| 초록 |
Polyimide(PI) is used largely for microelectronics because of heat resistance, chemical stability, and superior electric properties. However it would be desirable to reduce the CTE(coefficient of themal expansion), amount of moisture absorption and dielectric constant, since those properties of PI are not sufficient for advanced electronics use. As montmorillonite(MMT) consists of stacked silicate sheet about 2000Å in length, 10Å in thickness. it has a low thermal expansion coefficient and a high gas and water barrier property (MMT is homogeneously exfoliated into PI matrix and oriented parallel to the film surface). Since the preparation and processing of most of PI/clay nanocomposites need high temperature, organic modifier of long carbon-chain alkyl ammonium salts are not suitable for PI/clay nanocomposites. In this study, we chose the thermally stable N-[4-(4-aminobenzyl )phenyl]-5-norbornene-2,3-dicarboximide) as an organic modifier for the Na+-MMT. The PI/clay nanocomposite film was characterized by UV spectrosocpy, XRD, RDA, and AFM. Gas permeability and water uptake properties of the PI/clay nanocomposites were also measured. |
