Structure-property correlation of semifluorinated 6-membered co-SPIs for proton exchange membrane

Mistri EA, Banerjee S, Komber H, Voit B (2015)

Publication Type: Journal article

Publication year: 2015

Journal

European Polymer Journal Elsevier

Book Volume: 73

Pages Range: 466-479

DOI: 10.1016/j.eurpolymj.2015.11.006

Abstract

This article reports the synthesis, characterization and proton exchange membrane (PEM) properties of four new structurally different naphthalenetetracarboxylic dianhydride (NTDA)-based semifluorinated sulfonated copolyimides (co-SPIs) containing heterocyclic groups as well as phenyl ring with various catenation angles. To understand the structure-property correlation, the co-SPIs were prepared with a fixed sulfonation degree (70%, IEC ∼ 2.1) by using the fixed molar feed ratio of sulfonated diamine to the different non-sulfonated diamines. The structures of the different co-SPIs, namely, p-DTN70, m-DTN70, DPyN70, and DThN70 were confirmed by FTIR and NMR spectroscopy. All the co-SPIs showed high thermal stability for 5% weight loss temperature (290-300°C) in synthetic air. Transparent, flexible and membranes were prepared from the co-SPIs that showed tensile strength in the range of 50-65 MPa and Young's modulus values in the range of 1.6-1.84 GPa in wet condition. It was noticed that the dimensional and oxidative stability were higher for para-connecting co-SPI membrane (p-DTN70) than for meta-connecting membranes (m-DTN70, DPyN70 and DThN70). Whereas, the proton conductivity was found highest for meta-connecting m-DTN70 membrane (σ = 79.2 mS/cm at 90°C) due to the higher water uptake and better phase separated morphology of the membrane as observed by transmission electron microscopy analysis.

Involved external institutions

Indian Institute of Technology Bombay IN India (IN) Leibniz-Institut für Polymerforschung Dresden e. V. DE Germany (DE)

How to cite

APA:

Mistri, E.A., Banerjee, S., Komber, H., & Voit, B. (2015). Structure-property correlation of semifluorinated 6-membered co-SPIs for proton exchange membrane. European Polymer Journal, 73, 466-479. https://doi.org/10.1016/j.eurpolymj.2015.11.006

MLA:

Mistri, Ershad Ali, et al. "Structure-property correlation of semifluorinated 6-membered co-SPIs for proton exchange membrane." European Polymer Journal 73 (2015): 466-479.

BibTeX: Download