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Citation: KIANG MING, LI WEIN-TSIN. STUDIES OF THE DILUTE SOLUTION PROPERTIES OFPOLYSTYRENE-METHYLETHYLKETONE-HEXANE SYSTEM[J]. Acta Polymerica Sinica, ;1964, 6(5): 356-362. shu

STUDIES OF THE DILUTE SOLUTION PROPERTIES OFPOLYSTYRENE-METHYLETHYLKETONE-HEXANE SYSTEM

KIANG MING ,
LI WEIN-TSIN

The intrinsic viscosities of five polystyrene (PS) fractions in mixed solvents of methylethyl ketone (MEK) and hexane were determined．When the intrinsic viscosities are plotted against the solvent compositions，there appears a maximum at the volume fraction of hexane γ=0.13． The light scattaring measurements of a PS fraction in seven mixed solvents of varied compositions show that the values of the second virial coefficient A，also pass through a maximum at γ=0.13． The above results are inter-preted by means of solubility parameters，that of PS lies between those of MEK and hexane．From our experimental results．a solubility parameter of 8.8 for PS is suggested．The θ-composition of PS-MEK-hexane at 30.0℃ was determined both from light scattering and viscosicy measurements；the results obtained are in agreement with each other and γθ=0.45．
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