Static and Dynamic Behavior of Polymer/Graphite Oxide Nanocomposites before and after Thermal Reduction
Nanocomposites of hyperbranched polymers with graphitic materials are investigated with respect to their structure and thermal properties as well as the dynamics of the polymer probing the effect of the different intercalated or exfoliated structure. Three generations of hyperbranched polyester poly...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-03-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/13/7/1008 |
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| author | Kiriaki Chrissopoulou Krystalenia Androulaki Massimiliano Labardi Spiros H. Anastasiadis |
| author_facet | Kiriaki Chrissopoulou Krystalenia Androulaki Massimiliano Labardi Spiros H. Anastasiadis |
| author_sort | Kiriaki Chrissopoulou |
| collection | DOAJ |
| description | Nanocomposites of hyperbranched polymers with graphitic materials are investigated with respect to their structure and thermal properties as well as the dynamics of the polymer probing the effect of the different intercalated or exfoliated structure. Three generations of hyperbranched polyester polyols are mixed with graphite oxide (GO) and the favorable interactions between the polymers and the solid surfaces lead to intercalated structure. The thermal transitions of the confined chains are suppressed, whereas their dynamics show similarities and differences with the dynamics of the neat polymers. The three relaxation processes observed for the neat polymers are observed in the nanohybrids as well, but with different temperature dependencies. Thermal reduction of the graphite oxide in the presence of the polymer to produce reduced graphite oxide (rGO) reveals an increase in the reduction temperature, which is accompanied by decreased thermal stability of the polymer. The de-oxygenation of the graphite oxide leads to the destruction of the intercalated structure and to the dispersion of the rGO layers within the polymeric matrix because of the modification of the interactions between the polymer chains and the surfaces. A significant increase in the conductivity of the resulting nanocomposites, in comparison to both the polymers and the intercalated nanohybrids, indicates the formation of a percolated rGO network. |
| first_indexed | 2024-03-10T12:55:29Z |
| format | Article |
| id | doaj.art-c53a18fb111a49f48e57a635e94737c6 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T12:55:29Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-c53a18fb111a49f48e57a635e94737c62023-11-21T11:56:55ZengMDPI AGPolymers2073-43602021-03-01137100810.3390/polym13071008Static and Dynamic Behavior of Polymer/Graphite Oxide Nanocomposites before and after Thermal ReductionKiriaki Chrissopoulou0Krystalenia Androulaki1Massimiliano Labardi2Spiros H. Anastasiadis3Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, N. Plastira 100, 700 13 Heraklion Crete, GreeceInstitute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, N. Plastira 100, 700 13 Heraklion Crete, GreeceCNR-IPCF, c/o Physics Department, University of Pisa, Largo Pontecorvo 3, 56127 Pisa, ItalyInstitute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, N. Plastira 100, 700 13 Heraklion Crete, GreeceNanocomposites of hyperbranched polymers with graphitic materials are investigated with respect to their structure and thermal properties as well as the dynamics of the polymer probing the effect of the different intercalated or exfoliated structure. Three generations of hyperbranched polyester polyols are mixed with graphite oxide (GO) and the favorable interactions between the polymers and the solid surfaces lead to intercalated structure. The thermal transitions of the confined chains are suppressed, whereas their dynamics show similarities and differences with the dynamics of the neat polymers. The three relaxation processes observed for the neat polymers are observed in the nanohybrids as well, but with different temperature dependencies. Thermal reduction of the graphite oxide in the presence of the polymer to produce reduced graphite oxide (rGO) reveals an increase in the reduction temperature, which is accompanied by decreased thermal stability of the polymer. The de-oxygenation of the graphite oxide leads to the destruction of the intercalated structure and to the dispersion of the rGO layers within the polymeric matrix because of the modification of the interactions between the polymer chains and the surfaces. A significant increase in the conductivity of the resulting nanocomposites, in comparison to both the polymers and the intercalated nanohybrids, indicates the formation of a percolated rGO network.https://www.mdpi.com/2073-4360/13/7/1008hyperbranched polymersgraphite oxideintercalationdynamicsthermal reductionreduced graphite oxide |
| spellingShingle | Kiriaki Chrissopoulou Krystalenia Androulaki Massimiliano Labardi Spiros H. Anastasiadis Static and Dynamic Behavior of Polymer/Graphite Oxide Nanocomposites before and after Thermal Reduction Polymers hyperbranched polymers graphite oxide intercalation dynamics thermal reduction reduced graphite oxide |
| title | Static and Dynamic Behavior of Polymer/Graphite Oxide Nanocomposites before and after Thermal Reduction |
| title_full | Static and Dynamic Behavior of Polymer/Graphite Oxide Nanocomposites before and after Thermal Reduction |
| title_fullStr | Static and Dynamic Behavior of Polymer/Graphite Oxide Nanocomposites before and after Thermal Reduction |
| title_full_unstemmed | Static and Dynamic Behavior of Polymer/Graphite Oxide Nanocomposites before and after Thermal Reduction |
| title_short | Static and Dynamic Behavior of Polymer/Graphite Oxide Nanocomposites before and after Thermal Reduction |
| title_sort | static and dynamic behavior of polymer graphite oxide nanocomposites before and after thermal reduction |
| topic | hyperbranched polymers graphite oxide intercalation dynamics thermal reduction reduced graphite oxide |
| url | https://www.mdpi.com/2073-4360/13/7/1008 |
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