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

doi:https://doi.org/10.1103/PhysRevE.56.3338

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

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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:

Nakata, M; Nakagawa, T ^[1]

Department of Polymer Science, Faculty of Science, Hokkaido University, Sapporo 060 (Japan)

Publication Date:: 1997-09-01

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.

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                    Nakata, M, & Nakagawa, T. Coil-globule transition of poly(methyl methacrylate) in isoamyl acetate.  United States.  https://doi.org/10.1103/PhysRevE.56.3338

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                    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.

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@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}

}

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