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Specific refractive index increments of segmented polyurethanes

✍ Scribed by J. Dostál; L. Šimek; V. Kašpárková; M. Bohdanecký

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
199 KB
Volume
68
Category
Article
ISSN
0021-8995

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✦ Synopsis

Specific refractive index increments n of polyester-based segmented polyurethanes in N,N-dimethyl formamide have been determined, and the quotient d n/df d has been evaluated (where f d is the weight fraction of hard-segment units). The results are in good agreement with the values calculated from group contributions to the molar refraction, using the Vogel or the Gladstone-Dale equations. The values calculated with the Lorenz-Lorentz equation are too low. A potential explanation of this fact is proposed. The same methods have been applied to reported n values for polyetherbased polyurethanes. An explanation is proposed for differences in dn/df d for polyesterand polyether-based polyurethanes.

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✍ Vincent Ball; Jeremy J. Ramsden 📂 Article 📅 1998 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 48 KB

The refractive index increment of a protein solution is a property not only of the protein, but also of the solvent. This is demonstrated theoretically and confirmed experimentally using analytical interferometry.