The Turbidity of 8-Arm Polystyrene in Methylcyclohexane in the One-Phase Region Near the Critical Solution Point: A Small Step in Determining the Effects of Polymer Architecture on Critical Amplitudes

Clinton Ignatius Braganza

An experiment was designed to determine the effect of polymer architecture on the correlation length amplitude ξo. This amplitude was obtained by fitting a theoretical function based on Ornstein-Zernike theory to turbidity data of 8-arm polystyrene (Mw = 282 400) in methylcyclohexane close to the critical solution point. The correlation length amplitude obtained was 1.044 ± 0.068 nm, this value seems to be within the experimental error of data available for linear polystyrene in methylcyclohexane for the same molecular weight of polystyrene. It was also found that the star architecture did not affect the critical composition as expected.