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Related Experiment Videos

Memory effect in the chain-collapse process in a dilute polymer solution.

Yasuyuki Maki1, Naoki Sasaki, Mitsuo Nakata

  • 1Department of Polymer Science, Fuculty of Science, Hokkaido University, Sapporo 060-0810, Japan.

The Journal of Chemical Physics
|December 21, 2004
PubMed
Summary

Polymer chain collapse remembers its history. Even after temperature changes, poly(methyl methacrylate) chains retain memory of their initial collapse, influencing subsequent collapse dynamics.

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Area of Science:

  • Polymer Science
  • Physical Chemistry
  • Materials Science

Background:

  • Understanding polymer chain dynamics is crucial for designing advanced materials.
  • The single-chain-collapse process is fundamental to polymer behavior in solution.
  • Temperature plays a significant role in altering polymer conformation.

Purpose of the Study:

  • To investigate the effect of temperature perturbation on the single-chain-collapse process of poly(methyl methacrylate) (PMMA).
  • To analyze the memory effect of chain collapse under varying temperature conditions.
  • To quantify the influence of positive and negative temperature perturbations on collapse dynamics.

Main Methods:

  • Studied poly(methyl methacrylate) with a molecular weight of 1.05 x 10^7.

Related Experiment Videos

  • Utilized a mixed solvent of tert-butyl alcohol and water (2.5 vol %).
  • Employed static light scattering to measure the mean-square radius of gyration.
  • Analyzed the chain-collapse process using the expansion factor as a function of time.

    • Main Results:

    • Negative temperature perturbation (T(1)>T(2)) showed a smooth connection between collapse stages, indicating memory persistence.
    • The chain collapse memory remained unaffected by the duration of the temperature perturbation (t(2)).
    • Positive temperature perturbation (T(1)

    Conclusions:

    • Polymer chains exhibit a 'memory effect' during collapse, retaining conformational history.
    • Temperature perturbations can either preserve or accelerate the collapse process depending on their direction.
    • This memory phenomenon is robust and independent of the perturbation duration.