We describe a new class of negative Poisson's ratio (NPR) open cell PU-PE foams produced by blocking the shape memory effect in the polymer. Contrary to classical NPR open cell thermoset and thermoplastic foams that return to their auxetic phase after reheating (and therefore limit their use in technological applications), this new class of cellular solids has a permanent negative Poisson's ratio behavior, generated through multiple shape memory (mSM) treatments that lead to a fixity of the topology of the cell foam. The mSM-NPR foams have Poisson's ratio values similar to the auxetic foams prior their return to the conventional phase, but compressive stress-strain curves similar to the ones of conventional foams. The results show that by manipulating the shape memory effect in polymer microstructures it is possible to obtain new classes of materials with unusual deformation mechanisms.
|Number of pages||10|
|Journal||ACS Applied Materials and Interfaces|
|Early online date||26 Jul 2016|
|Publication status||Published - 10 Aug 2016|
- negative Poisson's ratio
- shape memory
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Professor Fabrizio Scarpa
- Department of Aerospace Engineering - Professor of Smart Materials & Structures
- Cabot Institute for the Environment
- The Bristol Centre for Nanoscience and Quantum Information
- Composites University Technology Centre (UTC)
- Bristol Composites Institute (ACCIS)
Person: Academic , Member