In-Situ Reactions
In-situ reactions can be used to produce fine or nanoparticles dispersed in plastics. Polymers and inorganic substances, especially metals, are incompatible making homogeneous mixing difficult. Matsumoto and Toru have developed a dispersion technique based on intercalating alkali metal ions between layers of a lamellar crystalline polymer. The alkali metal ions are, then, exchanged with noble metal ions and the metal ions reduced. The polymer preferably contains diene and carboxyl groups as in polymuconic acid or polysorbic acid. The metal compound is preferably a metal hydroxide. The metal ions are reduced to metal particles with reducing agent such as hydrazine or alkylborane. The reduction can be triggered by radiation, heat, electricity or ultrasonics. The final metal particles may be gold, ruthenium, rhodium, palladium, osmium, iridium, platinum, nickel, copper or zinc. These particles can serve as biocides, fungicides or catalysts. (RDC 3/5/2010) (Akikazu and Odani, US Patent 7,645,811, 1/12/2010)
Recent US Patents
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Review Articles
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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.