Simple-liquid dynamics emerging in the mechanical shear spectra of poly(propylene glycol)

Catalin Gainaru; Tina Hecksher; Fei Fan; Kunyue Xing; Burak Cetinkaya; Niels Boye Olsen; Jeppe C. Dyre; Alexei P. Sokolov; Roland Böhmer

doi:10.1007/s00396-017-4206-6

Simple-liquid dynamics emerging in the mechanical shear spectra of poly(propylene glycol)

Catalin Gainaru, Tina Hecksher, Fei Fan, Kunyue Xing, Burak Cetinkaya, Niels Boye Olsen, Jeppe C. Dyre, Alexei P. Sokolov, Roland Böhmer

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

The present dielectric investigations of methyl-terminated poly(propylene glycol) (PPG) oligomers reveal that near the glass transition the normal modes and segmental relaxation merge in a single-process susceptibility spectrum, similar to previous observations on OH-terminated species. Moreover, the present shear-mechanical measurements demonstrate that the vanishing of chain modes can be monitored without recourse to dielectric investigations, which are able to access chain dynamics only for the relatively small fraction of type A polymers. As the normal and segmental modes merge, the viscosity displays a crossover from a polymer-like regime governed by the chain dynamics, to a simple-liquid regime governed by the structural relaxation.

Original language	English
Pages (from-to)	2433-2437
Number of pages	5
Journal	Colloid and Polymer Science
Volume	295
Issue number	12
DOIs	https://doi.org/10.1007/s00396-017-4206-6
State	Published - Dec 1 2017
Externally published	Yes

Funding

Acknowledgements Support by the Deutsche Forschungsgemeinschaft (Grant BO1301/14-1) is gratefully acknowledged. This work was partially supported by the VILLUM Foundation. The US team thanks the NSF Polymer program for financial support (DMR-1408811).

Funders	Funder number
National Science Foundation	DMR-1408811
Villum Fonden
Deutsche Forschungsgemeinschaft	BO1301/14-1

Keywords

Dielectric spectroscopy
Hydrogen bonding
Normal modes
Rheology

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10.1007/s00396-017-4206-6

Cite this

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abstract = "The present dielectric investigations of methyl-terminated poly(propylene glycol) (PPG) oligomers reveal that near the glass transition the normal modes and segmental relaxation merge in a single-process susceptibility spectrum, similar to previous observations on OH-terminated species. Moreover, the present shear-mechanical measurements demonstrate that the vanishing of chain modes can be monitored without recourse to dielectric investigations, which are able to access chain dynamics only for the relatively small fraction of type A polymers. As the normal and segmental modes merge, the viscosity displays a crossover from a polymer-like regime governed by the chain dynamics, to a simple-liquid regime governed by the structural relaxation.",

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AU - Gainaru, Catalin

AU - Hecksher, Tina

AU - Fan, Fei

AU - Xing, Kunyue

AU - Cetinkaya, Burak

AU - Olsen, Niels Boye

AU - Dyre, Jeppe C.

AU - Sokolov, Alexei P.

AU - Böhmer, Roland

PY - 2017/12/1

Y1 - 2017/12/1

N2 - The present dielectric investigations of methyl-terminated poly(propylene glycol) (PPG) oligomers reveal that near the glass transition the normal modes and segmental relaxation merge in a single-process susceptibility spectrum, similar to previous observations on OH-terminated species. Moreover, the present shear-mechanical measurements demonstrate that the vanishing of chain modes can be monitored without recourse to dielectric investigations, which are able to access chain dynamics only for the relatively small fraction of type A polymers. As the normal and segmental modes merge, the viscosity displays a crossover from a polymer-like regime governed by the chain dynamics, to a simple-liquid regime governed by the structural relaxation.

AB - The present dielectric investigations of methyl-terminated poly(propylene glycol) (PPG) oligomers reveal that near the glass transition the normal modes and segmental relaxation merge in a single-process susceptibility spectrum, similar to previous observations on OH-terminated species. Moreover, the present shear-mechanical measurements demonstrate that the vanishing of chain modes can be monitored without recourse to dielectric investigations, which are able to access chain dynamics only for the relatively small fraction of type A polymers. As the normal and segmental modes merge, the viscosity displays a crossover from a polymer-like regime governed by the chain dynamics, to a simple-liquid regime governed by the structural relaxation.

KW - Dielectric spectroscopy

KW - Hydrogen bonding

KW - Normal modes

KW - Rheology

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ER -

Simple-liquid dynamics emerging in the mechanical shear spectra of poly(propylene glycol)

Abstract

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Keywords

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