Abstract
Neglecting turbidity leads to an overestimation of the second virial coefficient in light scattering experiments. Although this effect is totally negligible for polymers in good solvents, it is dominant for systems consisting of large compact particles and for polymers at theta conditions. The turbidity correction is proportional to the characteristic constant of light scatterning K and thus inversely proportional to λ 4. The true virial coefficient can be obtained by extrapolation of Kc/ R to vanishing value of K. Light scattering of a well characterized sample of polystyrene in cyclohexane at three different wavelengths and several temperatures has been used to demonstrate the correction for turbidity. The true second virial coefficient for polystyrene in cyclohexane at various temperatures was obtained. Theta temperature and the entropic factor ψ were found to be 35.4°C and 0.21, respectively. Alternative procedures for evaluating the correction using light scattering data measured at a single wavelength were also offered.
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