Citation: Wen-ze Li, Yan-hua Niu, Chen-ting Zhou, Huan Luo, Guang-xian Li. Crystallization Kinetics and the Fine Morphological Evolution of Poly(ethylene oxide)/Ionic Liquid Mixtures[J]. Chinese Journal of Polymer Science, ;2017, 35(11): 1402-1414. doi: 10.1007/s10118-017-1997-3 shu

Crystallization Kinetics and the Fine Morphological Evolution of Poly(ethylene oxide)/Ionic Liquid Mixtures

College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering of China, Sichuan University, Chengdu 610065, China

Corresponding author: Yan-hua Niu, yhniu@scu.edu.cn
Received Date: 6 March 2017
Revised Date: 27 May 2017
Accepted Date: 16 June 2017

Fund Project: the National Natural Science Foundation of China 51573115the National Natural Science Foundation of China 51421061

The overall crystallization kinetics and spherulite morphologies of miscible poly(ethylene oxide) (PEO)/1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM] [PF₆]) mixtures were studied by differential scanning calorimetry (DSC), polarized optical microscopy (POM) and rheological measurements. The finer crystal structures were further detected by wide angle X-ray diffraction (WAXD) and small angle X-ray scattering (SAXS). Crystallization of PEO is largely suppressed by[BMIM] [PF₆] addition especially at higher ionic liquid (IL) concentrations above 20 wt%. Both the overall crystallization rate and the spherulite growth decrease with the increase of IL content and crystallization temperature; however, the crystallization mechanism keeps unchanged as evidenced by the similar Avrami exponent n and WAXD results. The addition of[BMIM] [PF₆] could induce more nuclei to some extent, but the induction time of crystallization is evidently prolonged, and a linear to non-linear transition of the spherulite growth (R ∝ t to R ∝ t^1/2) can be observed. At higher IL concentration, the spherulite texture changes apparently from particular serrated to branch surface due to the diffusion-controlled growth and the dilution effect, which also as a main factor contributes to the increasing trend of the long period of crystals.
- PEO,
- [BMIM] [PF₆],
- Crystallization kinetics,
- Spherulite morphologies
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