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Boba K, Bianchi M, McCombe G, et al. Blocked Shape Memory Effect in Negative Poisson's Ratio Polymer Metamaterials. ACS Appl Mater Interfaces. 2016;8(31):20319-28doi: 10.1021/acsami.6b02809.
Boba, K., Bianchi, M., McCombe, G., Gatt, R., Griffin, A. C., Richardson, R. M., Scarpa, F., Hamerton, I., & Grima, J. N. (2016). Blocked Shape Memory Effect in Negative Poisson's Ratio Polymer Metamaterials. ACS applied materials & interfaces, 8(31), 20319-28. https://doi.org/10.1021/acsami.6b02809
Boba, Katarzyna, et al. "Blocked Shape Memory Effect in Negative Poisson's Ratio Polymer Metamaterials." ACS applied materials & interfaces vol. 8,31 (2016): 20319-28. doi: https://doi.org/10.1021/acsami.6b02809
Boba K, Bianchi M, McCombe G, Gatt R, Griffin AC, Richardson RM, Scarpa F, Hamerton I, Grima JN. Blocked Shape Memory Effect in Negative Poisson's Ratio Polymer Metamaterials. ACS Appl Mater Interfaces. 2016 Aug 10;8(31):20319-28. doi: 10.1021/acsami.6b02809. Epub 2016 Jul 26. PMID: 27377708.
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ACS Appl Mater Interfaces. 2016 Aug 10;8(31):20319-28. doi: 10.1021/acsami.6b02809. Epub 2016 Jul 26.

Blocked Shape Memory Effect in Negative Poisson's Ratio Polymer Metamaterials.

ACS applied materials & interfaces

Katarzyna Boba, Matteo Bianchi, Greg McCombe, Ruben Gatt, Anselm C Griffin, Robert M Richardson, Fabrizio Scarpa, Ian Hamerton, Joseph N Grima

Affiliations

  1. Advanced Composites Centre for Innovation and Science (ACCIS), University of Bristol , BS8 1TR Bristol, United Kingdom.
  2. Metamaterials Unit, University of Malta , Msida MSD 2080, Malta.
  3. Materials Science and Engineering, Georgia Institute of Technology , 801 Ferst Drive North West, Atlanta, Georgia 30332-029, United States.
  4. H H Wills Physics Laboratory, University of Bristol , Tyndall Avenue, Bristol, BS8 1TS, United Kingdom.

PMID: 27377708 DOI: 10.1021/acsami.6b02809

Abstract

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.

Keywords: foam; metamaterial; negative Poisson’s ratio; polyurethane; shape memory

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