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Dynamic viscoelasticity of PUF under small strain and prediction of dynamic viscoelasticity in a wide frequency range
Author(s) -
You Gexin,
Wang Wenchao,
Mei Shuqin,
Zhou Xiuwen
Publication year - 2019
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.47070
Subject(s) - viscoelasticity , dynamic mechanical analysis , dynamic modulus , materials science , loss factor , time–temperature superposition , differential scanning calorimetry , composite material , relaxation (psychology) , range (aeronautics) , atmospheric temperature range , activation energy , elastomer , modulus , polymer , thermodynamics , physics , chemistry , psychology , social psychology , optoelectronics , organic chemistry , dielectric
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 10 10 Hz, and the loss modulus master curve spanned 13 orders of magnitude from 10 −3 Hz to 10 10 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.
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