TY  - JOUR
A1  - Sauter, Tilman
A1  - Kratz, Karl
A1  - Lendlein, Andreas
T1  - Pore-size distribution controls shape-memory properties on the macro- and microscale of polymeric foams
JF  - Macromolecular chemistry and physics
N2  - 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.
KW  - microstructure
KW  - morphology
KW  - polymer foams
KW  - pore-size distribution
KW  - shape-memory polymers
Y1  - 2013
U6  - https://doi.org/10.1002/macp.201300062
SN  - 1022-1352
VL  - 214
IS  - 11
SP  - 1184
EP  - 1188
PB  - Wiley-VCH
CY  - Weinheim
ER  -