Figure 1 (a-c) were incorrectly assigned in the caption. The correct legend should read: "a-c) Photographs of the cellulose hydrogels: (a) physically cross-linked cellulose hydrogel, (b) DC cellulose hydrogel, and (c) chemically cross-linked cellulose hydrogel under bending." A reflection peak was incorrectly assigned throughout the manuscript. All occurrences of (200) should be changed to (110). All reflections labeled initially (110) in the manuscript instead represent (110) In consequence two passages on page 6282 should read as follows: "…which correspond to the (110) and (110) reflections, respectively, of cellulose II crystallite. [26] Therefore, …resulted from the (110) reflection of the cellulose II crystallite hydrates…". and "…the intensity of the peak at 20.2° for the (110) reflection of the cellulose II crystallite hydrates gradually increased, …" in addition text on page 6283 should appear as "Moreover, the intensity of the (110) reflection of the DC cellulose hydrogels increased as the concentration of aqueous ethanol increased…" and the corrected version of Figure 3 should appear as shown below: correction Figure 3. X-ray diffraction profi les of the PC cellulose hydrogel, DC cellulose hydrogel, and CC cellulose hydrogel prepared using a) different ECH-to-AGU molar ratios and b) different concentrations of aqueous ethanol. The above errors do not affect the scientific conclusions drawn from the work. The authors apologize for any inconvenience or misunderstanding that these errors may have caused.

Electrostatic interaction is strong but usually diminishes in high ionic-strength environments. Biosystems can use this interaction through adjacent cationic–aromatic amino acids sequence of proteins even in a saline medium. Application of such specific sequence to the development of cationic polymer materials adhesive to negatively charged surfaces in saline environments is challenging due to the difficulty in controlling the copolymer sequences. Here, we discover that copolymers with adjacent cation–aromatic sequences can be synthesized through cation–π complex-aided free-radical polymerization. Sequence controlled hydrogels from diverse cation/aromatic monomers exhibit fast, strong but reversible adhesion to negatively charged surfaces in seawater. Aromatics on copolymers are found to enhance the electrostatic interactions of their adjacent cationic residues to the counter surfaces, even in a high ionic-strength medium that screens the electrostatic interaction for common polyelectrolytes. This work opens a pathway to develop adhesives using saline water.

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High-flexibility, high-toughness double-cross-linked (DC) chitin hydrogels are prepared through a sequential chemical and physical cross-linkings strategy. The incorporation of chemically and physically cross-linked domains imbues the DC chitin hydrogels with relatively high stiffness, high toughness, and toughness recoverability.

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