Dynamic Mechanical Properties of Networks of Wormlike Micelles Formed by Self-Assembled Comblike Amphiphilic Copolyelectrolytes

• DOI: 10.1021/acs.macromol.6b01369
• Publication Date: 2016-09-08T13:42:20Z
• Authors: Fabien Dutertre; Lazhar Benyahia; Christophe Chasse...; Taco Nicolai
• Keywords: Branching (polymer chemistry); Polystyrene; Percolation (cognitive psychology)

The rheological properties of viscoelastic aqueous solutions wormlike micelles formed by the self-assembly comblike copolyelectrolytes have been investigated flow and dynamic measurements. polymers consisted a polystyrene backbone grafted with fixed amount pendant N,N-dimethyl quaternary ammonium alkyl groups various lengths ranging from C12 up to C18. Upon increasing concentration, increase in size their branching results formation system spanning network through percolation process at critical concentration that decreases when salt is added or temperature decreased. In this manner transient gels are relaxation time does not depend on polymer ionic strength, but elastic modulus increases concentration. When increased C16, very strongly, dependence remains characterized same activation energy. For C18, systems frozen least 80 °C.