When the size of talc powder reduced from several micrometers to about 120 nm, its surface property switched from hydrophobic to hydrophilic. The characterization of those magnesium silicate nano-plate mineral crystals will be discussed first.  A model described the nanosize talc is then proposed, as well as the mechanism of its surface physical property switching. This unique property has led to many novel applications, especially in the field of engineering-plastics/coatings. It is an inorganic-organic nanocomposite at the molecular-level. The platy magnesium silicate nano inorganic crystal is, in some cases, chemically bonding to the organic polymer.  As a result, the polymer composite formed is clear and colorless at up to 20% loading with excellent gloss. It also improved barrier properties of any gaseous. Glass-transition temperature (TG) will increase and the composites exhibited ~ 100 degrees improvement in thermal stability. Especially, it enhanced the overall physical properties of engineering plastics and coating.

Characterization and application of nano size talc

244th National Meeting (2012)

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