Anisotropic polyurethane foam with Poisson's ratio greater than 1

Taeyong Lee, R. S. Lakes

Research output: Contribution to journalArticlepeer-review

62 Scopus citations


Anisotropic polymer foams have been prepared, which exhibit a Poisson's ratio exceeding 1, and ratios of longitudinal to transverse stiffness exceeding 50. The foams are as much as 20 times stiffer in the longitudinal direction than the foams from which they were derived. The transformation process involved applying to open-cell polyurethane foam an axial strain of 25 to 45%, at a temperature above the softening point, followed by cooling under axial strain.

Original languageEnglish
Pages (from-to)2397-2401
Number of pages5
JournalJournal of Materials Science
Issue number9
StatePublished - 1997

Bibliographical note

Funding Information:
Support of this research by the Boeing ACTAS program is gratefully acknowledged.


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