Raman investigations of the radiation-induced modifications in iPP-VGCNF nanocomposites: The nanofillers’ tale
Nanocomposites of isotactic polypropylene loaded by various amounts of vapor-grown carbon nanotubes ranging from 0 to 20% wt. were obtained by extrusion. Raman investigations on these nanocomposites are reported. The nanocomposites were irradiated using a 60Co, with an integral dose of 1 kGy/h up to...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-10-01
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| Series: | Carbon Trends |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2667056921000961 |
| _version_ | 1818969389255360512 |
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| author | Dorina Magdalena Chipara Mihail Secu Karen Lozano Corina Secu Mircea Chipara |
| author_facet | Dorina Magdalena Chipara Mihail Secu Karen Lozano Corina Secu Mircea Chipara |
| author_sort | Dorina Magdalena Chipara |
| collection | DOAJ |
| description | Nanocomposites of isotactic polypropylene loaded by various amounts of vapor-grown carbon nanotubes ranging from 0 to 20% wt. were obtained by extrusion. Raman investigations on these nanocomposites are reported. The nanocomposites were irradiated using a 60Co, with an integral dose of 1 kGy/h up to integral doses of 9 kGy, 18 kGy, and 27 kGy, in air, at room temperature. Raman measurements were performed by using a Bruker Senterra confocal Raman spectrometer operating at 785 nm. The research is focused on the information contained within the D and G Raman lines of these nanocomposites as a function of nanotube loading for various integral doses. The experimental data revealed the graduate silencing of the molecular motions assigned to the polymeric matrix due to the nanofiller and ionizing radiation.Based on experimental data, it is concluded that the positions of the D and G lines exhibit faint shifts due to the irradiation and that (on average) these shifts are consistent with the changes of the positions of D and G lines upon the increase of the loading with vapor-grown carbon nanofibers. Raman data suggest that the irradiation relaxes the pressure exerted on the nanofiller by the polymeric matrix, indicating a path to improve the physical features of polymer-carbon nanostructure nanocomposites. The research demonstrates the capability of Raman spectroscopy to sense the modifications of molecular vibrations in polymer-based nanocomposites, for both the polymeric matrix and the nanofiller. |
| first_indexed | 2024-12-20T14:19:48Z |
| format | Article |
| id | doaj.art-4fd242454c0f4da9b761db6da9d37b11 |
| institution | Directory Open Access Journal |
| issn | 2667-0569 |
| language | English |
| last_indexed | 2024-12-20T14:19:48Z |
| publishDate | 2021-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Carbon Trends |
| spelling | doaj.art-4fd242454c0f4da9b761db6da9d37b112022-12-21T19:37:56ZengElsevierCarbon Trends2667-05692021-10-015100119Raman investigations of the radiation-induced modifications in iPP-VGCNF nanocomposites: The nanofillers’ taleDorina Magdalena Chipara0Mihail Secu1Karen Lozano2Corina Secu3Mircea Chipara4Department of Physics and Astronomy, The University of Texas Rio Grande Valley, 1201W. University Drive, Edinburg, TX 78539, United StatesNational Institute for Materials Physics, Magurele, Bucharest, RomaniaDepartment of Mechanical Engineering, The University of Texas Rio Grande Valley, 1201W. University Drive, Edinburg, TX 78539, United StatesNational Institute for Materials Physics, Magurele, Bucharest, RomaniaDepartment of Physics and Astronomy, The University of Texas Rio Grande Valley, 1201W. University Drive, Edinburg, TX 78539, United States; Corresponding author.Nanocomposites of isotactic polypropylene loaded by various amounts of vapor-grown carbon nanotubes ranging from 0 to 20% wt. were obtained by extrusion. Raman investigations on these nanocomposites are reported. The nanocomposites were irradiated using a 60Co, with an integral dose of 1 kGy/h up to integral doses of 9 kGy, 18 kGy, and 27 kGy, in air, at room temperature. Raman measurements were performed by using a Bruker Senterra confocal Raman spectrometer operating at 785 nm. The research is focused on the information contained within the D and G Raman lines of these nanocomposites as a function of nanotube loading for various integral doses. The experimental data revealed the graduate silencing of the molecular motions assigned to the polymeric matrix due to the nanofiller and ionizing radiation.Based on experimental data, it is concluded that the positions of the D and G lines exhibit faint shifts due to the irradiation and that (on average) these shifts are consistent with the changes of the positions of D and G lines upon the increase of the loading with vapor-grown carbon nanofibers. Raman data suggest that the irradiation relaxes the pressure exerted on the nanofiller by the polymeric matrix, indicating a path to improve the physical features of polymer-carbon nanostructure nanocomposites. The research demonstrates the capability of Raman spectroscopy to sense the modifications of molecular vibrations in polymer-based nanocomposites, for both the polymeric matrix and the nanofiller.http://www.sciencedirect.com/science/article/pii/S2667056921000961RamanIsotactic polypropyleneVapor-grown carbon nanofibersGamma irradiationStress transferShift of the Raman Line Position |
| spellingShingle | Dorina Magdalena Chipara Mihail Secu Karen Lozano Corina Secu Mircea Chipara Raman investigations of the radiation-induced modifications in iPP-VGCNF nanocomposites: The nanofillers’ tale Carbon Trends Raman Isotactic polypropylene Vapor-grown carbon nanofibers Gamma irradiation Stress transfer Shift of the Raman Line Position |
| title | Raman investigations of the radiation-induced modifications in iPP-VGCNF nanocomposites: The nanofillers’ tale |
| title_full | Raman investigations of the radiation-induced modifications in iPP-VGCNF nanocomposites: The nanofillers’ tale |
| title_fullStr | Raman investigations of the radiation-induced modifications in iPP-VGCNF nanocomposites: The nanofillers’ tale |
| title_full_unstemmed | Raman investigations of the radiation-induced modifications in iPP-VGCNF nanocomposites: The nanofillers’ tale |
| title_short | Raman investigations of the radiation-induced modifications in iPP-VGCNF nanocomposites: The nanofillers’ tale |
| title_sort | raman investigations of the radiation induced modifications in ipp vgcnf nanocomposites the nanofillers tale |
| topic | Raman Isotactic polypropylene Vapor-grown carbon nanofibers Gamma irradiation Stress transfer Shift of the Raman Line Position |
| url | http://www.sciencedirect.com/science/article/pii/S2667056921000961 |
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