Abstract
AbstractThe properties of amphiphilic copolymers (poly(2‐(dimethylamino)ethyl methacrylate)‐block‐poly(acrylic acid), PDMAEMAm‐b‐PAAn) and their complexes with a traditional surfactant (dimethyldioctadecylammonium bromide) and a novel Gemini surfactant, (propanediyl‐bis(dimethyloctadecylammonium bromide) ([C18H37(CH3)2N+‐(CH2)3‐N+(CH3)2 C18H37]·2Br−, 18‐3‐18), at the air/water interface were investigated. Surface tension and surface pressure were used to monitor the surface behavior of these systems, and atomic force microscopy was used to visualize the morphology of the corresponding Langmuir–Blodgett film. PDMAEMAm‐b‐PAAn can form surface micelles at the air/water interface and the addition of surfactants can significantly influence the structure of the complex film due to electrostatic interaction and hydrophobic interaction. In particular, the spacer in a Gemini surfactant can act as a bridge to connect different PDMAEMA70‐b‐PAA60 micelles, which is favorable for the formation of a necklace‐like structure. This originates from that one head group can interact with a PDMAEMA70‐b‐PAA60 molecule, and the other head group can interact with another PDMAEMA70‐b‐PAA60 molecule, which might belong to different micelles. The results suggest that the special interfacial structures and performances of Gemini/PDMAEMA‐b‐PAA complexes are caused by the unique molecular structures of the Gemini surfactant.
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