Summary
Electrical, birefringence of Dimethyl Terephthalate (DMT) and Poly (Diethylene Glycol Terephthalate) (PDET) in p-dioxane solutions were measured at 20°C. The results were used to compute molar Kerr constants of both compounds at infinite dilution. The experimental results were 〈mK〉= = 780 and 〈mK〉= -732, both in units of 10−27m5V−2 mol−1, for DMT and PDET respectively. Theoretical analysis of 〈mK〉 of DMT indicates that the inductive effects that prevent the additivity of
tensors of benzene and ester groups account for about 12% of the value of 〈mK〉. The
tensor obtained for DMT was used, together with literature values of all the non optical parameters, to calculate 〈mK〉/x of PDET according to the RIS model. The concordance between theoretical and experimental results of this magnitude is excellent.
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