Ion clustering in styrene-based ionomers: Calorimetric and gravimetric hydration studies and effect of ion concentration and thermal history

✍ Scribed by M. Escoubes; M. Pineri; S. Gauthier; A. Eisenberg

• Publisher: John Wiley and Sons
• Year: 1984
• Tongue: English
• Weight: 970 KB
• Volume: 29
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1984.070290420

✦ Synopsis

The water sorption behavior of styrene-methacrylic acid copolymers and of their sodium salts has been studied as a function of concentration of ionic groups and nature of the sample. The influence of thermal history has also been examined. The salt forms of the copolymers were found to have a greater hydration capacity than the acids, the hydration capacity increasing with ion content for the salts. The hydration energy of the acid forms was found to be in the vicinity of the liquefaction energy of water whereas the energy for the salt forms became much lower than that value, with increasing water content. This decrease in energy has been attributed to a rearrangement of the chster structure to accommodate more water molecules.