Properties of Self-Doped PABA

3 PROPERTIES OF SELF-DOPED PABA 3.3.1 pH Dependent Redox Behavior 

The redox behavior of chemically and electrochemically prepared PABA in acidic solution (0.5 M HCl) is reportedly similar to that observed for unsubstituted polyaniline [41]. Two sets of redox waves are observed, at 0.18 and 0.74 V, suggesting facile conversion of leucoemeraldine to emeraldine and subsequent conversion to pernigraniline oxidation states. These results suggest that the boronic acid substituent and polymerization conditions have no detrimental influence on the electronic properties of the polymer. This is in contrast to sulfonated polyaniline where the redox couples are more closely spaced than for polyaniline due to the electronic and steric effects of the -SOa groups on the backbone of the polymer (for details see, Chapter 2, section 2.5.3). 

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