Transformations of Thermosensitive Hyperbranched Poly(ionic liquid)s Monolayers

• DOI: 10.1021/acs.langmuir.9b01905
• Publication Date: 2019-08-16T15:28:54Z
• Authors: Hansol Lee; Alexandr V. Stryu...; Volodymyr F. Koro...; Emily Mikan; Valery V. Shevchenko; Vladimir V. Tsukruk
• Keywords: 01 natural sciences; 0104 chemical sciences

We synthesized amphiphilic hyperbranched poly(ionic liquid)s (HBPILs) with asymmetrical peripheral composition consisting of hydrophobic n-octadecylurethane arms and hydrophilic, ionically linked poly(N-isopropylacrylamide) (PNIPAM) macrocations studied low critical solution temperature (LCST)-induced reorganizations at the air-water interface. observed that morphology HBPIL Langmuir monolayers is controlled by surface pressure uniform well-defined disk-like domains formed in a liquid phase. These are merged transformed to elevated ridge-like network structures representing coalesced interdomain boundaries solid phase because branched architecture chemical stabilize under high compression. Above LCST, individual islands aggregation collapsed hydrophobized PNIPAM terminal The presence thermoresponsive initiates monolayer reorganization LCST transformation mechanical contrast distribution. heterogeneity elastic response adhesion distributions for wet state changed from highly contrasted two-phase distribution below near-uniform above hydrophilic