Electric birefringence and conformation of polychlorohexylisocyanate in solutions

✍ Scribed by V.N. Tsvetkov; E.I. Rjumtsev; N.V. Pogodina; J.N. Shtennikova

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 408 KB
• Volume: 11
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(75)90172-x

✦ Synopsis

Electric birefringence was investigated for solutions of polychlorobexylisocyanate fractions for molecular weights 3ff6 x 104-1.2 x 104 in tetrachloromethane.

Experimentally found dispersion of the Kerr effect is used for estimating the coefficients of rotatory diffusion D, of molecules. A comparison of rotatory diffusion D, values with molecular weights M and intrinsic viscosities of fractions shows that the value of D,M[q] decreases with M. This illustrates the change in the conformation of molecules from a random coil to a rod.

On the basis of experimental dependences of D, and the Kerr constants K on M, the main structural parameters of the polymer investigated were determined: the number of monomer units in a segment, the projection of the length of the monomer unit on the axis of the molecule, the value of the dipole moment Po of the monomer unit and the angle formed by/a o and the chain direction.