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@ARTICLE{Burckbuchler:57471,
author = {Burckbuchler, V. and Kjoeniksen, A.-L. and Galant, C. and
Lund, R. and Amiel, C. and Knudsen, K. D. and Nyström, B.},
title = {{R}heological and structural characterization of the
interactions between cyclodextrin compounds and
hydrophobically modified alginate},
journal = {Biomacromolecules},
volume = {7},
issn = {1525-7797},
address = {Columbus, Ohio},
publisher = {American Chemical Soc.},
reportid = {PreJuSER-57471},
pages = {1871 - 1878},
year = {2006},
note = {Record converted from VDB: 12.11.2012},
abstract = {Interactions in semidilute solutions of a hydrophobically
modified alginate (HM-alginate) in the presence of
hydroxypropyl-beta-cyclodextrin (HP-beta-CD) monomer or
beta-cyclodextrin polymer (poly(beta-CD)) have been
characterized at different temperatures with the aid of
rheology and small-angle neutron scattering ( SANS). The
viscosity results for the HM-alginate/HP-beta-CD system
reveal progressive deactivation of the hydrophobic
associations as the concentration of HP-beta-CD increases.
For the HM-alginate/poly(beta-CD) system, on the other hand,
addition of poly(beta-CD) sets up bridges between adjacent
polymer chains and thereby strengthens the associative
network. A novel shear-thickening effect is observed at
fairly high shear rates for the HM-alginate/ poly(beta-CD)
system, and this feature is influenced by temperature.
Elevated temperature induces higher chain mobility and the
formation of weaker network associations. Analyses of the
SANS data disclosed that the association strength in
HM-alginate/poly(beta-CD) mixtures increases strongly with
increasing cosolute concentration, whereas no effect or a
moderate weakening of the strength can be traced in
HM-alginate/HP-beta-CD solutions upon addition of
HP-beta-CD. The value of the correlation length xi is
virtually not affected by the addition of cosolute for the
HM-alginate/poly(beta-CD) system, whereas the decoupling of
hydrophobic moieties of the polymer upon addition of
HP-beta-CD gives rise to a smaller value of xi, suggesting
that the size of the heterogeneity patches is reduced. The
SANS results suggest that compact association structures are
formed in the HM-alginate/poly(beta-CD) solutions.},
keywords = {J (WoSType)},
cin = {IFF-INS},
ddc = {540},
cid = {I:(DE-Juel1)VDB341},
pnm = {Kondensierte Materie / Großgeräte für die Forschung mit
Photonen, Neutronen und Ionen (PNI)},
pid = {G:(DE-Juel1)FUEK414 / G:(DE-Juel1)FUEK415},
shelfmark = {Biochemistry $\&$ Molecular Biology / Chemistry, Organic /
Polymer Science},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000238180600026},
doi = {10.1021/bm060149o},
url = {https://juser.fz-juelich.de/record/57471},
}