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Title: Coil-globule transition of poly(methyl methacrylate) in isoamyl acetate

Abstract

The coil-globule transition was studied by static light scattering measurements on poly(methyl methacrylate) with the molecular weight M{sub w}{times}10{sup {minus}6}=2.35 and 4.4 in isoamyl acetate. Since the phase separation of the dilute solution occurred very slowly, the measurements could be made in the broad temperature range from near the {Theta} temperature 61{degree}C to 0{degree}C 30 min after a quench of the solution. The observed expansion factor {alpha}{sup 2} for the radius of gyration was represented as a function only of {tau}M{sup 1/2} and showed a constant value at large {minus}{tau}M{sup 1/2} with {tau} being 1{minus}{Theta}/T. A quantitative comparison between a recent theory for a contracted coil and the data of {alpha}{sup 2} revealed the coil-globule crossover phenomena. The behavior of plot of 1/{alpha}{sup 3} versus {minus}{tau}M{sup 1/2} was distinctly different in the three ranges, i.e., coil range, globule range, and range of a constant {alpha}. The plot of the observed second virial coefficient A{sub 2} against temperature yielded a minimum as predicted from a theory of A{sub 2} below the {Theta} temperature. {copyright} {ital 1997} {ital The American Physical Society}

Authors:
;  [1]
  1. Department of Polymer Science, Faculty of Science, Hokkaido University, Sapporo 060 (Japan)
Publication Date:
OSTI Identifier:
542212
Resource Type:
Journal Article
Journal Name:
Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Additional Journal Information:
Journal Volume: 56; Journal Issue: 3; Other Information: PBD: Sep 1997
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; METHACRYLIC ACID ESTERS; LIGHT SCATTERING; EQUATIONS OF STATE; MOLECULAR WEIGHT; CROSSING-OVER; EXPANSION; PHASE STUDIES; ACETATES

Citation Formats

Nakata, M, and Nakagawa, T. Coil-globule transition of poly(methyl methacrylate) in isoamyl acetate. United States: N. p., 1997. Web. doi:10.1103/PhysRevE.56.3338.
Nakata, M, & Nakagawa, T. Coil-globule transition of poly(methyl methacrylate) in isoamyl acetate. United States. https://doi.org/10.1103/PhysRevE.56.3338
Nakata, M, and Nakagawa, T. Mon . "Coil-globule transition of poly(methyl methacrylate) in isoamyl acetate". United States. https://doi.org/10.1103/PhysRevE.56.3338.
@article{osti_542212,
title = {Coil-globule transition of poly(methyl methacrylate) in isoamyl acetate},
author = {Nakata, M and Nakagawa, T},
abstractNote = {The coil-globule transition was studied by static light scattering measurements on poly(methyl methacrylate) with the molecular weight M{sub w}{times}10{sup {minus}6}=2.35 and 4.4 in isoamyl acetate. Since the phase separation of the dilute solution occurred very slowly, the measurements could be made in the broad temperature range from near the {Theta} temperature 61{degree}C to 0{degree}C 30 min after a quench of the solution. The observed expansion factor {alpha}{sup 2} for the radius of gyration was represented as a function only of {tau}M{sup 1/2} and showed a constant value at large {minus}{tau}M{sup 1/2} with {tau} being 1{minus}{Theta}/T. A quantitative comparison between a recent theory for a contracted coil and the data of {alpha}{sup 2} revealed the coil-globule crossover phenomena. The behavior of plot of 1/{alpha}{sup 3} versus {minus}{tau}M{sup 1/2} was distinctly different in the three ranges, i.e., coil range, globule range, and range of a constant {alpha}. The plot of the observed second virial coefficient A{sub 2} against temperature yielded a minimum as predicted from a theory of A{sub 2} below the {Theta} temperature. {copyright} {ital 1997} {ital The American Physical Society}},
doi = {10.1103/PhysRevE.56.3338},
url = {https://www.osti.gov/biblio/542212}, journal = {Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics},
number = 3,
volume = 56,
place = {United States},
year = {1997},
month = {9}
}