Industrial Use of Rheometers

Dealy, John M.; Wissbrun, Kurt F.

doi:10.1007/978-94-009-2163-4_19

Cited by 2 publications

(1 citation statement)

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“…Capillary rheometer is one of the most important instruments in testing the rheological properties of polymers, especially in high shear rates tests, and it is also extensively used in basic science and industrial applications. Small scale measurements on capillary rheometer are usually carried out to ensure the quality of products . Viscosity is the dominant factor among all rheological properties to cause severe effects on polymer melting flow capability in processing and molding.…”

Section: Introductionmentioning

confidence: 99%

Effects of stick–slip transition on polymer melt apparent shear viscosity measurement

Zhang

Song

Kan

et al. 2019

J of Applied Polymer Sci

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A twin‐bore capillary rheometer is used for the apparent shear viscosity measurement of commercial polyolefin melts based on Ostwald‐de Waele model. The effects of stick–slip transition of linear low‐density polyethylene (LLDPE) and high‐density polyethylene (HDPE) are investigated. The maximum error of apparent shear viscosity calculated by corrected shear rate is 23% when the stick–slip transition occurs. Based on the entanglement‑disentanglement theory, a schematic diagram for shear stress curve containing stick–slip transition is presented to illustrate polymer melt flow in capillary. In this study, the critical stress at the beginning of stick–slip transition at 220 °C is 23.01 kPa higher than that at 190 °C, and why it increases with increasing temperature is discussed with a molecular mechanism in combination with entropy elasticity and entanglement‑disentanglement theory. Through the analysis of ULDPE, PS, EVA, and K‐Resin, it can be found that short branches or side groups are helpful to avoid the stick–slip transition. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48230.

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Section: Introductionmentioning

confidence: 99%