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Strain hardening nanocomposites.

U.S. Patent 9,358,730 (June 7, 2016), "Dynamic Strain Hardening in Polymer Nanocomposites," Pulickel M. Ajayan and Brent Joseph Carey (William Marsh Rice University, Houston, Texas, USA).

Polymeric nanocomposites often lack stiffness or strength which cannot be easily enhanced. Ajayan and Carey enhanced stiffness by 50 to 30% with a dynamic stress. These composites consist of a polymer matrix and nanofillers with an interphase between matrix and fillers. Stiffness and strength of the composite can be increased permanently in response to the applied stress. It also increases the storage modulus, decreases the loss modulus and loss tangent. In these cases, the applied stress rearranges the interphase. This stress can be mechanical dynamic, static or cyclical stress. The nanofillers include carbon nanotubes, graphite, carbon black, nanofibers and nanoparticles. The polymers range from polyethylene to polyimides, as well as elastomers.

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Author:Corneliussen, Roger
Publication:Plastics Engineering
Article Type:Brief article
Geographic Code:1USA
Date:Sep 1, 2016
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