Adsorption of Conditioning Polymers on Solid Substrates with Different Charge Density

Abstract

The adsorption processes of polymers that belong to two different families (neutral hydrophilic polymers and cationic polysaccharide polymers) onto solid surfaces with different charge density have been studied using dissipative quartz crystal microbalance (D-QCM) and ellipsometry. The polymers studied are very frequently used in the cosmetic industry as conditioning agents. The adsorption kinetics of the polymers involves at least two steps. The total adsorbed amount depends on the charge density of the surface for both types of polymers. The comparison of the adsorbed mass on each layer obtained from D-QCM and from ellipsometry has allowed calculating the water content of the layers that reaches high values for the polymers studied. The analysis of D-QCM results also provided information about the shear modulus of the layers, whose values have been found to be typical of a rubber-like polymer system. The main driving force of the adsorption was found to be the energy of the interactions between chains and surface.

QCM-D study of nanoparticle interactions

“…[13][14] In the past ten years, we witnessed an exponential increase in the number of research groups who use QCM-D as one of main research tools for their research in liquid systems, covering a wide range of disciplines such as adsorption of lipid bilayer, [15][16] interactions of nanoparticles with clean or functionalized surfaces in aqueous solutions, [17][18][19] and adsorption kinetics of polymers, DNA and proteins on various probing substrates or immobilized bio-surfaces. [20][21][22][23][24][25][26][27][28][29] In a series of studies on the adsorption of polymers onto different solid surfaces using QCM-D [27][28][29], Guzmán et al. identified that the adsorption processes of cationic polysaccharide polymers onto solid surfaces of different charge densities were controlled by the electrostatic interactions.…”

Physicochemical Aspects of the Performance of Hair-Conditioning Formulations

“…Furthermore, these polymers can interact with the surfactants existing in the formulations, which results in the formation of polyelectrolyte-surfactant complexes. The rich phase behavior of such complexes is essential for the performance of conditioners [9,[50][51][52][53]. Some common polyquaternium polymers used in cosmetic products for hair care and conditioning are reported in Table 2 [20].…”

“…Different hydrophilic neutral polymers may be also contained in hair care formulations [53], e.g., poly[(meth)acrylic acid] (PMA), poly(acrylamide) (PAM), poly(ethylene oxide) (PEO), block and random copolymers of poly(ethylene oxide) and (propylene oxide), poly(vinyl alcohol) (PVA) and poly(vinylpyrrolidone) (PVP). The role of such polymers is generally to increase the viscosity of the formulations (thickeners).…”

“…Thus, even though the biological complexity is an important aspect of the final result of conditioning formulations, it is possible to assume that the adsorption processes are mainly determined by the surface charge of the surface and the existence of hydrophilic and hydrophobic groups on their surface [8]. This leads to a situation in which the use of model surfaces is a powerful tool for deepening the understanding of the physicochemical bases underlying the interaction of cosmetic formulations and hair fibers [50,53].…”

Colloids at Fluid Interfaces

“…There are several approaches for tuning the wettability of colloidal particles, which are based on the modification of the surface nature of the particles through chemical or physical procedures [27]. The former frequently consider the irreversible attachment of ligands onto the particle surface through a selective chemical reaction enabling the formation of covalent bonds, e.g., thiols onto gold surfaces or silanes onto SiO 2 surfaces [64][65][66]. The modification of particle wettability through physical procedures relies on the interaction (through electrostatic, van der Waals, or hydrogen bonding interactions) of particles with surface-active molecules, generally surfactants or polymers [44][45][46], but in some cases low molecular weight compounds, such as alcohols, allow modifying the wettability of the particles [47,67].…”