Coil-globule transition of poly(methyl methacrylate) in acetonitrile

Yasuyuki Maki; Naoki Sasaki; Mitsuo Nakata

doi:10.1021/ma049208l

Coil-globule transition of poly(methyl methacrylate) in acetonitrile

Yasuyuki Maki, Naoki Sasaki, Mitsuo Nakata

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

The coil-globule transition was studied for poly(methyl methacrylate) (PMMA) in acetonitrile with molecular weights M_w = 6.4 × 10⁶ and 11.4 × 10⁶ by static light scattering. Because of the very slow phase separation, the mean-square radius of gyration was determined reliably in the temperature range from above the Θ temperature at 44.0°C down to 5°C. PMMA chains in acetonitrile collapsed slowly to equilibrium globules, and the collapse processes were measured for time periods of 30 min to 7 days depending the molecular weight and temperature. The behavior of the equilibrium expansion factor was represented as a function of (1 - Θ/TW^1/2 and compared with the theoretical predictions by Birshtein and Pryamitsyn and those by Grosberg and Kuznetsov. The second and third virial coefficients for segment interactions were estimated from the observed coil-globule transition curve by using the theories and were comparable with literature values due to the second and third virial coefficients of the dilute solution.

Original language	English
Pages (from-to)	5703-5709
Number of pages	7
Journal	Macromolecules
Volume	37
Issue number	15
DOIs	https://doi.org/10.1021/ma049208l
Publication status	Published - Jul 27 2004
Externally published	Yes

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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10.1021/ma049208l

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title = "Coil-globule transition of poly(methyl methacrylate) in acetonitrile",

abstract = "The coil-globule transition was studied for poly(methyl methacrylate) (PMMA) in acetonitrile with molecular weights Mw = 6.4 × 106 and 11.4 × 106 by static light scattering. Because of the very slow phase separation, the mean-square radius of gyration was determined reliably in the temperature range from above the Θ temperature at 44.0°C down to 5°C. PMMA chains in acetonitrile collapsed slowly to equilibrium globules, and the collapse processes were measured for time periods of 30 min to 7 days depending the molecular weight and temperature. The behavior of the equilibrium expansion factor was represented as a function of (1 - Θ/TW1/2 and compared with the theoretical predictions by Birshtein and Pryamitsyn and those by Grosberg and Kuznetsov. The second and third virial coefficients for segment interactions were estimated from the observed coil-globule transition curve by using the theories and were comparable with literature values due to the second and third virial coefficients of the dilute solution.",

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

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T1 - Coil-globule transition of poly(methyl methacrylate) in acetonitrile

AU - Maki, Yasuyuki

AU - Sasaki, Naoki

AU - Nakata, Mitsuo

PY - 2004/7/27

Y1 - 2004/7/27

N2 - The coil-globule transition was studied for poly(methyl methacrylate) (PMMA) in acetonitrile with molecular weights Mw = 6.4 × 106 and 11.4 × 106 by static light scattering. Because of the very slow phase separation, the mean-square radius of gyration was determined reliably in the temperature range from above the Θ temperature at 44.0°C down to 5°C. PMMA chains in acetonitrile collapsed slowly to equilibrium globules, and the collapse processes were measured for time periods of 30 min to 7 days depending the molecular weight and temperature. The behavior of the equilibrium expansion factor was represented as a function of (1 - Θ/TW1/2 and compared with the theoretical predictions by Birshtein and Pryamitsyn and those by Grosberg and Kuznetsov. The second and third virial coefficients for segment interactions were estimated from the observed coil-globule transition curve by using the theories and were comparable with literature values due to the second and third virial coefficients of the dilute solution.

AB - The coil-globule transition was studied for poly(methyl methacrylate) (PMMA) in acetonitrile with molecular weights Mw = 6.4 × 106 and 11.4 × 106 by static light scattering. Because of the very slow phase separation, the mean-square radius of gyration was determined reliably in the temperature range from above the Θ temperature at 44.0°C down to 5°C. PMMA chains in acetonitrile collapsed slowly to equilibrium globules, and the collapse processes were measured for time periods of 30 min to 7 days depending the molecular weight and temperature. The behavior of the equilibrium expansion factor was represented as a function of (1 - Θ/TW1/2 and compared with the theoretical predictions by Birshtein and Pryamitsyn and those by Grosberg and Kuznetsov. The second and third virial coefficients for segment interactions were estimated from the observed coil-globule transition curve by using the theories and were comparable with literature values due to the second and third virial coefficients of the dilute solution.

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Coil-globule transition of poly(methyl methacrylate) in acetonitrile

Abstract

All Science Journal Classification (ASJC) codes

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