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Protonation of polyaniline by surface‐functionalized polymer substrates
Author(s) -
Pun M. Y.,
Neoh K. G.,
Kang E. T.,
Loh F. C.,
Tan K. L.
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070560306
Subject(s) - sulfonic acid , surface modification , polymer chemistry , materials science , protonation , low density polyethylene , high density polyethylene , polymer , fourier transform infrared spectroscopy , polyethylene , polyaniline , copolymer , acrylic acid , polypropylene , x ray photoelectron spectroscopy , chemical engineering , chemistry , organic chemistry , composite material , polymerization , ion , engineering
The protonation of solution‐coated emeraldine (EM) base by sulfonic and carboxylic acid groups on surface‐functionalized low‐density polyethylene (LDPE), high‐density polyethylene (HDPE), polypropylene (PP), poly(ethylene terephthalate) (PET), and polytetrafluoroethylene (PTFE) films were characterized by X‐ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy, and conductivity measurements. Surface functionalizations were achieved by sulfonation (for LDPE, HDPE, PP, and PET), by hydrolysis (for PET), and by near‐UV‐light‐induced surface graft copolymerization with the Na salt of styrene sulfonic acid and acrylic acid (for all substrates). The efficiency of surface functionalization by graft copolymerization is substantially enhanced for substrates pretreated with O 3 or Ar plasma. Protonation levels of 50% can be readily achieved for EM coated on sulfonic acid, but not carboxylic acid, functionalized surfaces. The extent of protonation, however, is also dependent on the microstructures of the modified substrate surfaces. In all cases, charge transfer interactions between the EM layer and the functionalized substrates readily result in good adhesion of the electroactive polymer on the polymer substrates to give rise to conductive surface structures. © 1995 John Wiley & Sons, Inc.