Preparation and Characterization of Pickering Emulsions of Epoxy Oligomer Stabilized by Aerosil Particles

Abstract

Stable Pickering emulsions of the first type based on the epoxy oligomer CHS-EPOXX 530 were obtained in the presence of micro- and nanosized aerosil particles, exhibiting resistance to both coagulation and sedimentation. The dependences of rheological properties on oligomer concentration, phase volume ratio, and content of the solid stabilizing powder (aerosil) were determined. In particular, increasing the aerosil concentration led to enhanced interparticle interactions, which caused an increase in the effective viscosity of the emulsions and subsequent breakdown of the formed coagulation–thixotropic structure under low shear deformation, followed by quasi-Newtonian flow behavior. The influence of these factors on the physicomechanical properties of the resulting coatings and films produced from these emulsions was also established. The data obtained confirm the good film-forming properties of such emulsions and support their potential use as polymeric film formers in the production of paint and varnish materials containing a limited amount of organic solvents, as well as in two-component carbon fiber-reinforced adhesive formulations for the repair of structural concrete elements.