Oriented ultra-high molecular weight polyethylene/gold nanocomposites: Electrical conductivity and chain entanglement dynamics
Entanglement dynamics of uniaxially-oriented, disentangled ultra-high molecular weight polyethylene nanocomposites modified with gold nanoparticles are investigated, using dielectric spectroscopy, during the transition to melt state. The dc conduction is approximately calculated via the logarithmic...
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| Format: | Article |
| Language: | English |
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Budapest University of Technology and Economics
2021-06-01
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| Series: | eXPRESS Polymer Letters |
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| Online Access: | http://www.expresspolymlett.com/letolt.php?file=EPL-0011020&mi=cd |
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| author | S. X. Drakopoulos G. C. Psarras S. Ronca |
| author_facet | S. X. Drakopoulos G. C. Psarras S. Ronca |
| author_sort | S. X. Drakopoulos |
| collection | DOAJ |
| description | Entanglement dynamics of uniaxially-oriented, disentangled ultra-high molecular weight polyethylene nanocomposites modified with gold nanoparticles are investigated, using dielectric spectroscopy, during the transition to melt state. The dc conduction is approximately calculated via the logarithmic derivative of dielectric permittivity and is observed to decrease with the formation of entanglements. As the draw ratio increases, the progressive formation of entanglements resulted in a stronger dc conductivity decrease due to the loss of orientation in the pre-melt crystalline and partially oriented amorphous chain segments. Additionally, a sharp peak is obtained in the absence of dc conductivity, attributed to the dipolar contribution of the Maxwell-Wagner-Sillars (MWS) interfacial polarization between the gold nanoparticles and the polymer chains. The relaxation time of the MWS interfacial polarization increases with the progressive formation of entanglements, as observed in a previous study. The results presented shed light on the process of entanglement formation in oriented ultrahigh molecular weight polyethylene nanocomposites. |
| format | Article |
| id | doaj-art-0b8890433fb44c5a86e99fc7cdfd0c0a |
| institution | Kabale University |
| issn | 1788-618X |
| language | English |
| publishDate | 2021-06-01 |
| publisher | Budapest University of Technology and Economics |
| record_format | Article |
| series | eXPRESS Polymer Letters |
| spelling | doaj-art-0b8890433fb44c5a86e99fc7cdfd0c0a2025-08-20T03:32:51ZengBudapest University of Technology and EconomicseXPRESS Polymer Letters1788-618X2021-06-0115649250210.3144/expresspolymlett.2021.42Oriented ultra-high molecular weight polyethylene/gold nanocomposites: Electrical conductivity and chain entanglement dynamicsS. X. DrakopoulosG. C. PsarrasS. RoncaEntanglement dynamics of uniaxially-oriented, disentangled ultra-high molecular weight polyethylene nanocomposites modified with gold nanoparticles are investigated, using dielectric spectroscopy, during the transition to melt state. The dc conduction is approximately calculated via the logarithmic derivative of dielectric permittivity and is observed to decrease with the formation of entanglements. As the draw ratio increases, the progressive formation of entanglements resulted in a stronger dc conductivity decrease due to the loss of orientation in the pre-melt crystalline and partially oriented amorphous chain segments. Additionally, a sharp peak is obtained in the absence of dc conductivity, attributed to the dipolar contribution of the Maxwell-Wagner-Sillars (MWS) interfacial polarization between the gold nanoparticles and the polymer chains. The relaxation time of the MWS interfacial polarization increases with the progressive formation of entanglements, as observed in a previous study. The results presented shed light on the process of entanglement formation in oriented ultrahigh molecular weight polyethylene nanocomposites.http://www.expresspolymlett.com/letolt.php?file=EPL-0011020&mi=cdnanocompositesdisentangled ultra-high molecular weightuniaxial orientationbroadband dielectric spectroscopyentanglement dynamics |
| spellingShingle | S. X. Drakopoulos G. C. Psarras S. Ronca Oriented ultra-high molecular weight polyethylene/gold nanocomposites: Electrical conductivity and chain entanglement dynamics eXPRESS Polymer Letters nanocomposites disentangled ultra-high molecular weight uniaxial orientation broadband dielectric spectroscopy entanglement dynamics |
| title | Oriented ultra-high molecular weight polyethylene/gold nanocomposites: Electrical conductivity and chain entanglement dynamics |
| title_full | Oriented ultra-high molecular weight polyethylene/gold nanocomposites: Electrical conductivity and chain entanglement dynamics |
| title_fullStr | Oriented ultra-high molecular weight polyethylene/gold nanocomposites: Electrical conductivity and chain entanglement dynamics |
| title_full_unstemmed | Oriented ultra-high molecular weight polyethylene/gold nanocomposites: Electrical conductivity and chain entanglement dynamics |
| title_short | Oriented ultra-high molecular weight polyethylene/gold nanocomposites: Electrical conductivity and chain entanglement dynamics |
| title_sort | oriented ultra high molecular weight polyethylene gold nanocomposites electrical conductivity and chain entanglement dynamics |
| topic | nanocomposites disentangled ultra-high molecular weight uniaxial orientation broadband dielectric spectroscopy entanglement dynamics |
| url | http://www.expresspolymlett.com/letolt.php?file=EPL-0011020&mi=cd |
| work_keys_str_mv | AT sxdrakopoulos orientedultrahighmolecularweightpolyethylenegoldnanocompositeselectricalconductivityandchainentanglementdynamics AT gcpsarras orientedultrahighmolecularweightpolyethylenegoldnanocompositeselectricalconductivityandchainentanglementdynamics AT sronca orientedultrahighmolecularweightpolyethylenegoldnanocompositeselectricalconductivityandchainentanglementdynamics |