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.
| Original language | English |
|---|---|
| Pages (from-to) | 5703-5709 |
| Number of pages | 7 |
| Journal | Macromolecules |
| Volume | 37 |
| Issue number | 15 |
| DOIs | |
| Publication status | Published - Jul 27 2004 |
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All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry
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Coil-globule transition of poly(methyl methacrylate) in acetonitrile. / Maki, Yasuyuki; Sasaki, Naoki; Nakata, Mitsuo.
In: Macromolecules, Vol. 37, No. 15, 27.07.2004, p. 5703-5709.Research output: Contribution to journal › Article
}
TY - JOUR
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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U2 - 10.1021/ma049208l
DO - 10.1021/ma049208l
M3 - Article
AN - SCOPUS:3943050710
VL - 37
SP - 5703
EP - 5709
JO - Macromolecules
JF - Macromolecules
SN - 0024-9297
IS - 15
ER -