Citation: Xiao-Yan Yang, Shao-Shuai Liu, Alexander V. Korobko, Stephen J. Picken, Nicolaas A. M. Besseling. 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 shu

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

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

Corresponding author: Xiao-Yan Yang, hsiaoyen_yang@hotmail.com
Received Date: 19 July 2017
Accepted Date: 30 August 2017
Available Online: 15 January 2018

Dielectric relaxation spectroscopy (DRS) of poly(ε-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 α process, which corresponds to the dynamic glass transition, increases upon drawing. The enlarged gap between the activation energies of the α process and the β process results in a change of continuity at the crossover between the high temperature a process and the α and β processes. At low drawing ratios the a process connects with the β process, while at the highest drawing ratio in our measurements, the a process is continuous with the α 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 α relaxation broadens and decreases its intensity, indicating an increasing heterogeneity. We observed slope changes in the α traces, when the temperature decreases below that at which τ_α ≈ 1 s. This may indicate the glass transition from the 'rubbery' state to the non-equilibrium glassy state.
- Semicrystalline polymer,
- Dielectric relaxation spectroscopy,
- Molecular mobility
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