Solvent diffusion in a modified polyaniline

✍ Scribed by W. P. Hsu; K. S. Ho

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 193 KB
• Volume: 66
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19971219)66:11<2095::aid-app5>3.0.co;2-c

✦ Synopsis

A dodedyl benzene sulfonic acid doped polyaniline was synthesized and cast into films. Water and ethanol were used as the main diffusional probes to study this polymer from 25ЊC to 45ЊC. Sorption of water in this polymer was found to be almost independent of temperature, but sorption of ethanol in the same polymer decreased mostly with increasing temperature. Water diffusion was non-Fickian, but ethanol diffusion was Fickian. Probably some rearrangement of polymer structure happened at temperatures between 40ЊC and 45ЊC as detected by two-stage sorption of water at 40ЊC and an abrupt increase in ethanol diffusivity from 40ЊC to 45ЊC. 1-Propanol diffusion at 32.5ЊC was also performed and also found to be Fickian, but the rate of diffusion was slower than that of ethanol. The sorbed amount of solvent in this polymer had the order (1-propanol ú ethanol ú water) owing to the most hydrophobic structure of this polymer.