Damping Behavior of the Aggregation–Disaggregation Self-Oscillation of a Polymer Chain

✍ Scribed by Yusuke Hara; Ryo Yoshida

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 438 KB
• Volume: 30
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.200900262

✦ Synopsis

Abstract

The effect of the initial concentration of the substrates of the Belousov–Zhabotinsky (BZ) reaction, and the temperature, on the autonomous aggregation–disaggreagtion self‐oscillation of a polymer chain is investigated. The polymer chain consists of N‐isopropylacrylamide (NIPAAm), a Ru catalyst of the BZ reaction, and acrylamide‐2‐methylpropanesulfonic acid (AMPS) as a pH and solubility control site. It is demonstrated that the initial concentration of the BZ substrates and the temperature exert an influence on the waveform and the period of the self‐oscillation. Moreover, the aggregation–disaggregation self‐oscillation of the polymer chain undergoes damping, that is, the amplitude of the transmittance self‐oscillation decreases with time. This phenomenon is attributed to an increase in the size of the polymer aggregates during the self‐oscillating behavior. Therefore, the damping behavior is significantly affected by the initial concentration of the BZ substrates in accordance with the Field–Körös–Noyes (FKN) mechanism. In addition, it is shown that the self‐oscillating region is determined by the initial concentrations of the BZ substrates and the temperature. This study clarifies that the self‐oscillation of the AMPS‐containing polymer chain can be controlled by the selection of the initial concentration of the BZ substrates and the temperature under acid‐free conditions.

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