Abstract
Abstract The specific refractive index increments (v) of polybutadiene (PB) at 5460 and 4360 A wavelengths and of styrene-butadiene rubber at 4360 A wavelength were determined in various solvents, whereas the values of v for crepe rubber at 5460 and 4360 A and for polystyrene, polymethyl methacrylate, and styrene-methyl methacrylate at 5460 A wavelength were taken from the literature. From these values mathematical equations are proposed whereby the refractive index of these polymers can be determined from the refractive index of solvents only. The variation of v with molecular weight was also studied by fractionating PB and determining the u of these different molecular weight samples. No significant difference in the v values could be observed in the molecular weight range of 33,000 to 350,000.
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