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Rheology of crosslinked entangled polymers: Shear stiffening in oscillatory shear
Author(s) -
Zhang Dongsheng,
Jiang Nan,
Chen Xiaoyan,
He Bobing
Publication year - 2020
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.48421
Subject(s) - stiffening , materials science , rheology , shear (geology) , polymer , polydimethylsiloxane , shear modulus , composite material , viscoelasticity , polymer chemistry
Polyborosiloxane (PBS) was synthesized from boric acid and hydroxyl‐terminated polydimethylsiloxane (PDMS). The oscillatory shear behavior of PBS formed by PDMS with different molecular weight was studied. The relaxation time of PBS was calculated by Doi‐Edwards model. Finally, the shear‐stiffening mechanism of reversibly crosslinked entangled polymer was obtained. Shear stiffening occurs at lower shear frequencies, which is mainly due to crosslinking bonds and friction between molecules hindering the movement of molecules. The increase in storage modulus at high frequencies is attributed to the resistance caused by entanglement in the stretching process of molecular chains. In addition, the molecular weight is greater and the degree of shear stiffening is higher. Such a conclusion is useful to further study the application of shear stiffening. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48421.