首页|Self-assembly Induced by Complexation of Diblock Copolyelectrolytes and Oppositely Charged Homopolymers
Self-assembly Induced by Complexation of Diblock Copolyelectrolytes and Oppositely Charged Homopolymers
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We investigate the solution self-assembly of a mixture of positively charged homopolymers and AB diblock copolymers,in which the A blocks are negatively charged,and the B blocks are neutral.The electrostatic complexation between oppositely charged polymers drives the for-mation of many ordered phases.The microstructures and phase diagrams are calculated using self-consistent field theory(SCFT)based on an ion-pair model with an equilibrium constant K to characterize the strength of binding between positively and negatively charged monomers.The ef-fects of the charge ratio,representing the ratio of charges from the homopolymer over all charges from polymers in the system,on the ordered structure are systematically studied,both for hydrophobic and hydrophilic A blocks.The charge ratio plays an important role in determining the phase boundaries in the phase diagram of salt concentration versus polymer concentration.We also provide information about the varying ten-dency of the domain spacing and core size of the spherical phase when the charge ratio is changed,and the results are in good agreement with experiments.These studies provide a deep understanding of the self-assembled microstructures of oppositely charged diblock copolymer-homopolymer systems.
Self-assemblyPolyelectrolyte complexationSelf-consistent field theoryIon-pair
Ling Zhao、Zhi-Yuan Yin、Jia-Di Jiang、Er-Qiang Chen、Shuang Yang
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Beijing National Laboratory for Molecular Sciences,Key Laboratory of Polymer Chemistry and Physics of Ministry of Education,Center for Soft Mater Science and Engineering,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China
Beijing National Laboratory for Molecular Sciences,College of Chemistry and Molecular Engineering,Peking University,Beijing,100871,China
National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)
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