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Pore-size distribution controls shape-memory properties on the macro- and microscale of polymeric foams

  • Open porous foams with identical foam density but different pore-size distributions (bimodal or monomodal) are prepared from a shape-memory polyetherurethane (PEU) by thermally induced phase separation. The shape-memory effect of the two PEU foams is explored by cyclic thermomechanical compression tests and microstructural analysis. The obtained results reveal that the PEU foam with a bimodal pore-size distribution exhibits an increased shape-recovery under stress-free conditions, both on the macro- (foam level) as well as the microscale (pore level). While bimodal pore-size distributions induce microscale bending during compression, buckling occurs in foams with monomodal pore-size distributions, leading to both a reduced and delayed shape recovery.

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Author:Tilman Sauter, Karl Kratz, Andreas LendleinORCiDGND
Parent Title (English):Macromolecular chemistry and physics
Place of publication:Weinheim
Document Type:Article
Year of first Publication:2013
Year of Completion:2013
Release Date:2017/03/26
Tag:microstructure; morphology; polymer foams; pore-size distribution; shape-memory polymers
First Page:1184
Last Page:1188
Funder:Berlin-Brandenburg School for Regenerative Therapies [DFG-GSC 203]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Biochemie und Biologie
Peer Review:Referiert