Flow field visualization of entangled polybutadiene solutions under nonlinear viscoelastic flow conditions
Using self-designed particle visualization instrumentation, startup shear and step-strain tests were conducted under a series of systematically varied rheological and geometrical conditions, and the velocity profiles in three different well-entangled polybutadiene/oligomer solutions were obtained. F...
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| Format: | Article |
| Language: | en_US |
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American Institute of Physics (AIP)
2015
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| Online Access: | http://hdl.handle.net/1721.1/97682 https://orcid.org/0000-0001-8323-2779 |
| _version_ | 1826188550730678272 |
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| author | Li, Yanfei Hu, Miao McKenna, Gregory B. Dimitriou, Christopher J. McKinley, Gareth H. Mick, Rebecca M. Venerus, David C. Archer, Lynden A. |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Li, Yanfei Hu, Miao McKenna, Gregory B. Dimitriou, Christopher J. McKinley, Gareth H. Mick, Rebecca M. Venerus, David C. Archer, Lynden A. |
| author_sort | Li, Yanfei |
| collection | MIT |
| description | Using self-designed particle visualization instrumentation, startup shear and step-strain tests were conducted under a series of systematically varied rheological and geometrical conditions, and the velocity profiles in three different well-entangled polybutadiene/oligomer solutions were obtained. For startup shear tests, in the regime of entanglement densities up to 89 and nominal reptation Weissenberg numbers up to 18.6, we generally observe either wall slip and a linear velocity/strain profile or simply the linear profile with no wall slip unless a massive edge fracture or instability has occurred in the sample. Meanwhile, step-strain tests conducted at similar and higher step Weissenberg numbers revealed little particle motion upon cessation. These results lead us to a conclusion that there is no compelling evidence of shear banding or nonquiescent relaxation in the range of entanglement density and Wi investigated; we interpret the results to imply that any observed banding probably correlates with edge effects. |
| first_indexed | 2024-09-23T08:01:26Z |
| format | Article |
| id | mit-1721.1/97682 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:01:26Z |
| publishDate | 2015 |
| publisher | American Institute of Physics (AIP) |
| record_format | dspace |
| spelling | mit-1721.1/976822022-09-30T01:44:30Z Flow field visualization of entangled polybutadiene solutions under nonlinear viscoelastic flow conditions Li, Yanfei Hu, Miao McKenna, Gregory B. Dimitriou, Christopher J. McKinley, Gareth H. Mick, Rebecca M. Venerus, David C. Archer, Lynden A. Massachusetts Institute of Technology. Department of Mechanical Engineering Dimitriou, Christopher J. McKinley, Gareth H. Using self-designed particle visualization instrumentation, startup shear and step-strain tests were conducted under a series of systematically varied rheological and geometrical conditions, and the velocity profiles in three different well-entangled polybutadiene/oligomer solutions were obtained. For startup shear tests, in the regime of entanglement densities up to 89 and nominal reptation Weissenberg numbers up to 18.6, we generally observe either wall slip and a linear velocity/strain profile or simply the linear profile with no wall slip unless a massive edge fracture or instability has occurred in the sample. Meanwhile, step-strain tests conducted at similar and higher step Weissenberg numbers revealed little particle motion upon cessation. These results lead us to a conclusion that there is no compelling evidence of shear banding or nonquiescent relaxation in the range of entanglement density and Wi investigated; we interpret the results to imply that any observed banding probably correlates with edge effects. National Science Foundation (U.S.) (Grant DMR-0934305) 2015-07-06T17:53:51Z 2015-07-06T17:53:51Z 2013-08 2013-07 Article http://purl.org/eprint/type/JournalArticle 01486055 1520-8516 http://hdl.handle.net/1721.1/97682 Li, Yanfei, Miao Hu, Gregory B. McKenna, Christopher J. Dimitriou, Gareth H. McKinley, Rebecca M. Mick, David C. Venerus, and Lynden A. Archer. “Flow Field Visualization of Entangled Polybutadiene Solutions Under Nonlinear Viscoelastic Flow Conditions.” J. Rheol. 57, no. 5 (2013): 1411. https://orcid.org/0000-0001-8323-2779 en_US http://dx.doi.org/10.1122/1.4816735 Journal of Rheology Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf American Institute of Physics (AIP) MIT web domain |
| spellingShingle | Li, Yanfei Hu, Miao McKenna, Gregory B. Dimitriou, Christopher J. McKinley, Gareth H. Mick, Rebecca M. Venerus, David C. Archer, Lynden A. Flow field visualization of entangled polybutadiene solutions under nonlinear viscoelastic flow conditions |
| title | Flow field visualization of entangled polybutadiene solutions under nonlinear viscoelastic flow conditions |
| title_full | Flow field visualization of entangled polybutadiene solutions under nonlinear viscoelastic flow conditions |
| title_fullStr | Flow field visualization of entangled polybutadiene solutions under nonlinear viscoelastic flow conditions |
| title_full_unstemmed | Flow field visualization of entangled polybutadiene solutions under nonlinear viscoelastic flow conditions |
| title_short | Flow field visualization of entangled polybutadiene solutions under nonlinear viscoelastic flow conditions |
| title_sort | flow field visualization of entangled polybutadiene solutions under nonlinear viscoelastic flow conditions |
| url | http://hdl.handle.net/1721.1/97682 https://orcid.org/0000-0001-8323-2779 |
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