✦ LIBER ✦

Conformation and physical properties of polyisocyanates in solution

✍ Scribed by V.N. Tsvetkov; I.N. Shtennikova; E.I. Rjumtsev; Yu.P. Getmanchuk

Publisher: Elsevier Science
Year: 1971
Tongue: English
Weight: 380 KB
Volume: 7
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(71)90042-5

No coin nor oath required. For personal study only.

✦ Synopsis

Hydrodynamic, dynamo-optical and electro-optical properties of aromatic (ArlC) and aliphatic (AIIC) polyisocyanates in solution have been investigated. Experimental data show that ArIC in solution has the statistical coil conformation. The flexibility of the chain corresponds to that of typical molecules of synthetic polymers.

In contrast, the optical properties of AIIC solutions in nonpolar solvents indicate that the molecular shape resembles a weakly bending rod, while the molecular chain is characterized by a high degree of intramolecular orientational order.

Application of the theory of hydrodynamic and optical properties of wormlike (persistent) chains to the experimental data permits calculation of the optical anisotropy, dipole moment and persistence length of the AIIC molecules. The values obtained are similar to those for synthetic polypeptides in the a-helical conformation.

The data show that the most probable conformation of AIIC in nonpolar solvents is the planar c/s chain.

📜 SIMILAR VOLUMES

Physical properties of rod-shaped molecu

Physical properties of rod-shaped molecules in solution

✍ Donald I. Stimpson; Victor A. Bloomfield 📂 Article 📅 1985 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 631 KB

Several theories describing the physical properties of solutions containing rod-shaped molecules are reviewed. The results of the various theories are presented in a convenient form for implementation on a calculator or microcomputer. Expressions are derived for light scattering from thin rods using

Conformational properties of methionine

Conformational properties of methionine homo-oligopeptides in solution

✍ Gian Maria Bonora; Claudio Toniolo 📂 Article 📅 1974 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 561 KB

## Abstract A conformational analysis was carried out in solution on a series of L‐methionine oligomers having the general formula \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm BOC\rlap{--} (L - Met\rlap{--})}\_n {\rm OMe (}n = 2 - 7)$\end{document}. We examined these oligopeptides

Conformational and optical properties of

Conformational and optical properties of (acetoxypropyl)cellulose molecules in solutions

✍ I.N. Shtennikova; E.V. Korneeva; G.F. Kolbina; I.A. Strelina; P.N. Lavrenko; V.P 📂 Article 📅 1992 🏛 Elsevier Science 🌐 English ⚖ 460 KB

Almtraet--The molecular properties of oxypropyl cellulose acetate (APC) with an average molar degree of substitution DS = 2.25 were investigated by flow birefringence, sedimentation, diffusion and viscometry. In the range of molecular weight (M) from 3 • 103 to 202 • 103, the relationships between i

Hydrodynamic and dynamo-optical properti

Hydrodynamic and dynamo-optical properties and conformation of cyanoethyl cellulose molecules in solution

✍ V.N. Tsvetkov; P.N. Lavrenko; L.N. Andreeva; A.I. Mashoshin; O.V. Okatova; O.I. 📂 Article 📅 1984 🏛 Elsevier Science 🌐 English ⚖ 538 KB

Translational diffusion, velocity sedimentation and viscosity in acetone as well as flow birefringence (FB) and viscosity in cyclohexanone have been investigated for cyanoethyl cellulose (CEC) with degree of substitution 2.6 in the range of M = (24.5-317) × 10 ~. The dependences of [q], S O and D 0

Conformation of Medazepam in Solution

✍ Emil Finner; Horst Zeugner; Wolfgang Milkowski 📂 Article 📅 1985 🏛 John Wiley and Sons 🌐 English ⚖ 163 KB 👁 1 views

Conformation of tetranactin in solution

✍ Yoshimasa Kyogoku; Masaharu Ueno; Hideo Akutsu; Yoshiharu Nawata 📂 Article 📅 1975 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 720 KB

## Abstract The conformation of tetranactin, an ionophore, in chloroform was investigated by infrared and Raman spectra and by proton and ^13^C magnetic resonances. The infrared spectra show that the structure of its K^+^ complex in the solution is quite similar to that in crystals. The proton spin