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Water‐Soluble Polyaniline from γ ‐Ray‐Induced N ‐Acylation Graft Copolymerization with Acrylic Acid in the Emeraldine State
Author(s) -
Chen Yongjun,
Kang E. T.,
Neoh K. G.,
Ma Z. H.,
Tan K. L.
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20010301)202:6<785::aid-macp785>3.0.co;2-c
Subject(s) - copolymer , polymer chemistry , polyaniline , monomer , fourier transform infrared spectroscopy , aqueous solution , solvent , acrylic acid , materials science , acylation , chemistry , thermogravimetric analysis , x ray photoelectron spectroscopy , polymer , chemical engineering , organic chemistry , polymerization , catalysis , engineering
Abstract The effect of γ ‐ray irradiation on the emeraldine (EM) base form of polyaniline was investigated. The processes of γ ‐ray, UV, and thermally‐induced graft copolymerization of EM base with acrylic acid (AAc) in a number of solvents and co‐solvents were compared in an attempt to prepare a water‐soluble EM through N ‐acylation. The presence of N ‐acylation was investigated by thermogravimetric (TG) analysis, Fourier transform infrared (FTIR) spectroscopy, and X‐ray photoelectron spectroscopy (XPS). In all cases, the graft concentration and the resulting surface conductivity were shown to be a function of the monomer concentration. The thermostability and weight loss behavior of the graft‐copolymerized EM included those that were characteristic of the EM base, the AAc polymer and the amide polymer. Some of the graft‐modified EM base samples exhibited good water solubility. In particular, the γ ‐ray‐induced graft copolymerization of EM with AAc in N ‐methyl‐2‐pyrrolidinone(NMP)/water co‐solvent readily gave rise to a water‐soluble, self‐protonated and semi‐conductive EM, which could be cast into free‐standing films from an aqueous solution.