Liya Chen, Zhewen Guo, Ding Xiao, Yikuan Liu, Tianyu Shan, Xue Yang, Zhenguo Zhang, Dingyue Hu, Xiaohe Miao, Shuai Liu, Qiaoshi Zeng, Xuedong Xiao, Mengbin Wang, Yihan Zhu, Guangfeng Li, Feihe Huang
The emergence of molecular weaving provides a bottom-up strategy for topological control of material properties. However, current molecularly woven polymer networks are fundamentally limited by their single-level woven structures, containing only one type of woven topology. Here we present a two-dimensional, multilevel woven polymer network that incorporates multiple woven topologies, similar to the structure of macroscale complex fabrics. Single-crystal X-ray analysis and integrated low-dose and cryogenic electron microscopy imaging confirm the presence of a multilevel woven structure. In situ pressure-dependent Raman spectroscopy combined with theoretical calculations reveals a hierarchical stress-regulation mechanism in the multilevel woven polymer network distinct from that of its single-level counterpart. Breakthrough experiments simulating industrial separation processes further demonstrate that the synergistic channels generated by the multilevel woven topology provide distinct advantages for precise toluene/methylcyclohexane separation. Hence, the transition from single-level to multilevel woven topologies is not merely a structural upgrade, but introduces unique properties and functions that lie beyond the reach of single-level systems.