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On the effect of heat and solvent exposure on the microstructure properties of auxetic foams: A preliminary study
Author(s) -
Gatt Ruben,
Attard Daphne,
Manicaro Elaine,
Chetcuti Elaine,
Grima Joseph N.
Publication year - 2011
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201083978
Subject(s) - auxetics , microstructure , materials science , composite material , solvent , volume (thermodynamics) , polyurethane , thermodynamics , chemistry , physics , organic chemistry
Abstract The effect of elevated temperature and solvent exposure on the microstructure of auxetic polyurethane foams is investigated. It is shown that such effects result in an expansion of the auxetic foams accompanied by the removal of the highly convoluted features in the microstructure of auxetic foams with the result that such foams lose their auxetic characteristics. It is also shown that such changes do not occur if the foams are subjected to the high temperature or solvent exposure in a contained state which does not permit the expansion. This means that auxetic foams can still be used in such environments provided that the right precautions are taken (e.g. putting them in a cover thereby constraining them to retain their volume).