2016
DOI: 10.1039/c6ta01905f
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Alkali-stable and highly anion conducting poly(phenylene oxide)s carrying quaternary piperidinium cations

Abstract: New durable and hydroxide ion conducting anion--exchange membranes (AEMs) are currently required in order to develop alkaline fuel cells into efficient and clean energy conversion devices. In the present work we have attached quaternary piperidinium (QPi) groups to poly(2,6--dimethyl--1,4--phenylene oxide)s (PPOs) via flexible alkyl spacer chains with the aim to prepare AEMs. The bromine atoms of bromoalkylated PPOs were displaced in Menshutkin reactions to attach one or two QPi groups, respectively, via hepty… Show more

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Cited by 139 publications
(66 citation statements)
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“…We believed that this early degradation step was due to the decomposition of the sulfonium and ammonium iodide species, where the ≈20 wt% loss correlates closely to the amount of the iodine content from EDS analysis. This decomposition phenomenon has also been reported in previous studies and was also explained by the loss of the quaternization groups . What's interesting to see is the alteration of the thermal behavior after LB treatment.…”
Section: Resultssupporting
confidence: 85%
“…We believed that this early degradation step was due to the decomposition of the sulfonium and ammonium iodide species, where the ≈20 wt% loss correlates closely to the amount of the iodine content from EDS analysis. This decomposition phenomenon has also been reported in previous studies and was also explained by the loss of the quaternization groups . What's interesting to see is the alteration of the thermal behavior after LB treatment.…”
Section: Resultssupporting
confidence: 85%
“…The stability was also strongly inuenced by the size of the N-spirocyclic QA cation. With a given precursor copolymer, the AEMs with Py rings consistently had a signi-cantly higher T d,95 (by [16][17][18][19][20][21][22][23][24][25] C) than those with Pi2 rings.…”
Section: Hydroxide Conductivitymentioning
confidence: 96%
“…For example, N,N-dimethylpiperidinium and 6-azonia-spiro [5.5]undecane-6-ium cations show approximately 21 and 26 times longer halimes, respectively, than the conventional benzyltrimethyl QA cation in 6 M NaOH at 160 C. 15 The high stability of the former cations has been ascribed to low ring strain and to constrained conformations imposed by the ring structure, which increase the transition state energy of both substitution and elimination reactions. 15 These results have inspired the preparation and study of a range of different AEMs functionalised with piperidinium [25][26][27][28][29] and spirocyclic QA cations. 13,[30][31][32][33][34][35] For example, we recently prepared poly (arylene N,N-dimethylpiperidinium)s by polycondensation of N-methyl-4-piperidone and electron-rich phenyl monomers via superelectrophilic activation in triic acid, followed by quaternisation reactions with iodomethane.…”
Section: -21mentioning
confidence: 99%
“…3 Within different types of fuel cells, proton exchange membrane fuel cell (PEMFC) has been developed in a fastest way in the past few decades. 8 Under such background, a new type of fuel cell, namely the alkaline anion exchange membrane fuel cell (AEMFC) has been gradually getting people's attention and being researched during the last few decades. However, these superiorities are limited by the strict temperature requirements.…”
Section: Introductionmentioning
confidence: 99%