Memory effect in the collapse process of isolated polymer chains in a solution

Yasuyuki Maki; Naoki Sasaki; Mitsuo Nakata

Memory effect in the collapse process of isolated polymer chains in a solution

Yasuyuki Maki, Naoki Sasaki, Mitsuo Nakata

Research output: Contribution to conference › Paper › peer-review

Abstract

The effect of a temperature perturbation at T ₂ on the chain collapse process at T ₁ < θ was studied for poly(methyl methacrylate)(M _w) = 1.1 × 10 ⁷) in the mixed solvent of tert-butyl alcohol + water(2.5vol%). The solution was quenched from θ to T ₁ and preserved at the temperature for a period of t ₁=300 min. Then the temperature was rapidly changed to T ₂ and kept for t ₂=1440 min. Finally the temperature was changed back to T ₁. The chain collapse/expansion process was described by time evolution of expansion factor α ², which was determined by static light scattering measurements. For T ₂ < T ₁, the collapse process at T ₁ seemed not disturbed by the temperature perturbation at T ₂ (memory effect). For T ₂ > T ₁, the collapse process at T ₁ was accelerated or decelerated depending on T ₂.

Original language	English
Number of pages	1
Publication status	Published - Dec 1 2005
Externally published	Yes
Event	54th SPSJ Symposium on Macromolecules - Yamagata, Japan Duration: Sep 20 2005 → Sep 22 2005

Other

Other	54th SPSJ Symposium on Macromolecules
Country	Japan
City	Yamagata
Period	9/20/05 → 9/22/05

All Science Journal Classification (ASJC) codes

Engineering(all)

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title = "Memory effect in the collapse process of isolated polymer chains in a solution",

abstract = "The effect of a temperature perturbation at T 2 on the chain collapse process at T 1 < θ was studied for poly(methyl methacrylate)(M w) = 1.1 × 10 7) in the mixed solvent of tert-butyl alcohol + water(2.5vol%). The solution was quenched from θ to T 1 and preserved at the temperature for a period of t 1=300 min. Then the temperature was rapidly changed to T 2 and kept for t 2=1440 min. Finally the temperature was changed back to T 1. The chain collapse/expansion process was described by time evolution of expansion factor α 2, which was determined by static light scattering measurements. For T 2 < T 1, the collapse process at T 1 seemed not disturbed by the temperature perturbation at T 2 (memory effect). For T 2 > T 1, the collapse process at T 1 was accelerated or decelerated depending on T 2.",

author = "Yasuyuki Maki and Naoki Sasaki and Mitsuo Nakata",

year = "2005",

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language = "English",

note = "54th SPSJ Symposium on Macromolecules ; Conference date: 20-09-2005 Through 22-09-2005",

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TY - CONF

T1 - Memory effect in the collapse process of isolated polymer chains in a solution

AU - Maki, Yasuyuki

AU - Sasaki, Naoki

AU - Nakata, Mitsuo

PY - 2005/12/1

Y1 - 2005/12/1

N2 - The effect of a temperature perturbation at T 2 on the chain collapse process at T 1 < θ was studied for poly(methyl methacrylate)(M w) = 1.1 × 10 7) in the mixed solvent of tert-butyl alcohol + water(2.5vol%). The solution was quenched from θ to T 1 and preserved at the temperature for a period of t 1=300 min. Then the temperature was rapidly changed to T 2 and kept for t 2=1440 min. Finally the temperature was changed back to T 1. The chain collapse/expansion process was described by time evolution of expansion factor α 2, which was determined by static light scattering measurements. For T 2 < T 1, the collapse process at T 1 seemed not disturbed by the temperature perturbation at T 2 (memory effect). For T 2 > T 1, the collapse process at T 1 was accelerated or decelerated depending on T 2.

AB - The effect of a temperature perturbation at T 2 on the chain collapse process at T 1 < θ was studied for poly(methyl methacrylate)(M w) = 1.1 × 10 7) in the mixed solvent of tert-butyl alcohol + water(2.5vol%). The solution was quenched from θ to T 1 and preserved at the temperature for a period of t 1=300 min. Then the temperature was rapidly changed to T 2 and kept for t 2=1440 min. Finally the temperature was changed back to T 1. The chain collapse/expansion process was described by time evolution of expansion factor α 2, which was determined by static light scattering measurements. For T 2 < T 1, the collapse process at T 1 seemed not disturbed by the temperature perturbation at T 2 (memory effect). For T 2 > T 1, the collapse process at T 1 was accelerated or decelerated depending on T 2.

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T2 - 54th SPSJ Symposium on Macromolecules

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