Synthesis and ferromagnetic properties of composites of a water-soluble polyaniline copolymer containing iron oxide

✍ Scribed by Meixiang Wan; Junhua Fan

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 136 KB
• Volume: 36
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19981115)36:15<2749::aid-pola11>3.0.co;2-o

✦ Synopsis

Composites of water-soluble conducting polyaniline copolymers, poly(aniline-co-aminobenzenesulfonic acid) (PAOABSA), containing ␥-Fe 2 O 3 magnetic particles with nanometer size, were synthesized by a chemical method. The ferromagnetic properties of the resulting PAOABSA composites were measured as a function of the pH value of the reaction solution, the sulfonated degree of the copolymer, and the concentration of FeCl 2 . The structure of the composites was characterized by means of elemental analysis, FTIR, XPS, and X-ray diffraction. It was found that increasing the pH value of the reaction solution and the concentration of FeCl 2 is favorable for an enhancement of the saturated magnetization. As high as 33.2 emu/g of saturated magnetization for the PAOABSA composites was observed. No hysteresis loop (i.e. H c ϭ 0) was observed, which is independent of the preparation conditions. Structure characterizations show that iron oxide existing in the composite is mainly ␥-Fe 2 O 3 , which is responsible for the ferromagnetic properties of the PAOABSA composites, whereas ␥-Fe 2 O 3 magnetic particles nanometer in size (ϳ85 nm) may be attributed to a lower coercive force (i.e. H c ϭ 0) of the composites.