The research of modifiers competitive adsorption on polymer-cement system particles for additive technolodies
Abstract
Polymer and mineral dispersions have highly-developed surface possessing surface energy excess; consequently, coagulation processes may take place during polymer-mineral system making. Aggregate stable modified polyvinyl-acetate cement systems for additive technologies mean simultaneous presence of more than one surface-active material - phloroglucinefurfurol oligomers and polyvinyl alcohol. Polyvinyl
alcohol is added into the system at the stage of vinyl acetate polymerisation as the stabilizer of the polymer dispersion. The phloroglucinefurfurol plasticizer provides the system rheology demanded by innovative technologies. The research of competitive adsorption of surface-active materials is of great interest. The authors of the work have used the method of ultraviolet spectroscopy to get adsorption isotherms of oligomer molecules of phloroglucinefurfurol superplasticizer on particles of multicomponent dispersions. The refractometric analysis with the help of additives has made it possible to study the desorption process of polyvinyl alcohol molecules from the surface of polyvinyl acetate particles during polymer-cement system making. The process of desorption takes place as a result of dispersion dilution with hardening water, while adding highlydispersive mineral powder (cement) and as a result of competitive adsorption of phloroglucinefurfurol oligomers.
The up-to-date instrument for determining the contact angle, KRUSS Easy Drop DSA-30 (Germany), has been used to research colloid-chemical characteristics of mineral and polymer surfaces in conjunction with dispersion medium, containing surface-active materials under study. The works demonstrates dependences of surface tension and contact angles on polyvinyl alcohol concentration and phloroglucinefurfurol
superplasticizer. It has been proved that phloroglucinefurfurol oligomers possess bigger surface activity on the boundary «polyvinyl acetate – dispersion medium of polymer-cement system» than polymer molecules of polyvinyl alcohol. The colloid-chemical properties and interaction patterns of explored surfaceactive materials on the phase boundary of multicomponent dispersions have significant importance not only
for colloid chemistry but for modern innovative science and engineering as well.
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