Influence of crystallization on molecular dynamics of the amorphous phase in poly(ε-caprolactone) and poly(ε-caprolactone)/LiClO4 complexes investigated by dielectric relaxation spectroscopy

Yao Zhang, Zhijie Zhang, Hongfei Li, Donghong Yu, Yingrui Shang, Lijia An, Shichun Jiang

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Abstract

The dielectric relaxation spectroscopy results indicate that the relaxation peak of PCL for pure PCL and PCL/ LiClO4 complexes shifts to a lower frequency with increasing crystallization temperature, while the amorphous, condensed structure of PCL for pure PCL and PCL/LiClO4 complexes is slightly affected by crystallization temperature. These findings were obtained from small-angle X-ray scattering (SAXS) measurements. To further understand the effect of crystallization temperature on the relaxation behavior of PCL and PCL/ LiClO4 complexes, the isothermal crystallization process of PCL and PCL/LiClO4was probed in situ by dielectric spectra measurement. The analysis indicated that the relaxation dynamics for pure PCL and PCL/LiClO4 complexes decrease continuously during the isothermal crystallization process, even at the crystallization induction period. This paper presents a detailed discussion of the crystallization mechanisms of the PCL and PCL/LiClO4 complexes, and the probable explanation as to the effect of crystallization temperature on the relaxation dynamics of PCL and PCL/LiClO4.

Original languageEnglish
Article number312
JournalJournal of Polymer Research
Volume20
Issue number12
DOIs
StatePublished - Dec 2013
Externally publishedYes

Funding

Acknowledgement This work was supported by the National Natural Science Foundation of China (20974077, 51073157, 51173130, 21274149) and the Special Funds for National Basic Research Program of China (2010CB631102).

Keywords

  • Crystallizationmechanism
  • Dielectric relaxation spectroscopy
  • PCL/LiClO complexes

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