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000171841 1001_ $$0P:(DE-Juel1)157910$$aJaksch, Sebastian$$b0$$ufzj
000171841 245__ $$aThe collapse and aggregation of thermoresponsive poly(2-oxazoline) gradient copolymers: a time-resolved SANS study
000171841 260__ $$aBerlin$$bSpringer$$c2014
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000171841 520__ $$aWe have investigated the collapse transition of aqueous solutions of gradient copolymers from poly(iso-propyl-2-oxazoline)s (PiPrOx), which contain few hydrophobic moieties (n-nonyl-2-oxazoline (NOx) monomers). We extend our previous investigations (Salzinger et al., Colloid Polym Sci 290:385–400, 2012), where, for the gradient copolymers, an intermediate regime right above the cloud point was identified where small aggregates are predominant. Large aggregates are present in significant numbers only at higher temperatures. To investigate the stability of the intermediate regime, we performed time-resolved small-angle neutron scattering (SANS) experiments during temperature jumps starting below the cloud point and ending in the intermediate regime or in the high-temperature regime. We found that the intermediate regime is stable during the time investigated (∼1 h). Moreover, the collapse of the small aggregates and the surface structure of the large aggregates are related to the number of hydrophobic moieties and the quench depth. The present results elucidate the structural evolution of these polymers and relate them to their final state as well as to their macroscopic behavior.
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000171841 65017 $$0V:(DE-MLZ)GC-1602-2016$$2V:(DE-HGF)$$aPolymers, Soft Nano Particles and  Proteins$$x2
000171841 65017 $$0V:(DE-MLZ)GC-150-1$$2V:(DE-HGF)$$aKey Technologies$$x1
000171841 65017 $$0V:(DE-MLZ)GC-140$$2V:(DE-HGF)$$aSoft Matter, Macromolecules, Complex fluids, Biophysics$$x0
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000171841 7001_ $$0P:(DE-HGF)0$$aSchulz, Anita$$b1
000171841 7001_ $$0P:(DE-HGF)0$$aKyriakos, Konstantinos$$b2
000171841 7001_ $$0P:(DE-HGF)0$$aZhang, Jianqi$$b3
000171841 7001_ $$0P:(DE-HGF)0$$aGrillo, Isabelle$$b4
000171841 7001_ $$0P:(DE-Juel1)130893$$aPipich, Vitaliy$$b5$$ufzj
000171841 7001_ $$0P:(DE-HGF)0$$aJordan, Rainer$$b6
000171841 7001_ $$0P:(DE-HGF)0$$aPapadakis, Christine M.$$b7$$eCorresponding Author
000171841 773__ $$0PERI:(DE-600)1462029-7$$a10.1007/s00396-014-3333-6$$gVol. 292, no. 10, p. 2413 - 2425$$n10$$p2413 - 2425$$tColloid & polymer science$$v292$$x0023-2904$$y2014
000171841 8564_ $$uhttp://link.springer.com/article/10.1007%2Fs00396-014-3333-6
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