Polyamides in solution—IV Viscometry of branched polycaprolactam

✍ Scribed by R. Francesconi; G.B. Gechele; A. Mattiussi

• Book ID: 103070431
• Publisher: Elsevier Science
• Year: 1969
• Tongue: English
• Weight: 449 KB
• Volume: 5
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(69)90123-2

✦ Synopsis

The viscometric properties of branched eight star shaped polycaprolactam have been determined. Measurements have been carried out at different temperatures in the solvents: 58y, formic acid, 64.5 ~. formic acid, 85 ~o formic acid and m-cresol. By making use of the Kron and Ptitsyn formulations, it was possible to calculate values of intrinsic viscosity which were rather similar to the experimental ones; results indicate that the above polymer shows a configuration which is very near to the free-draining model in formic acid, while in m-cresol the non-draining model prevails.

For the polymer in 64.5 ~. formic acid, the plot intrinsic viscosity-temperature shows a sinusoidal shape; such a behaviour has also been noticed by other authors for different polymers; however, a satisfactory explanation of the phenomenon has not so far been given.