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000015283 0247_ $$2DOI$$a10.1007/s00396-011-2382-3
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000015283 084__ $$2WoS$$aChemistry, Physical
000015283 084__ $$2WoS$$aPolymer Science
000015283 1001_ $$0P:(DE-HGF)0$$aAdelsberger, J.$$b0
000015283 245__ $$aThe collapse transition and the segmental dynamics in concentrated micellar solutions of P(S-b-NIPAM) diblock copolymers
000015283 260__ $$aBerlin$$bSpringer$$c2011
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000015283 440_0 $$01358$$aColloid and Polymer Science$$v289$$x0303-402x$$y5
000015283 500__ $$aWe kindly acknowledge the given beam time by the Julich Centre for Neutron Science at FRM II. This work was supported by the DFG priority program SPP1259 "Intelligente Hydrogele" (Pa771/4, Mu1487/8, La611/7, He2995/2). A.M. Bivigou-Koumba gratefully acknowledges a personal grant from Deutscher Akademischer Austauschdienst (DAAD).
000015283 520__ $$aWe investigate concentrated solutions of poly(styrene-b-N-isopropyl acrylamide) (P(S-b-NIPAM)) diblock copolymers in deuterated water (D2O). Both structural changes and the changes of the segmental dynamics occurring upon heating through the lower critical solution temperature (LCST) of PNIPAM are studied using small-angle neutron scattering and neutron spin-echo spectroscopy. The collapse of the micellar shell and the cluster formation of collapsed micelles at the LCST as well as an increase of the segmental diffusion coefficient after crossing the LCST are detected. Comparing to our recent results on a triblock copolymer P(S-b-NIPAM-b-S) [25], we observe that the collapse transition of P(S-b-NIPAM) is more complex and that the PNIPAM segmental dynamics are faster than in P(S-b-NIPAM-b-S).
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000015283 65320 $$2Author$$aBlock copolymers
000015283 65320 $$2Author$$aResponsive polymers
000015283 65320 $$2Author$$aSmall-angle neutron scattering
000015283 65320 $$2Author$$aNeutron spin-echo spectroscopy
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000015283 7001_ $$0P:(DE-HGF)0$$aMeier-Koll, A.$$b1
000015283 7001_ $$0P:(DE-HGF)0$$aBivigou-Koumba, A.M.$$b2
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