Ionic transport, microphase separation, and polymer relaxation in poly(propylene glycol) and lithium perchlorate mixtures

Fei Fan; Yangyang Wang; Alexei P. Sokolov

doi:10.1021/ma401238k

Ionic transport, microphase separation, and polymer relaxation in poly(propylene glycol) and lithium perchlorate mixtures

Fei Fan, Yangyang Wang, Alexei P. Sokolov

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Abstract

By combining broadband dielectric spectroscopy (BDS) and differential scanning calorimetry (DSC), the ionic transport, microphase separation, and polymer relaxation in poly(propylene glycol) (PPG) and lithium perchlorate (LiClO₄) mixtures have been systematically examined as a function of temperature, pressure, polymer molecular weight, and salt concentration. While the low molecular weight PPG-LiClO₄ mixtures exhibit only a single phase, microphase separation is observed in the mixtures of higher molecular weight PPGs (1000 and 4000 g/mol). In the samples with microphase separation, BDS and DSC yield consistent glass transition temperatures for ion-rich and ion-depleted domains. Our Walden plot analysis indicates that the ionic transport in PPG-LiClO₄ is controlled by the (slow) segmental relaxation, and the data of all PPG-LiClO₄ fall close to the "ideal" Walden line. Last, the application of pressure not only suppresses the microphase separation, but also decouples the ionic transport from the segmental relaxation.

Original language	English
Pages (from-to)	9380-9389
Number of pages	10
Journal	Macromolecules
Volume	46
Issue number	23
DOIs	https://doi.org/10.1021/ma401238k
State	Published - Dec 10 2013

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title = "Ionic transport, microphase separation, and polymer relaxation in poly(propylene glycol) and lithium perchlorate mixtures",

abstract = "By combining broadband dielectric spectroscopy (BDS) and differential scanning calorimetry (DSC), the ionic transport, microphase separation, and polymer relaxation in poly(propylene glycol) (PPG) and lithium perchlorate (LiClO4) mixtures have been systematically examined as a function of temperature, pressure, polymer molecular weight, and salt concentration. While the low molecular weight PPG-LiClO4 mixtures exhibit only a single phase, microphase separation is observed in the mixtures of higher molecular weight PPGs (1000 and 4000 g/mol). In the samples with microphase separation, BDS and DSC yield consistent glass transition temperatures for ion-rich and ion-depleted domains. Our Walden plot analysis indicates that the ionic transport in PPG-LiClO4 is controlled by the (slow) segmental relaxation, and the data of all PPG-LiClO4 fall close to the {"}ideal{"} Walden line. Last, the application of pressure not only suppresses the microphase separation, but also decouples the ionic transport from the segmental relaxation.",

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T1 - Ionic transport, microphase separation, and polymer relaxation in poly(propylene glycol) and lithium perchlorate mixtures

AU - Fan, Fei

AU - Wang, Yangyang

AU - Sokolov, Alexei P.

PY - 2013/12/10

Y1 - 2013/12/10

N2 - By combining broadband dielectric spectroscopy (BDS) and differential scanning calorimetry (DSC), the ionic transport, microphase separation, and polymer relaxation in poly(propylene glycol) (PPG) and lithium perchlorate (LiClO4) mixtures have been systematically examined as a function of temperature, pressure, polymer molecular weight, and salt concentration. While the low molecular weight PPG-LiClO4 mixtures exhibit only a single phase, microphase separation is observed in the mixtures of higher molecular weight PPGs (1000 and 4000 g/mol). In the samples with microphase separation, BDS and DSC yield consistent glass transition temperatures for ion-rich and ion-depleted domains. Our Walden plot analysis indicates that the ionic transport in PPG-LiClO4 is controlled by the (slow) segmental relaxation, and the data of all PPG-LiClO4 fall close to the "ideal" Walden line. Last, the application of pressure not only suppresses the microphase separation, but also decouples the ionic transport from the segmental relaxation.

AB - By combining broadband dielectric spectroscopy (BDS) and differential scanning calorimetry (DSC), the ionic transport, microphase separation, and polymer relaxation in poly(propylene glycol) (PPG) and lithium perchlorate (LiClO4) mixtures have been systematically examined as a function of temperature, pressure, polymer molecular weight, and salt concentration. While the low molecular weight PPG-LiClO4 mixtures exhibit only a single phase, microphase separation is observed in the mixtures of higher molecular weight PPGs (1000 and 4000 g/mol). In the samples with microphase separation, BDS and DSC yield consistent glass transition temperatures for ion-rich and ion-depleted domains. Our Walden plot analysis indicates that the ionic transport in PPG-LiClO4 is controlled by the (slow) segmental relaxation, and the data of all PPG-LiClO4 fall close to the "ideal" Walden line. Last, the application of pressure not only suppresses the microphase separation, but also decouples the ionic transport from the segmental relaxation.

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JO - Macromolecules

JF - Macromolecules

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ER -

Ionic transport, microphase separation, and polymer relaxation in poly(propylene glycol) and lithium perchlorate mixtures

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