Oscillatory reactions in polymer systems

Abstract

Modified Belousov–Zhabotinskii (BZ) oscillation reactions were studied in the systems of ferroin or tris(2,2′‐bipyridyl)ruthenium(II) dichloride or the polymerized ruthenium complex as electron transfer agents and sulfuric acid or polyethylenesulfonic acid (HPES) as acidic media. HPES was a good acidic medium for the chemical oscillation in spite of a long induction period. Moreover, chemical oscillation was observed at low concentration of HPES, where no oscillation was observed in the solution of sulfuric acid. On the other hand, no oscillation was observed in the solution of polystyrenesulfonic acid (HPSS). These results were discussed from the standpoint of the nature of polyelectrolytes.

Design of Autonomous Gel Actuators

“…In these systems, the structure of the polymer does not change by the BZ reaction because the interaction between the gel structure and the reaction diffusion system is negligibly small. It was reported that polymers and gels undergo a slight spontaneous structure change [21][22][23]. In the oscillating gel systems, the polymer network itself takes part in the BZ reaction, because the metal catalyst is covalently bounded to the polymer chain.…”

Effect of polymer concentration on the lifetime and transmittance behavior of a self-oscillating polymer chain with a high lower critical solution temperature

“…In this study, we synthesized a self-oscillating polymer chain, covalently bonded to the transition-metal catalyst moiety [Ru(bpy)3], to undergo a periodical transmittance change induced by the BZ reaction [9][10][11][12][13][14][15][16][17][18][19][20][21]. In this latter reaction, a periodical change in the solubility of the polymer chain was synchronized with the periodical redox change in the Ru(bpy)3 moiety.…”

Effect of strong acid on the self-oscillating behavior for the polymer chain with the Fe(bpy)

“…In previous studies, self-oscillating polymer systems with a Ru catalyst moiety (Ru(bpy) 3 ) such as the Belouzov−Zhabotinsky (BZ) reaction [1][2][3][4][5][6] were developed [7][8][9][10][11][12][13][14]. The polymer chain with Ru(bpy) 3 undergoes a soluble-insoluble self-oscillation induced by the BZ reaction under constant temperature conditions.…”