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Abbe’s number

Figure 1. Refractive index (no) and Abbe s number (vd) of inorganic glasses and organic polymers condensed Iconventional polymers, Gpolymers comprising bromo phenyl group, sulfide, S-alkylester and polycyclic ring, polyurethanes 1,11 and III given in Table 2... Figure 1. Refractive index (no) and Abbe s number (vd) of inorganic glasses and organic polymers condensed Iconventional polymers, Gpolymers comprising bromo phenyl group, sulfide, S-alkylester and polycyclic ring, polyurethanes 1,11 and III given in Table 2...
Materials for optics are usually characterized by optical properties, which are mainly represented by transparency, refractive index (np) and Abbe s number (Vd). Abbe s number (Vd), describing the optical dispersion, is given by Vo=(nD-1 )/(np-nc), where Od, np and nc are the refractive indices of the material at the wavelengths of D, F and C lines of the spectrum of sodium, respectively. [Pg.188]

It is well known that the refractive index (od) can be calculated from the molar refraction [R] and molar volume V according to Lorentz-Lorenz eq. (1), where the molecule is regarded as the repeating unit of polymer structurel-. Abbe s number (Vd) is calculated with no and molar dispersion [AR] from eq. (2) ... [Pg.188]

Table 1. Optical polymer materials with relatively high refractive index (no) and Abbe s number (Vq)... [Pg.189]

Refractive index (nj,) and Abbe s number (Vp) of DMMD are 1.646 and 35.2, respectively 1. Both of these values are so large compared with those of common organic compounds that S-alkylcarbtunate comprising polyurethane with high no and Vd can be obtained from the reaction of DMMD with polyisocyanate. For instance, polyaddition with IMB or l,3-bis(isocyanatomethyl)cyclohexane (IMC) resulted in polyurethane with nu/Vo of 1.661/32.3 or 1.620/38.5, respectively . [Pg.190]

In the no vs. Vd diagram (Fig. 1), although polyurethane I, II and III have almost the same refractive indices, plots of polyurethane II and III are in the region of inorganic glasses, whereas polyurethane I is not because of low Abbe s number. Compared with the n vs. Vq... [Pg.190]

Figure 3. Refractive index vs. Abbe s number with specific gravities (values in parentheses) of commercially available eye glass lenses... Figure 3. Refractive index vs. Abbe s number with specific gravities (values in parentheses) of commercially available eye glass lenses...

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See also in sourсe #XX -- [ Pg.188 ]




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