Modeling the viscoelasticity of polyetherimide |
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Authors: | Qi Wu Tomotaka Ogasawara Nobuhiro Yoshikawa Hongzhou Zhai |
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Affiliation: | 1. Institute of Industrial Science, University of Tokyo, 4‐6‐1 Komaba, Meguro‐ku, Tokyo, Japan;2. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Yudao Street 29, Nanjing, China |
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Abstract: | Viscoelasticity is a mechanical phenomenon where the material modulus varies with time and temperature. Modern experimental methods can determine material properties within certain time and temperature ranges, but modeling the viscoelastic behavior remains challenging, mainly because the data processing is complex and different materials have distinct properties. Using polyetherimide as an example and based on the change in the secondary bonds of polyetherimide in different viscoelastic stages, we proposed a new shift factor model in Arrhenius format with alterable activation energy. We also used two methods based on nonlinear least squares to obtain the Maxwell model of the polyetherimide, and we then used a novel method integrated with Laplace transforms and partial fraction decomposition to convert the Maxwell model into the Voigt model. The results of our model are reliable and self‐consistent, showing its potential for modeling the viscoelasticity of other materials. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46102. |
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Keywords: | glass transition mechanical properties theory and modeling thermoplastics viscosity and viscoelasticity |
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