Monolayers of bottlebrush amphiphilic polymers and their mixed monolayers with dihexadecyl phosphate at the air-water interface. The effect of cerium (III) ions and quaternization of polymers

In this work, we synthesized three bottlebrush copolymers based on methoxy[oligo(ethylene glycol)]methacrylate, methoxy[oligo(propylene glycol)]methacrylate and N-[3-(dimethylamino)propyl] methacrylamide quaternized by methyl iodide with quaternized unit fraction equaled to 5 and 20%, Mw is equal to from 4467 to 4946. The structure of the polymers was established by 1H-NMR spectra. The polymer monolayers on pure water were obtained with low pi max (17-22 mN/m), and molecular areas were equal to 9.0, 12.0 and 12.8 nm2, respectively. There were investigated mixed polymer monolayers with dihexadecyl phosphate at the air-water interface and at cerium nitrate containing subphase, LB films transferred to silicon substrate using pi-A isotherm methods, AFM, and a wetting method. The effect of cerium nitrate on double-decker structure formation at various interfaces was estimated. The approach to obtain stable monolayers of amphiphilic bottlebrush polymers using a preformed substrate from stable monolayers of compounds having an anchor group can be useful in creating new nanoscale structures or polymeric nanocontainers as a delivery system for active pharmaceutical ingredients.