A study on the preparation of aromatic polyimide Langmuir-Blodgett films

The PI Langmuir-Blodgett (LB) films were prepared by imidizing the PAAS LB films of PMDA and benzidine system with a thermal treatment at 250 degreesC for 30 min, where the PAAS LB films were formed on substrates by using LB technique. The imidization of PAAS LB films with various thickness were identified with UV-VIS and Fr-IR absorption spectroscopies. The PAAS and PI LB films have been characterized by electric capacitance measurement. The thicknesses of one layer of PAAS and PI LB film that deposited at the surface pressure of 27 mN/m were 20.9 and 4 Angstrom, respectively. lt was found that the PAAS and PI LB films formed well with molecular order was fabricated. SEM has been used to investigated the surface morphology of PAAS and PI LB films. (C) 2001 Elsevier Science B.V. All rights reserved.