a.Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
b.CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
c.University of Chinese Academy of Sciences, Beijing 100049, China
d.School of Materials Science & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China
gmliu@iccas.ac.cn
收稿:2021-09-27,
修回:2021-10-26,
录用:2021-10-28,
网络首发:2022-01-11,
纸质出版:2022-03-01
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Zhang, C. B.; Wang, L.; Yang, B.; Zhao, H.; Liu, G. M.; Wang, D. J. Stress-induced solid-solid crystal transition in trans-1,4-polyisoprene. Chinese J. Polym. Sci. 2022, 40, 256–265
Chun-Bo Zhang, Lei Wang, Bo Yang, et al. Stress-induced Solid-Solid Crystal Transition in
Zhang, C. B.; Wang, L.; Yang, B.; Zhao, H.; Liu, G. M.; Wang, D. J. Stress-induced solid-solid crystal transition in trans-1,4-polyisoprene. Chinese J. Polym. Sci. 2022, 40, 256–265 DOI: 10.1007/s10118-022-2659-7.
Chun-Bo Zhang, Lei Wang, Bo Yang, et al. Stress-induced Solid-Solid Crystal Transition in
The polymorphic transition of
trans
-1
4-polyisoprene (TPI) during stretching was investigated by
in situ
wide-angle X-ray diffraction and Fourier transform infrared spectroscopy. The influences of the initial structure
stretching temperature
and strain rate on the contents of different crystal modifications (
α
β
) were explored. The results confirm that the
α
-
β
transition occurs during stretching of TPI that only contains
α
crystal (
α
-TPI). When the stress is relaxed
the
β
crystal formed during stretching remains
which indicates that the transition is irreversible. On the other hand
stretching of TPI that only contains
β
crystal (
β
-TPI) results in orientated
β
crystal. No
β
-
α
transition occurs during stretching. The different structures of stretched
α
-TPI and
β
-TPI exclude the previously proposed “melting-recrystallization mechanism”. The
α
-
β
transition depends significantly on temperature and strain rate
indicating the transition is governed both by thermodynamics and kinetics. Our results support a solid-solid transition mechanism rather than a melting-recrystallization mechanism. The irreversible nature of the transition is attributed to the metastability of the
β
phase in the unstretched state. Different from the “
β
phases” that appear in polymers with stress-induced reversible transitions
e.g.
poly(butylene terephthalate) and poly(butylene succinate)
the stability of
β
phase in TPI is high that can be long-lived. The strain rate dependence of
α
-
β
transition hinders the determination of critical stress for the transition. It further indicates that the local stress within the sample is more heterogeneous at higher strain rates.
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