The viscometric behaviour of high molecular mass polyamide 6, prepared by activated anionic polymerization of e-caprolactam in a twin-screw extruder, has been studied in 90% formic acid. Results obtained show that viscosity number increases with polymer concentrations to -,~ 0.001 or 0.0015 g ml-1, but unexpectedly declines thereafter. Whereas anomalous results are obtained at a concentration level of 0.005gml-~, as specified in ISO 307:1984, at very low solution concentration, viscometry data correlate well with findings from g.p.c.
Посилання на статтю:
Observations on the determination of polyamide 6 viscosity number / P. R. Hornsby* and J. F. Tung // Polymer. – 1994. – Vol 35. – P. 3799-3800.