Gd3+ ionic nano-aggregate clusters enable metallopolymers redox electrolytes as high-performance flexible radiation shielding. (5th January 2023)

• Record Type: Journal Article
• Authors: Wu, Jin-Ke; Zhang, Wei-Wei; Wang, Jian-Jun; Zhu, Jiang-Tao; Zhang, Yu-Hang; Li, Yi-Xuan; Luo, Ya-Jun; Zhang, Ya-Fei; Dai, Li-Xing; Qin, Chuan-Xiang; Sun, Jun; Chen, Jia-Jia
• Is Part Of: Composites science and technology. Volume 231(2023)
• Publication Date: 2023-01-05
• Subjects: Metallopolymers -- Ionic aggregate clusters -- Ferrocene redox centers -- Radiation shielding; Composite materials -- Periodicals; Composite materials; Fibrous composites; Periodicals; 620.118
• DOI: 10.1016/j.compscitech.2022.109817
• Languages: English
• ISSNs: 0266-3538

Abstract

Abstract: In this work, Gd 3+ ionic nano-aggregate clusters were introduced into metallo-polyelectrolytes to balance the conflicts between high mechanical robustness and X-ray attenuation of flexible shielding materials. The segmented polyurethanes (PUs) containing main-chain bisferrocene and pendant sulfonates in hard segments is applied as a macromolecular template for the subsequent self-assembly with Gd 3+ . Rare earths aggregate into dynamic clusters about 2.2 nm, which is beneficial to improve the radiation attenuation ability and mechanical properties of materials. The hierarchical noncovalent interactions (ionic interactions, coordination interactions, hydrogen bonds, and ferrocene-metal interactions, etc.) in the aggregate PUs enable the co-existence of high mechanical strength, large stretchability, and fast radiation dissipation. As a result, this Gd 3+ hybrid bisferrocene-based PU demonstrates extremely high tensile properties (breaking stress = 27.8 ± 0.2 MPa, breaking strain = 576 ± 7%) as well as super atomic shielding efficiency (14.39 cm 2 g −1 ) at 65 keV. Graphical abstract: Image 1 Highlights: Novel Gd 3+ ionic clusters hybrid bisferrocene-based PUs were prepared. Bisferrocene regulates rare earth ions aggregation to clusters ≈2.2 nm. Bisferrocene endows hybrid polyurethanes with excellent mechanical properties. Synergistic effect of ferrocene to enhance the X-ray shielding ability of Gd 3+ is revealed. This flexible hybrid polyurethane meet the next-generation shielding materials.