Rheological Study of Poly(lactic) Acid Nanocomposites with Carbon Nanotubes and Graphene Additives as a Tool for Materials Characterization for 3D Printing Application
In the last decades, one of the most critical issues concerning the control on the processing, structure and properties of nanocomposites is related to the dispersion of nanofiller in the polymer matrix and internal interactions resulting in percolation. In this study, we investigate the rheological...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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De Gruyter
2018-10-01
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| Series: | Applied Rheology |
| Subjects: | |
| Online Access: | https://doi.org/10.3933/applrheol-28-54014 |
| _version_ | 1818587783419133952 |
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| author | Ivanova Radost Kotsilkova Rumiana |
| author_facet | Ivanova Radost Kotsilkova Rumiana |
| author_sort | Ivanova Radost |
| collection | DOAJ |
| description | In the last decades, one of the most critical issues concerning the control on the processing, structure and properties of nanocomposites is related to the dispersion of nanofiller in the polymer matrix and internal interactions resulting in percolation. In this study, we investigate the rheological behavior in oscillatory and steady shear flow of poly(lactic) acid based nanocomposites incorporating 0 – 12 wt% graphene nanoplates (GNP) and multi-walled carbon nanotubes (OH-MWCNT). The effect of the filler contents and aspect ratio on the viscosity and viscoelastic response is evaluated. Three rheological techniques are used for estimation of rheological percolation threshold. Due to different aspect ratio and state of dispersion of GNP and MWCNTs the percolation threshold differs significantly for both compositions ϕp ≤ 1.5 wt% for MWCNT/PLA and ϕp ≤ 5 wt% for GNP/PLA. The larger the aspect ratio of nanofiller, the lower is the rheological percolation threshold. The visualized structure by TEM analysis confirms the rheological predictions for both type composites. The index of flow was estimated by the power law slope of the flow curves and a better dispersion was assumed for MWCNTs in comparison with GNPs due to the surface modification. Based on the rheological percolation threshold and the flow index, nanocomposites were classified in three groups: Newtonian, percolated composites and elastic solids. Both characteristics are used to select the printing parameters for the three groups of nanocomposites, suitable for fused deposition modeling (FDM). |
| first_indexed | 2024-12-16T09:14:21Z |
| format | Article |
| id | doaj.art-22dd7eae82eb4b2b8121a25cdf675e54 |
| institution | Directory Open Access Journal |
| issn | 1617-8106 |
| language | English |
| last_indexed | 2024-12-16T09:14:21Z |
| publishDate | 2018-10-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Applied Rheology |
| spelling | doaj.art-22dd7eae82eb4b2b8121a25cdf675e542022-12-21T22:36:56ZengDe GruyterApplied Rheology1617-81062018-10-0128510.3933/applrheol-28-54014Rheological Study of Poly(lactic) Acid Nanocomposites with Carbon Nanotubes and Graphene Additives as a Tool for Materials Characterization for 3D Printing ApplicationIvanova Radost0Kotsilkova Rumiana1Open Laboratory on Experimental Micro and Nano Mechanics, Institute of Mechanics, Bulgarian Academy of Sciences, Akad. G. Bonchev Street Block 4, 1113Sofia, BulgariaOpen Laboratory on Experimental Micro and Nano Mechanics, Institute of Mechanics, Bulgarian Academy of Sciences, Akad. G. Bonchev Street Block 4, 1113Sofia, BulgariaIn the last decades, one of the most critical issues concerning the control on the processing, structure and properties of nanocomposites is related to the dispersion of nanofiller in the polymer matrix and internal interactions resulting in percolation. In this study, we investigate the rheological behavior in oscillatory and steady shear flow of poly(lactic) acid based nanocomposites incorporating 0 – 12 wt% graphene nanoplates (GNP) and multi-walled carbon nanotubes (OH-MWCNT). The effect of the filler contents and aspect ratio on the viscosity and viscoelastic response is evaluated. Three rheological techniques are used for estimation of rheological percolation threshold. Due to different aspect ratio and state of dispersion of GNP and MWCNTs the percolation threshold differs significantly for both compositions ϕp ≤ 1.5 wt% for MWCNT/PLA and ϕp ≤ 5 wt% for GNP/PLA. The larger the aspect ratio of nanofiller, the lower is the rheological percolation threshold. The visualized structure by TEM analysis confirms the rheological predictions for both type composites. The index of flow was estimated by the power law slope of the flow curves and a better dispersion was assumed for MWCNTs in comparison with GNPs due to the surface modification. Based on the rheological percolation threshold and the flow index, nanocomposites were classified in three groups: Newtonian, percolated composites and elastic solids. Both characteristics are used to select the printing parameters for the three groups of nanocomposites, suitable for fused deposition modeling (FDM).https://doi.org/10.3933/applrheol-28-54014carbon nanotubesgraphene nanoplatespoly(lactic)acidviscoelastic responserheological percolation thresholdindex of flowprinting parameters |
| spellingShingle | Ivanova Radost Kotsilkova Rumiana Rheological Study of Poly(lactic) Acid Nanocomposites with Carbon Nanotubes and Graphene Additives as a Tool for Materials Characterization for 3D Printing Application Applied Rheology carbon nanotubes graphene nanoplates poly(lactic)acid viscoelastic response rheological percolation threshold index of flow printing parameters |
| title | Rheological Study of Poly(lactic) Acid Nanocomposites with Carbon Nanotubes and Graphene Additives as a Tool for Materials Characterization for 3D Printing Application |
| title_full | Rheological Study of Poly(lactic) Acid Nanocomposites with Carbon Nanotubes and Graphene Additives as a Tool for Materials Characterization for 3D Printing Application |
| title_fullStr | Rheological Study of Poly(lactic) Acid Nanocomposites with Carbon Nanotubes and Graphene Additives as a Tool for Materials Characterization for 3D Printing Application |
| title_full_unstemmed | Rheological Study of Poly(lactic) Acid Nanocomposites with Carbon Nanotubes and Graphene Additives as a Tool for Materials Characterization for 3D Printing Application |
| title_short | Rheological Study of Poly(lactic) Acid Nanocomposites with Carbon Nanotubes and Graphene Additives as a Tool for Materials Characterization for 3D Printing Application |
| title_sort | rheological study of poly lactic acid nanocomposites with carbon nanotubes and graphene additives as a tool for materials characterization for 3d printing application |
| topic | carbon nanotubes graphene nanoplates poly(lactic)acid viscoelastic response rheological percolation threshold index of flow printing parameters |
| url | https://doi.org/10.3933/applrheol-28-54014 |
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