Effect of Graphite Nanosheets on Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)
The influence of different contents, 0.25, 0.50, and 1.00 wt%, of graphite nanosheets (GNS) on the properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) nanocomposites obtained by solution casting method has been studied. GNS were prepared by three steps: intercalation (chemical exfoliat...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | International Journal of Polymer Science |
| Online Access: | http://dx.doi.org/10.1155/2017/9316761 |
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| author | Larissa Stieven Montagna Thaís Larissa do Amaral Montanheiro João Paulo Barros Machado Fábio Roberto Passador Ana Paula Lemes Mirabel Cerqueira Rezende |
| author_facet | Larissa Stieven Montagna Thaís Larissa do Amaral Montanheiro João Paulo Barros Machado Fábio Roberto Passador Ana Paula Lemes Mirabel Cerqueira Rezende |
| author_sort | Larissa Stieven Montagna |
| collection | DOAJ |
| description | The influence of different contents, 0.25, 0.50, and 1.00 wt%, of graphite nanosheets (GNS) on the properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) nanocomposites obtained by solution casting method has been studied. GNS were prepared by three steps: intercalation (chemical exfoliation), expansion (thermal treatment), and the GNS obtainment (physical treatment by ultrasonic exfoliation). X-ray diffraction (XRD), Raman spectroscopy, and field emission gun-scanning electron microscopy (FE-SEM) showed that the physical, chemical, and thermal treatments preserved the graphite sheets structure. XRD and Raman results also showed that GNS were dispersed in the PHBV matrix. The degree of crystallinity (Xc) of the nanocomposites did not change when the graphite nanosheets were added. However, the GNS acted as nucleation agent for crystallization; that is, in the second heating the samples containing GNS showed two melting peaks. The addition the GNS did not change the thermal stability of the PHBV. |
| format | Article |
| id | doaj-art-7eb17b286a1749ea9c7e91a4cbd523c6 |
| institution | Kabale University |
| issn | 1687-9422 1687-9430 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Polymer Science |
| spelling | doaj-art-7eb17b286a1749ea9c7e91a4cbd523c62025-02-03T05:51:22ZengWileyInternational Journal of Polymer Science1687-94221687-94302017-01-01201710.1155/2017/93167619316761Effect of Graphite Nanosheets on Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)Larissa Stieven Montagna0Thaís Larissa do Amaral Montanheiro1João Paulo Barros Machado2Fábio Roberto Passador3Ana Paula Lemes4Mirabel Cerqueira Rezende5Institute of Science and Technology, Federal University of São Paulo (UNIFESP), Group of Polymers and Macromolecules, São José dos Campos, SP, BrazilInstitute of Science and Technology, Federal University of São Paulo (UNIFESP), Group of Polymers and Macromolecules, São José dos Campos, SP, BrazilNational Institute for Space Research (INPE), Associated Laboratory of Sensors and Materials (LAS), São José dos Campos, SP, BrazilInstitute of Science and Technology, Federal University of São Paulo (UNIFESP), Group of Polymers and Macromolecules, São José dos Campos, SP, BrazilInstitute of Science and Technology, Federal University of São Paulo (UNIFESP), Group of Polymers and Macromolecules, São José dos Campos, SP, BrazilInstitute of Science and Technology, Federal University of São Paulo (UNIFESP), Group of Polymers and Macromolecules, São José dos Campos, SP, BrazilThe influence of different contents, 0.25, 0.50, and 1.00 wt%, of graphite nanosheets (GNS) on the properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) nanocomposites obtained by solution casting method has been studied. GNS were prepared by three steps: intercalation (chemical exfoliation), expansion (thermal treatment), and the GNS obtainment (physical treatment by ultrasonic exfoliation). X-ray diffraction (XRD), Raman spectroscopy, and field emission gun-scanning electron microscopy (FE-SEM) showed that the physical, chemical, and thermal treatments preserved the graphite sheets structure. XRD and Raman results also showed that GNS were dispersed in the PHBV matrix. The degree of crystallinity (Xc) of the nanocomposites did not change when the graphite nanosheets were added. However, the GNS acted as nucleation agent for crystallization; that is, in the second heating the samples containing GNS showed two melting peaks. The addition the GNS did not change the thermal stability of the PHBV.http://dx.doi.org/10.1155/2017/9316761 |
| spellingShingle | Larissa Stieven Montagna Thaís Larissa do Amaral Montanheiro João Paulo Barros Machado Fábio Roberto Passador Ana Paula Lemes Mirabel Cerqueira Rezende Effect of Graphite Nanosheets on Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) International Journal of Polymer Science |
| title | Effect of Graphite Nanosheets on Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) |
| title_full | Effect of Graphite Nanosheets on Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) |
| title_fullStr | Effect of Graphite Nanosheets on Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) |
| title_full_unstemmed | Effect of Graphite Nanosheets on Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) |
| title_short | Effect of Graphite Nanosheets on Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) |
| title_sort | effect of graphite nanosheets on properties of poly 3 hydroxybutyrate co 3 hydroxyvalerate |
| url | http://dx.doi.org/10.1155/2017/9316761 |
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