SEDL / STP / STP1183-EB / STP25127S

Effect of Polyethylene Glycol on the Adsorption of Polymeric Surface Active Agent and the Stability of Concentrated Suspensions

Memula, S
Formulation Chemist, Witco Corporation, Houston, TX

Jimenez, A
Application Manager, Witco Corporation, Houston, TX

Berger, CH
Research Chemist, Witco Corporation, Houston, TX

Pages: 14    Published: Jan 1993

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Abstract

The adsorption and the configuration of the polymeric surfactant at the solid / liquid interface are vital to the steric and electrostatic stability of suspension concentrates. The process of adsorption and the adsorption layer thickness to obtain the most stable system is a complex task and depends on many factors.

This paper discusses the stages involved in the optimization of a suspension concentrate and the results of a study of the effect of polyethylene glycol on adsorption of block polymer where the molecular weights of two components are varied. A model system was chosen to study various physico chemical properties such as adsorption, wetting, contact angle, dynamic surface tension, dilution performance, suspensibility, freeze-thaw stability, particle size, and rheology. Our results showed interesting correlations between these properties and the structure of the polymeric surfactant.