A light scattering instrument was constructed to investigate the phase diagram and the dynamics of phase separation processes for supercritical polymer solutions. The instrument has the following features: (i) the light scattering cell withstands pressure over 34.3 MPa and temperature up to 573 K, (ii) viscous solutions such as a polymer solution can be easily handled, (iii) a rapid incremental or decremental pressure change as small as 0.01 MPa can be precisely controlled, and (iv) the angular distribution of the scattered intensity can be continuously measured over a wide angular range (0°–30°) at 100 scans/s. The phase diagram of polypropylene/trichlorofluoromethane was measured with the instrument. Some preliminary experimental results for the dynamics of the phase separation of the system are also presented.
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Kojima et al. (1995) studied this question.
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