Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 S8-36 Ookayama, Meguro-ku, Tokyo, 152-8552, Japan.
School of Chemistry and Chemical Engineering, Jiangxi University of Science and Technology, Rare Earth Building B512, No.156 Kejia Avenue, Ganzhou City, Jiangxi Province, 341000, China.
Macromol Rapid Commun. 2024 Jul;45(14):e2400093. doi: 10.1002/marc.202400093. Epub 2024 Apr 29.
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. 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.
通过溶液浇铸制备 ABC 三嵌段共聚物仍然具有挑战性。在这项研究中，通过溶液浇铸使用聚（2,2,2-三氟乙基甲基丙烯酸酯）（PTFEMA）（F）-b-[聚（4-乙烯基吡啶）（P4VP）（P）]-b-[聚苯乙烯（PS）（S）]（FPS）三嵌段共聚物在 N,N-二甲基甲酰胺（DMF）中制备核壳双回旋体网络结构。热处理后，聚合物倾向于在 F/S 界面处形成球层状结构。考虑到每种成分在 DMF 中的溶解度特性，预计 F 相对于 P 的有效体积分数会在浓溶液中增加，而 S 的有效体积分数会减少。源自 DMF 溶液的微相分离结构始终导致由核壳双回旋体组成的网络结构的形成，其中 F 为基体，P 为壳，S 为核，并且它们的周期长度逐渐增加到 110.8、131.8 和 162.7nm，因为 PS 块的分子量增加到 13.8、20.7 和 28.8kgmol。基于本研究中突出的聚合物成分的溶解度特性，溶剂选择策略广泛适用于具有各种聚合物成分的 ABC 三嵌段共聚物，为制备核壳双回旋体结构提供了更有效的途径。
