The viscoelasticity of spinnable solutions of alkyltrimethylammonium salicylates.

The viscoelasticity has been measured for aqueous solutions of tetradecyl-and hexadecyltrimethylammonium salicylates (CTASal, CTASal). The aqueous solutions of CTASal without salt displayed the gel-like behavior at 10.0×10 g cm, but those more dilute than 3.2×10 g cm presented the viscoelasticity similar to that of a Maxwell liquid. The Maxwell-like behavior was converted to the polymer-like one on the addition of (0.1-0.2) M NaBr or (0.02-0.2) M NaSal. The gel-like viscoelasticity can be connected with the spinnability of 'cohesive fracture failure', and the Maxwell-like and polymer-like viscoelasticities are concerned with the spinnability of 'ductile failure'. The gel-like and Maxwell-like viscoelasticities originate in the pseudo-network formed by the pseudo-linkages between rodlike micelles, while the polymer-like viscoelasticity is caused by the entanglement of long rodlike micelles in semidilute and concentrated solutions. The aqueous solutions of CTASal behaved very similar to those of CTASal. [ABSTRACT FROM AUTHOR]