Here, we propose a solvent-mediated molecular engineering strategy to fabricate high-performance bamboo molecular plastics (BM-plastics) with tunable H-bond networks. By employing a hydrated ZnCl₂/formic acid deep eutectic solvent (DES), we disassemble the native H-bond matrix of bamboo cellulose into a homogeneous molecular system. Subsequent ethanol stimulation triggers the rearrangement of cellulose chains, fostering dense, ordered H-bond interactions between hydroxyl and formate ester groups (Fig. 1b). This dual-step process not only overcomes the trade-off between mechanical strength and processability (Fig. 1c) but also enables scalable manufacturing under ambient conditions (Fig. 1d). In contrast to traditional processing methods that often require toxic or costly reagents and are associated with high energy consumption, our solvent-mediated molecular engineering approach delivers substantial operational advantages while significantly improving the performance characteristics of the resulting BM-plastic
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