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. Author manuscript; available in PMC: 2022 Jun 22.
Published in final edited form as: Chem Rev. 2021 Apr 12;121(8):4309–4372. doi: 10.1021/acs.chemrev.0c01088

Figure 4.

Figure 4.

Chemical structures and schematics of typical examples of a. common natural polymers, b. common synthetic polymers, and c. permanent covalent crosslinks for hydrogels. R represents an organyl substituent or hydrogen.