Preparation of a fully aliphatic polyimide for application to flexible and transparent substrate film
발표자
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초록
내용
Fully aliphatic polyimides have been receiving attention as a flexible plastic substrate for applications in inter-layer dielectric materials, optoelectronics, and various microelectronic industries because of their high transparency and low dielectric constants when compared with aromatic polyimides. These properties of the aliphatic polyimides originate from the lack of intramolecular or intermolecular charge transfer (CT) interaction. However, aliphatic polyimides (APIs) have a few serious problems that they generally possess relatively low glass transition temperature (Tg) and mechanical properties, and very poor degree of polymerization leading to very low molecular weight. In this study, we prepared fully aliphatic polyimides from HPMDA and MCA using water-containing solvent mixture. The synthesized APIs showed much higher molecular weight than conventionally synthesized aliphatic polyimides using organic solvents.