Changes of the Molecular Mobility of Poly(<italic style="font-style: italic">ε</italic>-caprolactone) upon Drawing, Studied by Dielectric Relaxation Spectroscopy

Xiao-Yan Yang; Shao-Shuai Liu; Alexander V. Korobko; Stephen J. Picken; Nicolaas A. M. Besseling

doi:10.1007/s10118-018-2030-1

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Changes of the Molecular Mobility of Poly(ε-caprolactone) upon Drawing, Studied by Dielectric Relaxation Spectroscopy

Articles | Updated：2021-02-18

- Changes of the Molecular Mobility of Poly(ε-caprolactone) upon Drawing, Studied by Dielectric Relaxation Spectroscopy
- Chinese Journal of Polymer Science Vol. 36, Issue 5, Pages: 665-674(2018)
- Affiliations：
  
  a.Lucky Research Institute, China Lucky Group Corporation, Baoding 071054, China
  b.Department of Chemical Engineering, Delft University of Technology, 2628 BL Delft, and Dutch Polymer Institute(DPI), 5600 AX Eindhoven, the Netherlands
- Author bio：
  
  Xiao-Yan Yang, E-mail hsiaoyen_yang@hotmail.com
- Funds：
- DOI：10.1007/s10118-018-2030-1
  CLC：
- Received：19 July 2017，
  
  Accepted：30 August 2017，
  
  Online First：15 January 2018，
  
  Published：05 May 2018
- Accepted：
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Xiao-Yan Yang, Shao-Shuai Liu, Alexander V. Korobko, et al. Changes of the Molecular Mobility of Poly(ε-caprolactone) upon Drawing, Studied by Dielectric Relaxation Spectroscopy[J]. Chinese Journal of Polymer Science, 2018, 36(5): 665-674. DOI: 10.1007/s10118-018-2030-1.
DOI：

Xiao-Yan Yang, Shao-Shuai Liu, Alexander V. Korobko, et al. Changes of the Molecular Mobility of Poly(ε-caprolactone) upon Drawing, Studied by Dielectric Relaxation Spectroscopy[J]. Chinese Journal of Polymer Science, 2018, 36(5): 665-674. DOI: 10.1007/s10118-018-2030-1. DOI：

摘要

Abstract

Dielectric relaxation spectroscopy (DRS) of poly(

-caprolactone) with different draw ratios showed that the mobility of polymer chains in the amorphous part decreases as the draw ratio increases. The activation energy of the

process

which corresponds to the dynamic glass transition

increases upon drawing. The enlarged gap between the activation energies of the

process and the

process results in a change of continuity at the crossover between the high temperature

process and the

and

processes. At low drawing ratios the

process connects with the

process

while at the highest drawing ratio in our measurements

the

process is continuous with the

process. This is consistent with X-ray diffraction results that indicate that upon drawing the polymer chains in the amorphous part align and densify upon drawing. As the draw ratio increases

the

relaxation broadens and decreases its intensity

indicating an increasing heterogeneity. We observed slope changes in the

traces

when the temperature decreases below that at which

≈ 1 s. This may indicate the glass transition from the 'rubbery' state to the non-equilibrium glassy state.

关键词

Keywords

references

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Changes of the Molecular Mobility of Poly(ε-caprolactone) upon Drawing, Studied by Dielectric Relaxation Spectroscopy

DOI：10.1007/s10118-018-2030-1

摘要

Abstract

关键词

Keywords

references