Journal
MACROMOLECULES
Volume 49, Issue 13, Pages 4714-4722Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.6b00653
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Funding
- Army Research Office through MURI award [W911NF-10-1-0520]
- NSF
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- Postgraduate Research Participation Program at the US Army Research Laboratory [ORISE 1120-1120-99]
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Triblock and diblock copolymers based on isoprene (Ip) and chloromethylstyrene (CMS) were synthesized by sequential polymerization using reversible addition-fragmentation chain transfer radical polymerization (RAFT). The block copolymers were quaternized with tris(2,4,6-trimethoxyphenyl)phosphine (Ar3P) to prepare soluble ionomers. The ionomers were cast from chloroform to form anion exchange membranes (AEMs) with highly ordered morphologies. At low volume fractions of ionic blocks, the ionomers formed lamellar morphologies, while at moderate volume fractions (>= 30% for triblock and >= 22% for diblock copolymers) hexagonal phases with an ionic matrix were observed. Ion conductivities were higher through the hexagonal phase matrix than in the lamellar phases. Promising chloride conductivities (20 mS/cm) were achieved at elevated temperatures and humidified conditions.
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