Observation of phase‐separated polymeric LB films using scanning probe microscopy

Formation of polyimide films by the Langmuir‐Blodgett (LB) method is described. The preparation and possible applications of the films are detailed. In a mixed LB film of two different polyimides, friction force microscopy reveals hexagonal islands (see Figure), which is the first observation of two‐dimensional phase separation in a polymer mixture. (Figure Presented.)