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Auxetic foams.

US Patent 8,277,719 (October 2, 2012), "Process for the Preparation of Auxetic Foams," Andrew Alderson, Kim Lesley Alderson, Philip John Davies, and Gillian Mary Smart (Auxetic Technologies Ltd., Great Britain).

Auxetics are materials with a negative Poisson's ratio. That means, when stretched, they become thicker perpendicular to the applied force. This occurs due to hinge-like structures which flex when stretched. Such materials are expected to have high energy absorption and fracture resistance. Auxetics are useful as body armor, packing material, knee and elbow pads, shock absorbers and sponge mops. Alderson et al prepared thermoplastic auxetic foams from conventional thermoplastic foams by complex biaxial compression, heating and cooling stages.

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Title Annotation:INDUSTRY PATENTS; patent services
Author:Corneliussen, Roger
Publication:Plastics Engineering
Article Type:Brief article
Geographic Code:4EUUK
Date:Feb 1, 2013
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