Abstract
The coil-globule transition was studied by static light scattering measurements on poly(methyl methacrylate) with the molecular weight 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 Θ temperature 61 °C to 0 °C 30 min after a quench of the solution. The observed expansion factor for the radius of gyration was represented as a function only of and showed a constant value at large with τ being A quantitative comparison between a recent theory for a contracted coil and the data of revealed the coil-globule crossover phenomena. The behavior of plot of versus was distinctly different in the three ranges, i.e., coil range, globule range, and range of a constant α. The plot of the observed second virial coefficient against temperature yielded a minimum as predicted from a theory of below the Θ temperature.
- Received 18 February 1997
DOI:https://doi.org/10.1103/PhysRevE.56.3338
©1997 American Physical Society