MECHANICAL DEGRADATION OF HIGH MOLECULAR WEIGHT POLYMER WITH SURFACTANT ADDITION IN A ROTATING DISK APPARATUS

Abstract

Mechanical degradation hampers the practical usage of polymers for turbulent drag reductionapplication. Mechanical degradation refers to the chemical process in which the activation energy ofpolymer chain scission is exceeded by mechanical action on the polymer chain, and bond ruptureoccurs. When a water-soluble polymer and surfactant are mixed in water solution, the specific structures(aggregates) are formed, in which polymer film is formed around micelle. In this work, Xanthan gum (XG) –Sodium lauryl ether sulfate (SELS) complex formation and its effect on percentage viscosity reduction(%VR) was studied. It was found that SELS surfactant reduced the mechanical degradation of XG muchmore efficiently than this polymer alone. Xanthan Gum (XG) has been tested for its shear stability anddegradability. 0.5% and 1.0 % by weight concentration solutions were exposed to shear stirring at differentspeeds and time; also 0.5% through 1.5% by weight concentration solutions of SELS were added to XGsolutions to determine the ability of SELS to reduce the mechanical degradation of XG. It has been noticedby measuring the percentage viscosity reduction (%VR) of the mixture of XG-SELS that the % VRdecreases when added this surfactant to XG polymer