares Alessandro Pegoretti Hybrid Composites Based on Thermoplastic Polyurethane With a Mixture of Carbon Nanotubes and Carbon Black Modified With Polypyrrole for Electromagnetic Shielding Frontiers in Materials carbon black polypyrrole carbon nanotubes thermoplastic polyurethane electromagnetic shielding |
| title | Hybrid Composites Based on Thermoplastic Polyurethane With a Mixture of Carbon Nanotubes and Carbon Black Modified With Polypyrrole for Electromagnetic Shielding |
| title_full | Hybrid Composites Based on Thermoplastic Polyurethane With a Mixture of Carbon Nanotubes and Carbon Black Modified With Polypyrrole for Electromagnetic Shielding |
| title_fullStr | Hybrid Composites Based on Thermoplastic Polyurethane With a Mixture of Carbon Nanotubes and Carbon Black Modified With Polypyrrole for Electromagnetic Shielding |
| title_full_unstemmed | Hybrid Composites Based on Thermoplastic Polyurethane With a Mixture of Carbon Nanotubes and Carbon Black Modified With Polypyrrole for Electromagnetic Shielding |
| title_short | Hybrid Composites Based on Thermoplastic Polyurethane With a Mixture of Carbon Nanotubes and Carbon Black Modified With Polypyrrole for Electromagnetic Shielding |
| title_sort | hybrid composites based on thermoplastic polyurethane with a mixture of carbon nanotubes and carbon black modified with polypyrrole for electromagnetic shielding |
| topic | carbon black polypyrrole carbon nanotubes thermoplastic polyurethane electromagnetic shielding |
| url | https://www.frontiersin.org/article/10.3389/fmats.2020.00174/full |
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