Can I read Synthesis and Characterization of Sulfonated Polyimides Containing Trifluoromethyl Groups as Proton Exchange Membranes on EtoBox?

Synthesis and Characterization of Sulfonated Polyimides Containing Trifluoromethyl Groups as Proton Exchange Membranes by Qingshuang Zhang; Qiaoling Li is a Chemistry article available to read on EtoBox.

What is Synthesis and Characterization of Sulfonated Polyimides Containing Trifluoromethyl Groups as Proton Exchange Membranes about?

A novel sulfonated diamine, 4,4'-bis(4-amino-3-trifluoromethylphenoxy) biphenyl 3,3'-disulfonic acid (F-BAPBDS), was successfully synthesized by nucleophilic aromatic substitution of 4,4'-dihydroxybiphenyl with 2-chloro-5-nitrobenzotrifluoride, followed by reduction and sulfonation. A series of sulfonated polyimides of high molecular weight (SPI-x, x represents the molar percentage of the sulfonated monomer) were prepared by copolymerization of 1,4,5,8-naphathlenetetracarboxylic dianhydride (NTDA) with F-BAPBDS and nonsulfonated diamine. Flexible and tough membranes of high mechanical strength were obtained by solution casting and the electrolyte properties of the polymers were intensively investigated. The copolymer membranes exhibited excellent oxidative stability due to the introducing of the CF 3 groups. The SPI membranes displayed desirable proton conductivity (0.52×10 -1 -0.97×10 -1 S•cm -1 ) and low methanol permeability (less than 2.8×10 -7 cm 2 •s -1 ). The highest proton conductivity (1.89×10 -1 S•cm -1 ) was obtained for the SPI-90 membrane at 80 °C, with an IEC of 2.12 mequiv/g. This value is higher than that of Nafion 117 (1.7×10 -1 S•cm -1 ). Furthermore, the hydrolyt

Who reads Synthesis and Characterization of Sulfonated Polyimides Containing Trifluoromethyl Groups as Proton Exchange Membranes?

Author

Qingshuang Zhang; Qiaoling Li

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley-Blackwell; Science Press; Wiley (ISSN 0256-7660)

Published

2011

Language

EN

Field

Chemistry (Physical Sciences)