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000824279 1001_ $$0P:(DE-Juel1)141611$$aZinn, Thomas$$b0
000824279 245__ $$aMolecular Exchange Kinetics of Micelles: Corona Chain Length Dependence
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000824279 520__ $$aThe rate of molecular exchange in diblock copolymer micelles is strongly dependent on the chain length of the core-forming insoluble block. Less is known about the influence of the soluble block forming the micellar corona. In this study we present a time-resolved small angle neutron scattering (TR-SANS) study exploring systematically the effect of corona chain length on the dynamics of chain exchange. As a model system we have taken amphiphilic AB diblock copolymers of the type C27H55-poly(ethylene oxide)x (C27–PEOx) with varying x between 4 and 36 kg/mol in aqueous solution in which well-defined spherical micelles with partially crystalline cores are formed. The TR-SANS results show that the chain exchange slows down considerably upon increasing PEO molecular weight, while the characteristic “attempt time” constant, τ0, was found to increase with a power law dependence τ0 ∼ MPEO9/5. The results are in excellent agreement with the Halperin and Alexander model1 and can be attributed to a reduced diffusion rate through the micellar corona. Our results clearly demonstrate that the rate for molecular exchange is not directly coupled to the solubility of the amphiphile and the critical micellar concentration, as has previously been indicated.
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000824279 65017 $$0V:(DE-MLZ)GC-1602-2016$$2V:(DE-HGF)$$aPolymers, Soft Nano Particles and  Proteins$$x0
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000824279 7001_ $$0P:(DE-Juel1)131036$$aWillner, Lutz$$b1$$ufzj
000824279 7001_ $$0P:(DE-Juel1)130893$$aPipich, Vitaliy$$b2$$ufzj
000824279 7001_ $$0P:(DE-Juel1)130917$$aRichter, Dieter$$b3$$ufzj
000824279 7001_ $$0P:(DE-HGF)0$$aLund, Reidar$$b4$$eCorresponding author
000824279 773__ $$0PERI:(DE-600)2644375-2$$a10.1021/acsmacrolett.6b00395$$gVol. 5, no. 7, p. 884 - 888$$n7$$p884 - 888$$tACS Macro Letters$$v5$$x2161-1653$$y2016
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