High strain extensional rheometry of polymer melts: Revisiting and improving the Meissner design
| Autor: | Patrick J. Harris, Ricardo J. E. Andrade, João M. Maia |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
chemistry.chemical_classification
Materials science Deformation (mechanics) Rheometry Mechanical Engineering Rheometer Flow (psychology) Polymer Condensed Matter Physics Rheology Natural rubber chemistry Mechanics of Materials visual_art visual_art.visual_art_medium General Materials Science Extensional viscosity Composite material |
| Zdroj: | Journal of Rheology. 58:869-890 |
| ISSN: | 1520-8516 0148-6055 |
| DOI: | 10.1122/1.4875349 |
| Popis: | A new extensional rheometer limited in achievable strain only by sample rupture is presented. The rheometer is based on the Meissner design of two pairs of counter-rotating rollers pulling a sample of fixed length but is small enough to fit inside the oven of a standard rotational rheometer and thus is dubbed the Meissner Extensional Rheometry Accessory (MERA). The true strain rate is calculated by visually accessing the sample during deformation using a high-speed digital camera. Extensional experiments were performed on three materials representing a wide range expected rheological behavior, a styrene-butadiene rubber blend, a linear polystyrene, and a branched low-density polyethylene. The MERA was able to accurately replicate the results of the well-known Sentmanat extensional rheometer (SER) design in terms of onset of strain-hardening and absolute transient extensional viscosity values. However, due to its design, it was possible to achieve homogeneous extensional flow up to real Hencky strains in e... |
| Databáze: | OpenAIRE |
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