32765-81-4Relevant articles and documents
Side-chain-type anion exchange membranes bearing pendant quaternary ammonium groups: Via flexible spacers for fuel cells
Lin, Chen Xiao,Huang, Xiao Ling,Guo, Dong,Zhang, Qiu Gen,Zhu, Ai Mei,Ye, Mei Ling,Liu, Qing Lin
, p. 13938 - 13948 (2016)
To realize high performance anion exchange membranes (AEMs) for alkaline fuel cells (AFCs), a series of quaternized poly(ether sulfone)s (PESs) with different lengths of flexible spacers linking cationic groups and the backbone was synthesized via nucleophilic polycondensation, demethylation and Williamson reactions. Atomic force microscopy (AFM) phase images show clear hydrophilic/hydrophobic phase separation for all the side-chain-type AEMs. The PES-n-QA membrane with hexyleneoxy spacers (n = 6) between the cationic groups and backbone (benzene ring) exhibited the maximum conductivity of 62.7 mS cm-1 (IEC = 1.48 meq. g-1) at 80 °C. The AEM materials are found to have an improved long-term alkaline stability by extending the length of the flexible spacer (n ≥ 4). The PES-12-QA membrane with a flexible dodeceneoxy spacer demonstrated the highest alkaline stability, where the conductivity and IEC only decreased by 8.1% and 6.9% after immersing in a 1 M aqueous KOH solution at 60 °C for 720 h. Furthermore, the single fuel cell performance test using PES-6-QA as an AEM showed a maximum power density of 108.3 mW cm-2 at a current density of 250 mA cm-2 at 60 °C.
Crosslinked Polymers
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, (2011/07/08)
Disclosed herein are pharmaceutical compositions comprising wet granulated bile acid sequestrants having the general Formula I shown, and their process of preparation. The present invention also discloses process for preparation of Colesevelam hydrochloride, an antilipemic agent.
Potent acetylcholinesterase inhibitors: Design, synthesis, and structure - Activity relationships of bis-interacting ligands in the galanthamine series
Mary, Aude,Renko, Dolor Zafiarisoa,Guillou, Catherine,Thal, Claude
, p. 1835 - 1850 (2007/10/03)
New galanthamine derivatives, especially bis-interacting ligands 3-5 and 7-9 were prepared in order to interact with the catalytic and the peripheral sites of acetylcholinesterase (AChE). The synthesis, the anticholinesterase activities, and the structure-activity relationships of bis-interacting ligands are reported. Compounds 4d-e were found to be more potent than galanthamine and tacrine in inhibiting AChE. Copyright (C) 1998 Elsevier Science Ltd.