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

Yasuyuki Maki, Naoki Sasaki, Mitsuo Nakata

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The effect of temperature perturbation on a single-chain-collapse process was studied for poly(methyl methacrylate) with the molecular weight M w=1.05×107 in the mixed solvent of tert-butyl alcohol+water (2.5 vol%). In the chain-collapse process after a quench from the θ temperature to a temperature T1, the temperature was changed from T1 to T2 at the time t1 after the quench and returned to T1 at the time t1+t2. In the three stages at T1, T2, and T1, measurements of the mean-square radius of gyration of polymer chains were carried out by static light scattering and the chain-collapse process was represented by the expansion factor as a function of time. An effect of chain aggregation on the measurements was negligibly small because of the very slow phase separation. For the negative temperature perturbation (T1>T2), the chain-collapse processes observed in the first and third stages were connected smoothly and agreed with the collapse process due to a single-stage quench to T1. A memory of the chain collapse in the first stage at T 1 was found to persist into the third stage at the same temperature T1 without being affected by the temperature perturbation of T 2 during t2. The memory effect was observed irrespective of the time period of t2. The positive temperature perturbation (T1<T2) showed an acceleration of the chain-collapse process.

Original languageEnglish
Pages (from-to)12690-12695
Number of pages6
JournalJournal of Chemical Physics
Volume121
Issue number24
DOIs
Publication statusPublished - Dec 22 2004
Externally publishedYes

Fingerprint

Polymer solutions
Data storage equipment
polymers
perturbation
Temperature
temperature
tert-Butyl Alcohol
gyration
Polymethyl Methacrylate
polymethyl methacrylate
Phase separation
Light scattering
molecular weight
Polymers
alcohols
light scattering
Agglomeration
Molecular weight
radii
expansion

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Memory effect in the chain-collapse process in a dilute polymer solution. / Maki, Yasuyuki; Sasaki, Naoki; Nakata, Mitsuo.

In: Journal of Chemical Physics, Vol. 121, No. 24, 22.12.2004, p. 12690-12695.

Research output: Contribution to journalArticle

Maki, Yasuyuki ; Sasaki, Naoki ; Nakata, Mitsuo. / Memory effect in the chain-collapse process in a dilute polymer solution. In: Journal of Chemical Physics. 2004 ; Vol. 121, No. 24. pp. 12690-12695.
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