WELL-ORDERED STRUCTURE AND PHASE-TRANSITION BEHAVIORS OF A REVERSED DUCKWEED POLYMERIC LANGMUIR-BLODGETT-FILM STUDIED BY FOURIER-TRANSFORM INFRARED-SPECTROSCOPY AND SMALL-ANGLE X-RAY-DIFFRACTION

A Reversed Duckweed polymeric Langmuir-Blodgett (LB) film was characte rized by Fourier transform infrared (FTIR) spectroscopy. It has a well -ordered structure which is similar to that of the monomer-octadecylac rylamide-LB film, which provides proof that the flexible hydrophilic n etwork does not interfere the side-chain alignment. The phase transiti on behavior was studied by using temperature dependent FTIR and small- angle X-ray diffraction. The LB film shows a unique thermal transition behavior, which undergoes a three-phase transition processes: from a highly ordered structure transition into a melted disordered state thr ough two Langmuir-Blodgett ''liquid crystal'' states.