Hydroxide excellent chemical stability

For high-performance HEMFC applications, HEMs and HEIs are required to have high hydroxide conductivity, excellent chemical stability, sufficient physical stability, controlled solubility, and other important properties. 

The excellent chemical stability of perfluorinated alkanoic and alkanesul-fonic acids to acids, oxidants, and alkali [5,13,17] allows their application under conditions too severe for hydrocarbon-based surfactants. Gramstad and Haszel-dine [14] did not detect fluoride when they heated potassium perfluorooctanesulfonate (0.9 g) in water (5 mL) at 300°C for 8 h. However, when potassium perfluorooctanesulfonate was heated in 10% aqueous potassium hydroxide for 8 h at 270°C, 8% of the theoretical amount of fluoride was liberated. Perfluorooctane-... 

The chemical resistance of polyester amide glass fibre composite is excellent [126]. A solvent mixture of CF3COOH/CHCI3 was used as a solvent for thermotropic LC polyester, based on 4-chlorocarbonyl phenyl esters of aromatic dicarboxylic acids and phenols or aliphatic diols for viscosity measurement. This indicates thermal stability in various organic solvents. [127]. Unsaturated aromatic LC polyesters, synthesized with the aim to fix the LC state, can be crosslinked by using styrene. The crosslinked matrix can be degraded by refluxing in 3 M aqueous sodium hydroxide solution and methanol in a vol. ratio of 3 2 [128]. 

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