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Oxidative polymerization of phenylenediamines by enzyme and magnetic properties of the products
Author(s) -
Ichinohe Daigo,
Muranaka Toshitaka,
Kise Hideo
Publication year - 1998
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/(sici)1097-4628(19981024)70:4<717::aid-app11>3.0.co;2-u
Subject(s) - magnetization , polymerization , polymer , materials science , coercivity , ferromagnetism , aqueous solution , magnet , squid , chemical engineering , polymer chemistry , chemistry , composite material , organic chemistry , magnetic field , condensed matter physics , ecology , physics , quantum mechanics , engineering , biology
Oxidative polymerization of m ‐phenylenediamine was carried out using H 2 O 2 as an oxidant and horseradish peroxidase as a catalyst in mixtures of aqueous buffer solution and 1,4‐dioxane or in reversed micellar solutions. When the reaction mixture was brought into contact with a stainless steel stick, the obtained polymer responded to a permanent magnet at room temperature in the air. From the ICP emission spectroscopic analysis, it was found that these polymers contained small amounts of transition metals, such as Fe and Ni. The magnetic properties of the obtained polymers were studied with a superconducting quantum interference device (SQUID). The M (magnetization)– H (magnetic field) curves showed sigmoid behavior at 300 K, but did not exhibit a residual magnetization and a coercive force. These properties resembled those of soft ferromagnetic materials. The ferromagnetic behavior was indicated even at 800 K. Polymers of o ‐ and p ‐phenylenediamines exhibited lower values of saturation magnetization than polymers of m ‐phenylenediamine. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 70: 717–721, 1998