Competition of Composition Fluctuation Modes in Weakly Segregated Salt-doped Symmetric Diblock Copolymers

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外文摘要：Salt-doped block copolymers have widespread applications in batteries,fuel cells,semiconductors,and various industries,where their properties crucially depend on phase separation behavior.Traditionally,investigations into salt-doped diblock copolymers have predominantly focused on microphase separation,overlooking the segregation between ionic and polymeric species.This study employs weak segregation the-ory to explore the interplay between phase separation dominated by the polymer-modulated mode and the salt-out-modulated mode,corre-sponding to microscopic and macroscopic phase separations,respectively.By comparing diblock copolymers doped with salts to those doped with neutral solvents,we elucidate the significant role of charged species in modulating phase behavior.The phase separation mode exhibits a transition between the polymer-modulated and salt-out-modulated modes at different wavenumbers.In systems doped with neutral solvents,this transition is stepwise,while in salt-ion-doped systems,it is continuous.With a sufficiently large Flory-Huggins parameter between ions and polymers,the salt-out-modulated mode becomes dominant,promoting macrophase separation.Due to the solvation effect of salt ions,salt-doped systems are more inclined to undergo microphase separation.Furthermore,we explore factors influencing the critical wavenumber of phase separation,including doping level and the Flory-Huggins parameters between two blocks and between ions and polymeric species.Our findings reveal that in a neutral solvent environment,these factors alter only the boundary between micro-and macro-phase separations,leav-ing the critical wavenumber unchanged in microphase separation cases.However,in a salt-doped environment,the critical wavenumber of mi-crophase separation varies with these parameters.This provides valuable insights into the pivotal role of electrostatics in the phase separation of salt-doped block copolymers.

外文关键词：

Block copolymerPhase separationField theorySalt-doped

作者：

Yuan-Xin Zhou、Xian Kong

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作者单位：

South China Advanced Institute for Soft Matter Science and Technology,School of Emergent Soft Matter,South China University of Technology,Guangzhou 510640,China

Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices,South China University of Technology,Guangzhou 510640,China

基金：

Major Research Plan of the National Natural Science Foundation of ChinaGuangdong Basic and Applied Basic Research FoundationRecruitment Program of GuangdongTCL Science and Technology Innovation Fund

项目编号：

923721042022A15151100162016ZT06C322

出版年：

2024

DOI：

10.1007/s10118-024-3145-1

高分子科学(英文版)

中国化学会　中国科学院化学研究所

高分子科学(英文版)

CSTPCD

影响因子：0.721

ISSN：0256-7679

年,卷(期)：2024.42(9)