State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
Yong-Feng Men, E-mail men@ciac.ac.cn
收稿:2017-08-22,
录用:2017-10-7,
网络首发:2018-01-29,
纸质出版:2018-06
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Hai Wang, Chun-Ji Wu, Dong-Mei Cui, 等. Equilibrium Crystallization Temperature of Syndiotactic Polystyrene
Hai Wang, Chun-Ji Wu, Dong-Mei Cui, et al. Equilibrium Crystallization Temperature of Syndiotactic Polystyrene
Hai Wang, Chun-Ji Wu, Dong-Mei Cui, 等. Equilibrium Crystallization Temperature of Syndiotactic Polystyrene
Hai Wang, Chun-Ji Wu, Dong-Mei Cui, et al. Equilibrium Crystallization Temperature of Syndiotactic Polystyrene
The crystallization behavior of syndiotactic polystyrene (sPS)
γ
form undergoing annealing at various temperatures was investigated using the thermodynamic phase diagram based on Strobl's crystallization theory. On the basis of the differential scanning calorimetric results
it was observed that
γ
form melt-recrystallization occurred at a higher temperature with the increasing lamellar thickness
which resulted from the pre-annealing at the elevating temperature after acetone induced crystallization. Further temperature dependent small-angle X-ray scattering (SAXS) measurement revealed the evolution of the
γ
form lamellae upon heating until phase transition
involving three different regimes:lamellae stable region (25-90℃)
melt-recrystallization region (90-185℃) and pre-phase transition region (185-195℃). As a result
recrystallization line
equilibrium recrystallization line and melting line were developed for the sPS
γ
form crystallization process. Since the melt of
γ
form involved a
γ
-to-
α
/
β
form phase transition
the melting line was also denoted as the phase transition line in this special case. Therefore
the equilibrium crystallization temperature and melting (phase transition) temperatures were determined at around 390 and 220℃ on the basis of the thermodynamic phase diagram of the sPS
γ
form.
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