ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Interaction Studies of Nonionic Emulsifiers and Carboxymethylstarch and Polymerization of Vinyl Acetate

I. Capek, S. Janíčková, P. Capek, J. Kováčik, and P. Koštial

Polymer Institute, Slovak Academy of Sciences, SK-842 36 Bratislava

E-mail: upolign@savba.sk

Received: 23 September 2003

Abstract: The organized association of amphiphilic nonionic emulsifiers in the aqueous phase with and without hydrophilic additive (starch) was investigated. The surface tension and conductivity were used to study the association behaviour of amphiphiles. The surface tension of the aqueous solutions of hydrophilic nonionic emulsifiers Slovasol 2520, Slovasol 2430, Slovanik 1070/7, and Sloviol P88-08 (hydrophilic-lipophilic balance, HLB > 15) and anionic emulsifier Slovafos 1M is described by a curve with two straight lines and the break at the critical micellar concentration. Some deviation from the ideal behaviour was observed with Tween 20. The nonideal micellar behaviour was observed with the hydrophobic emulsifier Tween 85 where the surface tension vs. conversion curve was described by a curve with minimum at the critical micellar concentration. The addition of polysaccharide – carboxymethylstarch – does not influence the shape of surface tension curve but increases the surface tension. The noncooperative interaction between the hydrophilic polysaccharide and nonionic emulsifier shifts the critical aggregation concentration to the higher emulsifier concentrations.

Full paper in Portable Document Format: 591a48.pdf

Chemical Papers 59 (1) 48–54 (2005)