Abstract
AbstractAs in the case with other polymers previously reported, the values of the refractive index increment dn/dc of polyethylene and the n‐alkanes change with molecular weight. Most of the variation may be understood by examination of the role of density in the Lorentz‐Lorenz mixing equation for specific refractivity, R12 = p1R1 + P2R2 used to calculate dn/dc. It may also be shown that as the absolute refractive index difference between solute and solvent becomes smaller, dn/dc becomes more sensitive to density change of the solute.
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