Abstract
The contact angle measurements of the aqueous solutions of p-(1,1,3,3-tetramethylbutyl)phenoxypoly(ethylene glycol) (TX-100) and cetyltrimethylammonium bromide (CTAB) mixture with ethanol on nylon-6 were made in the range of the total concentration of CTAB and TX-100 mixture from 1 × 10−6 to 1 × 10−3 M and ethanol from 0 to 17.13 M. In the CTAB and TX-100 mixture the mole fraction of TX-100 was equal to 0; 0.2; 0.4; 0.6; 0.8 and 1. On the basis of the obtained results, the critical surface tension of nylon-6 wetting was determined from the dependence of cosine of contact angle and the adhesion tension as a function of the surface tension of the solution. This tension was compared to the components and parameters of nylon-6 surface tension taken from literature and discussed in the light of the surface excess concentration of the surface active agents at the nylon-6–solution interface calculated from the Lucassen-Reynders equation and the Gibbs isotherm.
Highlights
For that reason we investigated the wettability of nylon6 by the aqueous solutions of the mixture of two classical surfactants: cationic cetyltrimethylammonium bromide (CTAB) and nonionic Triton X-100 with ethanol in a wide range of the surfactant mixture concentration and in the whole ethanol concentration range, so that both ethanol and surfactants occurred in the solution in the monomeric or aggregated form
The basis for understanding the nylon-6 wetting by the aqueous solutions of TX-100 and CTAB mixture with ethanol is the Young’s equation (Adamson and Gast 1997): Fig. 1 The plot of the contact angle (h) of the aqueous solutions of the TX-100 and CTAB mixture with ethanol at the constant total concentration of the TX-100 and CTAB mixture equal to 1 9 10-6 M
On the basis of the contact angle measurements and the discussion of the obtained results it can be stated that: The biggest changes of the contact angle take place in the range of ethanol and the TX-100 and CTAB mixture concentration in which they are present in the monomeric form in the solution
Summary
The process of the surface wetting plays an extremely important role in everyday life and industry because the usefulness of many products like inks, adhesives, paints or cosmetics depends on the effective spreading of the wetting liquid on the solid surface (Rosen 2004; Tadros 1994; Leja 1982; Tandford and Reynolds 1976). There are many organic and inorganic additives which can modify the volumetric and surface properties of the wetting liquid and the short-chain alcohols like methanol or ethanol are the most popular among them (Rosen 2004; Zana 1995; Zdziennicka 2009a, 2010a) Depending on their concentration in the solution they can be treated as cosurfactants or cosolvents and their activity at the solidsolution interface is strongly related with the number of the carbon atoms in their chain and its branching (Rosen 2004; Zana 1995; Zdziennicka 2009a, 2010b). If the differences between the values of the contact angle measured on different sides of the water drop did not exceed ±1° and the average value of the obtained contact angle was close to those in the literature (Szymczyk et al 2012) such plates were used for investigations
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