Dynamic viscoelasticity of PUF under small strain and prediction of dynamic viscoelasticity in a wide frequency range

ABSTRACT The dynamic viscoelasticity of polyurethane fiber (PUF) under small strain was studied with dynamic mechanical analysis and differential scanning calorimetry, and its viscoelasticity was predicted in a wide frequency range. The results revealed that the loss factor (tan δ) was about 0.05 an...

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Bibliographic Details
Published in:Journal of applied polymer science 2019-02, Vol.136 (7), p.n/a
Main Authors: You, Gexin, Wang, Wenchao, Mei, Shuqin, Zhou, Xiuwen
Format: Article
Language:English
Subjects:
apparent activation energy
Dynamic mechanical analysis
dynamic viscoelasticity
Elastomers
Loss modulus
Materials science
Polymers
Polyurethane resins
Predictions
PUF
Storage modulus
Strain
Superposition (mathematics)
Temperature
Viscoelasticity
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Summary:ABSTRACT The dynamic viscoelasticity of polyurethane fiber (PUF) under small strain was studied with dynamic mechanical analysis and differential scanning calorimetry, and its viscoelasticity was predicted in a wide frequency range. The results revealed that the loss factor (tan δ) was about 0.05 and the phase angle (δ) was 2.86°, very close to the δ of a perfect elastomer in the range from −100°C to −80°C. The master curves superimposed by time‐temperature superposition (TTS), the frequency range of the storage modulus master curve spanned 17 orders of magnitude from 10−7 Hz to 1010 Hz, and the loss modulus master curve spanned 13 orders of magnitude from 10−3 Hz to 1010 Hz. The apparent activation energy of the soft segment relaxation decreased with increasing temperature in the range from −70 to −26°C. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47070.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.47070