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Anisotropy Effects in the Shape‐Memory Performance of Polymer Foams
Author(s) -
Sauter Tilman,
Kratz Karl,
Madbouly Samy,
Klein Frank,
Heuchel Matthias,
Lendlein Andreas
Publication year - 2021
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.202000730
Subject(s) - materials science , anisotropy , composite material , microscale chemistry , isotropy , compression (physics) , scanning electron microscope , shape memory polymer , polymer , copolymer , supercritical carbon dioxide , supercritical fluid , optics , thermodynamics , physics , mathematics , mathematics education
Abstract Isotropic and anisotropic shape‐memory polymer foams are prepared by supercritical carbon dioxide foaming from a multiblock copolymer (PDLCL) consisting of poly(ω‐pentadecalactone) and poly(ε‐caprolactone) segments. Analysis by micro‐computed tomography reveals for the anisotropic PDLCL foam cells a high shape anisotropy ratio of R = 1.72 ± 0.62 with a corresponding Young's compression moduli ratio between longitudinal and transversal direction of 4.3. The experimental compression data in the linear elastic range can be well described by the anisotropic open foam model of Gibson and Ashby. A micro‐morphological analysis for single pores using scanning electron microscopy images permits the correlation between the macroscopic stress‐compression behavior and microscale structural changes.