Salt Effect on the Solution Properties of Cationic Gemini/Conventional Surfactants in the Presence of the Nonionic Polymer Hydroxypropylmethyl Cellulose

Abstract

In this article, we report the salt effect on interaction of a water‐soluble polymer hydroxypropylmethyl cellulose (HPMC) with the cationic Gemini surfactant (ethane‐1, 2‐diyl bis(N,N‐dimethyl‐N‐hexadecylammoniumacetoxy) dichloride, 16‐E2‐16), and also its monomeric counterpart cetyltrimethylammonium chloride (CTAC) using the tensiometric method. Surface tension of the amphiphiles diminished in the presence of the polymer as well as salts; eventually, the polymer gets saturated with the surfactant and there is no further change of surface tension of the solution. Interaction between the polymer and surfactant starts at the critical aggregation concentration (CAC) that is stronger for 16‐E2‐16 than CTAC. CAC and critical micelle concentration (CMC) values of the surfactant‐polymer binary mixtures at various concentrations of the polymer were determined. CAC as well as CMC of 16‐E2‐16 are considerably lower than CTAC. The inorganic salts (KCl and KBr) have a considerable influence on the polymer–surfactant interaction.

Preparation and Characterization of Biobased Dehydroabietyl Polyethylene Glycol Glycidyl Ether-Grafted Hydroxyethyl Cellulose with High Emulsifying Property

“…Surfactants are amphiphilic molecules with polar hydrophilic groups and non-polar hydrophobic groups [1,2]. Compared with small molecular surfactants, polymer surfactants have higher molecular weight, in the range of thousands and above [3], along with higher viscosity, which is beneficial to film formation [4], emulsification [5], dispersion [6], thickening [7], flocculation [8] and wetting [9]. At present, people are paying more and more attention on how to use biomass-based renewable feedstocks for new generation green materials to replace the current petrochemical-based products to reduce environmental strain, tackle the issue of energy shortage and eliminate reliance on non-biodegradable resource, which is crucial for the sustainability of our society [10][11][12][13].…”