Abstract
Abstract The polyimide films were prepared by imidizing the polyamic acid long-chain alkylamine (dimethylhexadecylamine) salt films with a thermal treatment up to 300C°C for 30 minutes, where the polyamic acid alkylamine salt films were formed on various substrates by using Langmuir-Blodgett (LB) method. The imidization of polyamic alkylamine salt films with various thickness were identified with FT-IR and UV-visible absorption spectroscopies. Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM) have been used to investigate the surface morphology of polyamic acid alkylamine salt and imidized films with a thickness from one monolayer to ten monolayers. It was found that the imidization of the polyamic acid alkylamine salt films with a thermal treatment significantly increases the surface microroughness of those films by forming sub-micron order of polyimide grains on substrates and no defects such as pin holes were observed by SEM analysis.
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