Surface pressure–area isotherms and surface dilational moduli of poly (N-isopropyl acrylamide) monolayers spread at air–water interface.

Highlights: [•] Poly (N-isopropyl acrylamide) (PNIPAM) monolayers showed negative hysteresis by the compression–expansion cycles. [•] Isotherm of a given expansion process almost coincided with that of the following compression process. [•] PNIPAM showed much larger surface dilational moduli than PEO and PVAc. [ABSTRACT FROM AUTHOR]