Abstract
Block copolymer surfactants (RBE) obtained by the addition of ethylene oxide to n-butyl, n-hexyl, n-octyl, and n-decyl ethers of mono- to tetrabutylene glycol are described. The surface activity of these nonionic surfactants has been determined, i.e., critical micelle concentration (CMC), surface excess concentration, Γ, surface area demand per molecule,A,surface tension at CMC, γCMC, andΔG°ads. A linear decrease of log CMC vs number of oxybutylene units in a copolymer molecule is observed. The change in the work of cohesion per oxybutylene group when passing from a molecular into a micellar state, calculated from the Shinoda equation, is 0.99–0.92kTfor the studied compounds. The equivalent of CH2in the aliphatic alcohol group is 1.06–1.15 oxybutylene units. Surface properties of these surfactants, i.e., cloud point, wetting ability, contact angle, and foam height, have also been determined.
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