Abstract
The polymer chain with Fe(phen)3-catalyzed was demonstrated to occur self-oscillation phenomenon in BZ reaction system. The self-oscillation polymer composed of N-isopropylacrylamide and Fe(phen)3 catalyst moiety, which were synthesized by radical polymerization. It was found that the self-oscillation parameters (induction period, Ti, oscillation period, Tp and amplitude) could be regulated by subtle changes of temperature. It can be well explained by the FKN mechanism.
Highlights
Conventional stimuli-responsive hydrogels, which change their properties in response to external stimulus, such as temperature, pH, electric field and magnetic field, have been studied extensively for applications in drug delivery systems, biosensors, and actuators, etc (Tanaka et al, 1980; Annaka & Tanaka, 1992; Chen & Hoffman, 1995; Hirokawa & Tanaka, 1984; Bae, Okano, & Kim, 1990; Yoshida et al, 1995)
The mechanical oscillation is achieved by coupling nonlinear chemical dynamics with polymers, transferring the dissipating chemical energy of a self-oscillating reaction to the driving force for the conformation changing of the polymers
To achieve the applications of self-oscillating polymers, we developed a novel self-oscillating polymer by covalently bonding a Fe(phen)3 moiety, which acted as the metal catalyst for the BZ reaction
Summary
Conventional stimuli-responsive hydrogels, which change their properties in response to external stimulus, such as temperature, pH, electric field and magnetic field, have been studied extensively for applications in drug delivery systems, biosensors, and actuators, etc (Tanaka et al, 1980; Annaka & Tanaka, 1992; Chen & Hoffman, 1995; Hirokawa & Tanaka, 1984; Bae, Okano, & Kim, 1990; Yoshida et al, 1995). The self-oscillating microgels may be useful as artificial oscillators, and as rheological modifiers, and so on This kind of self-oscillating polymer system is too expensive for application in many fields owing to the use of expensive rare metal Ru as the catalyst moiety required for BZ reaction. Hara developed a novel self-oscillating polymer by covalently bonding the Fe(bpy) moiety to the polymer chain, which acted as the metal catalyst for the BZ reaction. To achieve the applications of self-oscillating polymers, we developed a novel self-oscillating polymer by covalently bonding a Fe(phen) moiety, which acted as the metal catalyst for the BZ reaction. In order to clarify the effect of temperature on the polymer chains oscillation, and to understand how self-oscillation of polymer can be controlled, the influence of temperature on the self-oscillation of the polymer chain was investigated in the present study
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