Premium
Aliphatic polyureas: Melting points versus intrinsic viscosities
Author(s) -
Boenig Herman V.,
Walker Norman,
Myers Elliot H.
Publication year - 1961
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1961.070051602
Subject(s) - intrinsic viscosity , polymer , solvent , viscosity , polymer chemistry , melting point , acetone , polymerization , materials science , asymptote , thermodynamics , chemistry , organic chemistry , composite material , geometry , mathematics , physics
An homologous series of aliphatic polyureas of the type where the x = 2, 3, 4, 5, 6, 7, 8, 9, and 12, was prepared from hexamethylene diisocyanate and diamines. The polymers were obtained in powder form with the use of acetone as the solvent. The intrinsic viscosities of the phenolic solutions of these polyureas were found to decrease with increasing polymerization temperature. When the melting points of the polymers were plotted against the intrinsic viscosities within each species of polymer, these melting points were found to increase with the intrinsic viscosity. The curves so formed appeared to approach an asymptote.