Transient extensional viscosity from a rotational shear rheometer using fiber‐windup technique
作者:
Mahesh Padmanabhan,
Leo J. Kasehagen,
Christopher W. Macosko,
期刊:
Journal of Rheology
(AIP Available online 1996)
卷期:
Volume 40,
issue 4
页码: 473-481
ISSN:0148-6055
年代: 1996
DOI:10.1122/1.550792
出版商: The Society of Rheology
关键词: Extensional viscosity;Fiber windup, for extensional viscosity;VISCOSITY;TRANSIENTS;ISOBUTYL RADICALS;POLYETHYLENES;MEASURING METHODS;MEASURING INSTRUMENTS
数据来源: AIP
摘要:
The fiber‐windup technique, developed by Macosko and Lorntson [SPE Tech. Papers19, 461–467 (1973)] for rotational shear rheometers, was re‐examined to obtain transient uniaxial extensional viscosity data. Macosko and Lorntson used a special force transducer to measure the tension in the filament being pulled. In contrast, in this study commercial rotational shear rheometers (Rheometrics Mechanical Spectrometer‐800 and Rheometrics Fluids Spectrometer‐II) with torque transducers were used to obtain the extensional viscosity. One end of the sample is clamped, while the other end is wound around a drum at a constant rotational speed, to achieve a given extension rate. Tests were conducted with a polyisobutylene sample at room temperature to verify reproducibility and were compared with published studies. Results for polyisobutylene and IUPAC‐X low density polyethylene were found to be in good agreement with published results. Hencky strains of up to 6 could be achieved. The technique can provide valuable extensional viscosity data for high viscosity liquids.
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