通过溶液浇铸形成ABC三嵌段三元共聚物仍然具有挑战性。在这项研究中,我们使用聚(2,2,2-三氟乙基甲基丙烯酸酯)-b-聚(4-乙烯基吡啶)-b-聚苯乙烯(FPS)三嵌段三元共聚物通过溶液浇铸制造了核-壳双陀螺网络结构,N-二甲基甲酰胺(DMF)。热处理后,聚合物倾向于在F/S界面处形成球层结构。考虑到各组分在DMF中的溶解性,预期F相对于P的有效体积分数在浓缩溶液中会增加,而S的有效体积分数会降低。来自DMF溶液的微相分离结构一致导致形成由核壳双陀螺组成的网络结构,以F为矩阵,P作为外壳,以S为核心,随着PS嵌段的分子量增加到13.8、20.7和28.8kgmol-1,它们的周期长度逐渐增加到110.8、131.8和162.7nm。基于本研究中强调的聚合物组分的溶解度特性,溶剂选择策略广泛适用于具有各种聚合物组分的ABC三嵌段三元共聚物,为制造核壳双陀螺结构提供了更有效的途径。本文受版权保护。保留所有权利。
The formation of ABC triblock terpolymers through solution casting is still challenging. In this study, core-shell double gyroid network structures are fabricated via solution casting using poly(2,2,2-trifluoroethyl methacrylate) (PTFEMA) (F)-b-[poly(4-vinylpyridine) (P4VP) (P)]-b-[polystyrene (PS) (S)] (FPS) triblock terpolymers in N,N-
dimethylformamide (DMF). Upon heat treatment, the polymer tends to form a sphere-in-lamellar structure at the F/S interface. Given the solubility properties of each component in DMF, it is anticipated that the effective volume fraction of F relative to P would increase in concentrated solutions and the effective volume fraction of S would decrease. The microphase-separated structure derived from the DMF solution consistently results in the formation of a network structure composed of a core-shell double gyroid, with F as the matrix, P as the shell, and S as the core, and their periodic lengths gradually increase to 110.8, 131.8, and 162.7 nm as increase molecular weights of PS blocks to 13.8, 20.7, and 28.8 kg mol-1. Based on the solubility properties of the polymer components highlighted in this study, the solvent selection strategy is broadly applicable to ABC triblock terpolymers featuring various polymer components, offering a more efficient avenue for fabricating core-shell double gyroid structures.