THE VISCOELASTICITY OF SPINNABLE SOLUTIONS OF ALKYLTRIMETHYLAMMONIUM SALICYLATES

The viscoelasticity has been measured for aqueous solutions of tetradecyl- and hexadecyltrimethylammonium salicylates (C14TASal, C16TASal). The aqueous solutions of C14TASal without salt displayed the gel-like behavior at 10.0 x 10(-2) g cm-3, but those more dilute than 3.2 x 10(-2) g cm-3 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 C16TASal behaved very similar to those of C14TASal.