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000201063 1001_ $$0P:(DE-HGF)0$$aSalzinger, Stephan$$b0
000201063 245__ $$aAggregation behavior of thermo-responsive poly(2-oxazoline)s at the cloud point investigated by FCS and SANS
000201063 260__ $$aBerlin$$bSpringer$$c2012
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000201063 520__ $$aWe have studied different thermo-responsive poly(2-oxazoline)s with iso-propyl (iPrOx) and n-propyl (nPrOx) pendant groups in aqueous solutions, where they exhibit lower critical solution temperature behavior. This paper focuses on the effect of the degree of polymerization, n, the concentration, c, in the dilute regime, and the presence of hydrophobic moieties. The cloud points were investigated as a function of the degree of polymerization, n, and of the polymer concentration, c. The aggregation behavior near the cloud point was studied by temperature-resolved small-angle neutron scattering and fluorescence correlation spectroscopy, i.e., a combination of ensemble and single molecule methods. We found that at the cloud points, large aggregates are formed and that the cloud points depend strongly on both, n and c. Diblock copolymers from iPrOx and nPrOx form large aggregates already at the cloud point of PnPrOx, and, unexpectedly, no micelles are observed between the cloud points of the two blocks. Gradient copolymers from iPrOx and n-nonyl-2-oxazoline (NOx) display a complex aggregation behavior resulting from the interplay between intra- and intermolecular association mediated by the hydrophobic NOx blocks. Above the cloud point, an intermediate temperature regime with a width of a few Kelvin was found with small but stable polymer aggregates. Only at higher temperatures, larger aggregates are found in significant number.
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000201063 65017 $$0V:(DE-MLZ)GC-1602-2016$$2V:(DE-HGF)$$aPolymers, Soft Nano Particles and  Proteins$$x2
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000201063 7001_ $$0P:(DE-HGF)0$$aHuber, Stephan$$b1
000201063 7001_ $$0P:(DE-Juel1)157910$$aJaksch, Sebastian$$b2$$eCorresponding Author
000201063 7001_ $$0P:(DE-HGF)0$$aBusch, Peter$$b3
000201063 7001_ $$0P:(DE-HGF)0$$aJordan, Rainer$$b4
000201063 7001_ $$0P:(DE-HGF)0$$aPapadakis, Christine M.$$b5
000201063 773__ $$0PERI:(DE-600)1462029-7$$a10.1007/s00396-011-2564-z$$gVol. 290, no. 5, p. 385 - 400$$n5$$p385 - 400$$tColloid & polymer science$$v290$$x1435-1536$$y2012
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