讲座主题：Ionic Correlations in Polymer Nanostructures: From Block Copolymers to End-Charged Blends

报告人：王振纲（美国工程院院士、加州理工学院教授）

报告时间：2025年12月13日上午10：30-12：00

报告地点：广州国际校区C1-b115

邀请人：程正迪院士

邀请单位：前沿软物质学院

报告摘要：

Ionic interactions provide a powerful and tunable means to direct polymer phase behavior, with applications in solid-state batteries and polymer compatibilization. This talk explores two key systems—neutral-charged block copolymers and ion-functionalized polymer blends—using an electrostatic fluctuation-augmented self-consistent field theory.For AB block copolymers with partially charged A-blocks, we demonstrate that ion correlations induce a chimney-like phase diagram, but dielectric contrast between blocks weakens the chimney-like feature. As the A-block charge fraction increases, counterions shift from interfacial accumulation to more uniform distribution within the A-domain. Notably, smaller counterions promote localized ion distributions, leading to hierarchical nanostructures (e.g., alternating layers, concentric cylindrical shells, and spherical shells) in lamellar, cylindrical, and spherical phases, respectively. These findings are in general agreement with literature data on neutral–charged diblock copolymers and salt-dope diblock copolymers. In the second part, we examine polymer blends where each chain is end-functionalized with a single oppositely charged group. Strong ion correlations effectively link the polymers, inducing phase behavior resembling that of neutral block copolymers. However, the order-disorder transition occurs at a significantly lower critical χN than in neutral systems. Additionally, ion localization persists even in fully miscible blends. These findings highlight the critical role of ionic interactions in tailoring polymer self-assembly for advanced materials.

个人简介：

王振纲教授1982年毕业于北京大学化学系。1987年获芝加哥大学博士。之后分别在 ExxonMobil公司和加州大学洛杉矶分校做博士后研究。1991年受聘于美国加州理工学院化学与化工学部，现为Dick and Barbara Dickinson讲座教授。

王振纲教授是国际知名的高分子和软物质理论物理学家。主要研究领域涉及高分子溶液、混合物和共聚物的热力学与动力学；表面和界面；液晶态、胶体和凝胶；软物质体系的静电相互作用；DNA和RNA的生物物理和病毒自组装；生物膜物理等。2001年当选美国物理学会会士。2008年获美国加州理工学院最高教学奖Richard P. Feynman奖。2025年当选美国工程院院士。