Acta Phys. -Chim. Sin. ›› 1995, Vol. 11 ›› Issue (08): 741-745.doi: 10.3866/PKU.WHXB19950815

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The Effects of Polyethylene Glycol on Oscillating Reactions

He Zhan-Bo,Huang Zhi,Gu Ti-Ren   

  1. Department of Chemistry,Tianjin University,Tianjin 300072|Department of Chemistry,Peking University,Beijing 100871
  • Received:1994-08-23 Revised:1994-10-21 Published:1995-08-15
  • Contact: He Zhan-Bo


It was found from experiments that the addition of polythylene glycol (PEG) can make the B-Z and B-R reactions producing double induction periods, i.e. before the general induction period there is an earlier stage of induction in which there is no any change of color and state. The lifetime of the earlier stage is not only effected by the concentration of PEG, but also by the time of the last reagent added. It was also found that there are two linear relationships between the concentration of PEG and the reduced viscodity of PEG solution or /and the lifetime of the earlier stage of induction. Another characteristic of PEG effect is that it can decrease the period change during the oscillating reactions. These experimental results are not only useful in the research of chemical oscillation, but also give a simple method for determining colligative properties of macromolecule sultion.

Key words: Polyethylene glycol, Oscillating reacion, Double induction periods