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Neutron Spin-echo investigation of the dynamics of block copolymer micelles

机译:中子自旋回波研究嵌段共聚物胶束的动力学

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摘要

The dynamics of E+92B_18(E=OCH_2CH_2:oxyethylene,B=OCH_2CH(C_2H_5):oxybutylene;the subscripts are the number of repeats)block copolymer micelles is investigated by neutron spin-echo(NSE).The dynamics of chains in E_92B_18 micelles is investigated in the hard gel and soft gel phases of the E_92B_18 in D_2O,as well as in the micellar solution.NSE revealed the presence of two dynamic modes,i.e.,"fast" and "slow"modes,which are observed independent of the phase,i.e.,micellar liquid,soft gel or hard gel.A"slow'mode that dominates at low scattering angles corresponds to the translational diffusion of micelles,the micellar size R_s being in good agreement with the apparent hydrodynamic radius form dynamic light scattering experiments on a dilute solution.An additional "fast" mode was observed,and ascribed,and ascribed to internal "blob scattering"in the micellar corona.
机译:利用中子自旋回波(NSE)研究了E + 92B_18(E = OCH_2CH_2:氧乙烯,B = OCH_2CH(C_2H_5):氧丁烯;下标为重复数)的动力学.E_92B_18中链的动力学在D_2O中的E_92B_18的硬凝胶和软凝胶相以及胶束溶液中研究了胶束。NSE揭示了存在两种动态模式,即“快速”和“慢速”模式,独立于相,即胶束状液体,软凝胶或硬凝胶。在低散射角占优势的“慢”模式对应于胶束的平移扩散,胶束大小R_s与动态光散射形成的表观流体动力学半径高度吻合在稀溶液上进行了实验。观察到并归因于胶束电晕中的内部“斑点散射”,并归因于另一种“快速”模式。

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