Abstract
Compatibility of poly(vinyl butyral) (PVB) to mixed organic solvents of xylene and isopropyl alcohol (IPA) was studied viscometrically in alumina slurry, and the influence on the structure of green sheets was examined by a confocal laser scanning microscopy. The PVB molecule had both butyral (hydrophobic) group and hydroxyl (hydrophilic) group. The various mixed solvents including xylene and IPA were prepared by changing the each concentration. The intrinsic viscosity of a PVB molecule in a mixed organic solvent was higher than that in the plain solvent. The homogeneous green sheets were obtained from their slurries with mixed solvents. The high intrinsic viscosity indicated the expanded conformation of the PVB molecule in the mixed solvents. The results showed that the expanded conformation of the PVB molecule in the solvents was effective for dispersion of alumina particles. The control of the compatibility of the PVB molecule and the mixed organic solvents was an important factor for fabricating the homogeneous green sheets.
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