Abstract:The refractive index of rubber was measured on an Abbe refractometer by a method of total r efl ection. For plant a tion Hevea rubber and purified rubber average values of n~ are 1. 5188 and 1. 5190, respectively. The index of crude rubber is not altered by the introduction of insoluble fillers. Sulphur in solution increases nii of crude rubber by O. 0016 for each percent, and phenyl-l1naphthylamine, by O. 001 5 for each p ercent. The refractive index of vulcanized compounds of purified rubber and sulphur is g… Show more
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