THE PREPARATION AND TRANSFER CHARACTERISTICS OF POLYIMIDE LANGMUIR-BLODGETT-FILM FOR LIQUID-CRYSTAL ALIGNMENT

The monolayer stability of polyamic acid salts (PAAS) increases as the chain length of salts increases and the hysteresis of the pi-A isothe rms is found when compressed and expanded. The transferabilities of th e monolayers were sharply influenced by the stability at the interface , but not affected by the dipping conditions. In a well-balanced condi tion, the Langmuir film is transferred as a Y-type on various substrat es. The thickness of PAAS was found to be 16.7 Angstrom. After imidiza tion, it was reduced to 5.6 Angstrom per layer, but some ordered struc tures sustained.