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When the stem cell is in the process of transforming into a particular type of cell, its nucleus takes on an auxetic property, allowing it to `sponge up' essential materials from its surrounding," said Kevin Chalut from Stem Cell Institute, University of Cambridge.
Alderson et al prepared thermoplastic auxetic foams from conventional thermoplastic foams by complex biaxial compression, heating and cooling stages.
As a result of possessing a negative Poisson's ratio, certain properties are predicted from classical elasticity theory to be enhanced in auxetic materials (18).
However, even the production of films and fibers is still limiting the potential use of auxetic polymers, as their shape is decided by the extrusion die.
While almost all known materials expand laterally when stretched, auxetic materials are those that contract laterally when stretched.
Auxetic materials have a negative Poisson's ratio, meaning that under tensile stress, the area perpendicular to the tensile axis increases rather than decreases.
Auxetic behavior in microporous polymers was first observed in a particular form of polytetrafluoroethylene (PTFE) [18, 19].
More recently, research has concentrated on the production of a more useful form of auxetic microporous polymer, namely auxetic fibers , which could lead to more application-based research.
Auxetic materials laterally expand under uniaxial tension or laterally shrink under uniaxial compression.
Synthetic auxetic materials have been fabricated since 1987  when Lakes produced a polymeric foam with a negative Poisson's ratio, [nu].
Development of auxetic microporous polymers began with the examination and characterization of a microporous form of polytetrafluoroethylene (PTFE) [6, 7].
Recent publications have detailed how auxetic (negative Poisson's ratio) polymers have been fabricated by a novel thermal processing route consisting of three well-defined stages--compaction, sintering and extrusion.
Other Prominent Vendors in the market are: Caps Cases, Creative Corrugated Designs, ETT Verpackungstechnik, i2i Europe, Industrial Packaging, Linpac Packaging, Mayr-Melnhof Karton, Model Management, Polymer Logistics, RFC Container Company and Robert Bosch, Adidas, Auxetic, Clothing+, Eleksen, Exmovere Holdings, Exo2, Fibretronic, Gentherm, Globe Manufacturing, Interactive Wear, International Fashion Machines, Kimberly-Clark Health Care, Koninklijke Ten Cate nv, Marktek, Mide Technology, Milliken, Nike, Noble Biomaterials, Outlast Technologies, Peratech, Performance Fibers, Philips, QinetiQ North America, Schoeller Textil, Sensium Healthcare, Smartex s.
A highly fibrillar auxetic form of ultra-high molecular weight polyethylene (UHMWPE) has been fabricated by using a powder processing route comprising two stages--sintering and extrusion.
Subsequently, the range of synthetic materials capable of existing in auxetic forms has included polymer gels (2), molecular structures (3), and microporous polymers (4-6).
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