Abstract
The present research investigates the intricate interplay between some industrially essential compounds, viz. 2-methylphenol (o-cresol, OC), 4-methylphenol (p-cresol, PC), 4-n-Butylphenol (BP) and non-linear ethylene oxide-propylene oxide (EO-PO) type block copolymers (Tetronics®) in aqueous solutions by employing an array of physico-chemical techniques. Each examined Tetronic® possesses 40% EO segments in its molecular structure. The study delves into the interaction and structural modifications that occur when cresols are doped into the copolymer solutions. The added cresols disrupt the hydrophilic-hydrophobic balance of Tetronics® depending on their hydrophobicities. The lowering of the cloud point (CP) is accompanied by a corresponding increase in solution viscosity. Doping of OC and PC has a dissimilar effect on viscosity compared to BP. The intermicellar interactions are adjudged to be probable cause of the unusual viscosity trend. Scattering techniques (DLS and SANS) confirm the morphology of aggregates. The results are interpreted in terms of H-bonding.
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