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Crystallization kinetics and the fine morphological evolution of poly(ethylene oxide)/ionic liquid mixtures

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Abstract

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.

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Authors and Affiliations

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

    Wen-ze Li, Yan-hua Niu  (牛艳华), Chen-ting Zhou, Huan Luo & Guang-xian Li

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  1. Wen-ze Li
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  2. Yan-hua Niu  (牛艳华)
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  3. Chen-ting Zhou
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  4. Huan Luo
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  5. Guang-xian Li
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Corresponding author

Correspondence to Yan-hua Niu  (牛艳华).

Additional information

This work was financially supported by the National Natural Science Foundation of China (Nos. 51573115 and 51421061).

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Li, Wz., Niu, Yh., Zhou, Ct. et al. Crystallization kinetics and the fine morphological evolution of poly(ethylene oxide)/ionic liquid mixtures. Chin J Polym Sci 35, 1402–1414 (2017). https://doi.org/10.1007/s10118-017-1997-3

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  • DOI: https://doi.org/10.1007/s10118-017-1997-3

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