Rheological Link Between Polymer Melts with a High Molecular Weight Tail and Enhanced Formation of Shish-Kebabs
| Autor: | Ole Hassager, Kell Mortensen, Dimitris Vlassopoulos, Daniele Parisi, Sara Lindeblad Wingstrand, Bo Shen, Julie Kornfield |
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| Rok vydání: | 2022 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Organic Chemistry 02 engineering and technology Polymer 021001 nanoscience & nanotechnology 01 natural sciences Extensional definition Characterization (materials science) Inorganic Chemistry Stress (mechanics) Characterization methods chemistry Rheology Chemical engineering Creep 0103 physical sciences Materials Chemistry Molar mass distribution Composite material 010306 general physics 0210 nano-technology |
| Zdroj: | Wingstrand, S L, Shen, B, Kornfield, J A, Mortensen, K, Parisi, D, Vlassopoulos, D & Hassager, O 2017, ' Rheological Link Between Polymer Melts with a High Molecular Weight Tail and Enhanced Formation of Shish-Kebabs ', A C S Macro Letters, vol. 6, pp. 1268-1273 . https://doi.org/10.1021/acsmacrolett.7b00718 |
| ISSN: | 2161-1653 |
| DOI: | 10.1021/acsmacrolett.7b00718 |
| Popis: | Presence of an ultra high molecular weight (UHMw) fraction in flowing polymer melts is known to facilitate formation of oriented crystalline structures significantly. The UHMw fraction manifests itself as a minor tail in the molar mass distribution and is hardly detectable in the canonical characterization methods. In this study, alternatively, we demonstrate how the nonlinear extensional rheology reveals to be a very sensitive characterization tool for investigating the effect of the UHMw-tail on the structural ordering mechanism. Samples containing a UHMw-tail relative to samples without, exhibit a clear increase in extensional stress that is directly correlated with the crystalline orientation of the quenched samples. Extensional rheology, particularly, in combination with linear creep measurements, thus, enables the conformational evolution of the UHMw-tail to be studied and linked to the enhanced formation of oriented structures. |
| Databáze: | OpenAIRE |
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