Investigating the role of polymer size on ionic conductivity in free-standing hyperbranched polyelectrolyte membranes

POLYMER

卷:223

Article

Abrahamsson, Tobias¹  Vagin, Mikhail¹  Seitanidou, Maria¹  Roy, Arghyamalya¹  Phopase, Jaywant¹  Petsagkourakis, Ioannis¹  Moro, Nathalie^1,2  Tybrandt, Klas¹  Crispin, Xavier¹  Berggren, Magnus¹  Simon, Daniel T.¹ 

[1] Linkoping Univ, Dept Sci & Technol, Lab Organ Elect, S-60174 Norrkoping, Sweden

[2] Empa, Lab Biointerfaces, Swiss Fed Labs Mat Sci & Technol, CH-9014 St Gallen, Switzerland

关键词: Ion-exchange membrane;    Polymer size dependant ionic conductivity;    Hyperbranched polyelectrolyte;    Multi-functionalization;    Click cross-linking;   

DOI  :  10.1016/j.polymer.2021.123664

来源: Elsevier

【 摘 要 】

Polymer-based ion exchange membranes (IEMs) are utilized for many applications such as in water desalination, energy storage, fuel cells and in electrophoretic drug delivery devices, exemplified by the organic electronic ion pump (OEIP). The bulk of current research is primarily focused on finding highly conductive and stable IEM materials. Even though great progress has been made, a lack of fundamental understanding of how specific polymer properties affect ionic transport capabilities still remains. This leads to uncertainty in how to proceed with synthetic approaches for designing better IEM materials. In this study, an investigation of the structure-property relationship between polymer size and ionic conductivity was performed by comparing a series of membranes, based on ionically charged hyperbranched polyglycerol of different polymer sizes. Observing an increase in ionic conductivity associated with increasing polymer size and greater electrolyte exclusion, indi-cating an ionic transportation phenomenon not exclusively based on membrane electrolyte uptake. These findings further our understanding of ion transport phenomena in semi-permeable membranes and indicate a strong starting point for future design and synthesis of IEM polymers to achieve broader capabilities for a variety of ion transport-based applications.

【 授权许可】

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