Studies of influence of naphthalene mono/disulfonic acid dopant on thermal stability of polypyrrole

✍ Scribed by Jing Liu; Xiaocong Wang; Xiangzheng Hu; Anqinq Xiao; Meixiang Wan

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 114 KB
• Volume: 109
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.28051

✦ Synopsis

Abstract

Thermal stability of polypyrrole (PPY) synthesized by in situ doping polymerization in the presence of different naphthalene mono/disulfonic acid dopant like α‐naphthalene sulfonic acid (α‐NSA), β‐naphthalene sulfonic acid (β‐NSA), and 1,5‐naphthalene disulfonic acid (1,5‐NDSA) has been systematically investigated by thermogravimetric analysis (TG). It was found that the thermal stability of as‐resulted PPY was greatly affected by type and concentration of dopant. In general, the order of their thermal stability was PPY‐(β‐NSA) > PPY‐(α‐NSA) ≈ PPY‐(1,5‐NDSA). And high concentration of dopant (e.g., 1.2 mol/L) had a negative effect on the thermal stability. Among those three dopants, 1,5‐NDSA had a unique influence on thermal stability and crystallinity of as‐resulted PPY. In addition, all of room‐temperature conductivity and crystallinity of PPY‐(1,5‐NDSA) changed dramatically after aging for 9 h under N~2~ atmosphere and at 230°C, which may be due to a partly dedoping process. These results were confirmed by elemental analysis, FTIR, X‐ray photoelectron spectroscopy (XPS), and X‐ray powder diffraction (XRD). © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008