Film with Oriented Particles
Anisotropic Fillers Perpendicular to Film Surface: In films, containing anisotropic particles formed by solvent casting or extrusion and biaxial orientation, the anisotropic particles are preferentially oriented parallel to the plane of the film. It is very difficult to prepare a film with the anisotropic particles perpendicular to the plane of the film. Massa, Blanton and Majumdar have developed a method for perpendicular oriented particles based on freeze drying. The anisotropic materials most suitable for this invention are plates with high aspect ratios. Plate-like clay particles are dispersed in water or organic solvent. The dispersing polymer may be any polymer but the preferred polymer is one that can be dissolved in the solvent and freeze dried. Poly(ethylene terephthalate) is most preferred because of its excellent mechanical strength, processability and effectiveness. The clay particles, other additives and resins are dispersed in the solvent and cast on a solid substrate. This resulting layer is freeze dried and removed. The clay platy particles end up oriented perpendicular to the substrate in the polymer matrix. (RDC 6/7/2009) (U.S. Patent 7,494,704, February 24, 2009, Dennis J. Massa, Thomas N. Blanton and Debasis Majumdar Eastman Kodak Company, Rochester, New York)
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Editor's Notes
As the literature is reviewed, and items of interest concerning this topic are found. These may be added in an abbreviated form with the reference. Readers and contributors are invited to add their own notes. Contributors may add them directly and other readers can simply send their notes to the editor, Roger Corneliussen at rcorneliussen@4spe.org. He may edit and add them to this page at his discretion.