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. Author manuscript; available in PMC: 2015 Mar 5.
Published in final edited form as: J Appl Polym Sci. 2014 Mar 5;131(5):10.1002/app.39822. doi: 10.1002/app.39822

FIGURE 4.

FIGURE 4

Preparation of six-membered cyclic carbonate monomers from (a) 2,2-bis(hydroxymethyl)propionic acid (Bis-MPA); (b) glycerol or trimethylolalkane; (c) pentaerythritol; and (d) representative chemical structures of functional cyclic carbonate monomers (1–18) and APCs-based macromers (19–25) used in the preparation of hydrogels and drug delivery carriers.