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  - 
TY  - JOUR
A1  - Gardiner, Lauren M.
A1  - Kocyan, Alexander
A1  - Motes, Martin
A1  - Roberts, David L.
A1  - Emerson, Brent C.
T1  - Molecular phylogenetics of Vanda and related genera (Orchidaceae)
JF  - Botanical journal of the Linnean Society
N2  - The genus Vanda and its affiliated taxa are a diverse group of horticulturally important species of orchids occurring mainly in South-East Asia, for which generic limits are poorly defined. Here, we present a molecular study using sequence data from three plastid DNA regions. It is shown that Vanda s.l. forms a clade containing approximately 73 species, including the previously accepted genera Ascocentrum, Euanthe, Christensonia, Neofinetia and Trudelia, and the species Aerides flabellata. Resolution of the phylogenetic relationships of species in Vanda s.l. is relatively poor, but existing morphological classifications for Vanda are incongruent with the results produced. Some novel species relationships are revealed, and a new morphological sectional classification is proposed based on support for these groupings and corresponding morphological characters shared by taxa and their geographical distributions. The putative occurrence of multiple pollination syndromes in this group of taxa, combined with complex biogeographical history of the South-East Asian region, is discussed in the context of these results.(c) 2013 The Linnean Society of London, Botanical Journal of the Linnean Society, 2013, 173, 549-572.
KW  - Aeridinae
KW  - Ascocentrum
KW  - classification
KW  - Euanthe
KW  - matK
KW  - morphology
KW  - Neofinetia
KW  - psbA-trnH
KW  - trnL
KW  - trnL-F
Y1  - 2013
U6  - https://doi.org/10.1111/boj.12102
SN  - 0024-4074
SN  - 1095-8339
VL  - 173
IS  - 4
SP  - 549
EP  - 572
PB  - Wiley-Blackwell
CY  - Hoboken
ER  -