

FOLLOWUS
a.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
b.University of Science and Technology of China, Hefei 230026, China
qchen@ciac.ac.cn
Received:30 December 2021,
Revised:2022-1-20,
Accepted:28 January 2022,
Online First:25 April 2022,
Published:01 June 2022
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Zhang, J. Q.; Chen, Q. Shear-induced precursors of fibrillar crystals of poly(butene-1): a rheological study. Chinese J. Polym. Sci. 2022, 40, 618–623
Jia-Qi Zhang, Quan Chen. Shear-induced Precursors of Fibrillar Crystals of Poly(butene-1): A Rheological Study[J]. Chinese Journal of Polymer Science, 2022, 40(6): 618-623.
Zhang, J. Q.; Chen, Q. Shear-induced precursors of fibrillar crystals of poly(butene-1): a rheological study. Chinese J. Polym. Sci. 2022, 40, 618–623 DOI: 10.1007/s10118-022-2705-5.
Jia-Qi Zhang, Quan Chen. Shear-induced Precursors of Fibrillar Crystals of Poly(butene-1): A Rheological Study[J]. Chinese Journal of Polymer Science, 2022, 40(6): 618-623. DOI: 10.1007/s10118-022-2705-5.
In this study
we find that applying strong shear flow on poly(butene-1) induces formation of precursors of fibrillar crystals. The growth of the precursors is akin to the gelation process.
Strong preshear flow stretches poly(butene-1) chains to form flow-induced precursors of fibrillar crystals. The formation leads to further growth of shear/normal stress after the stress reaches the steady state. In this study
stress relaxation measurements are performed after intervals of a strong flow during which the precursors form. The small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) measurements are conducted to characterize the crystalline structure formed after the preshear and relaxation processes
each of different periods. A combination of the stress relaxation and scattering results reveal that for the precursors formed within 5 s
the stress can fully relax and the orientation of the subsequent crystals (formed upon quenching the sample at different stress levels) decays gradually with the relaxation. In comparison
for those precursors formed after 5 s
the stress hardly relaxes during ~10
4
s
and the orientation of the subsequent crystals hardly decays
suggesting that the precursors have been somehow stabilized during the shear. These features have been discussed with respect to the percolation of the precursors to form a reversible network.
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