“…Figure 5.2 depicts some of these, including 2,5-furancarboxydialdehyde (FCDA), 2,5-furandicarboxylic acid (FDCA), 2,5-furandicarboxylic acid dichloride (FDCC), and isopropylidene bis-(2,5-furandiylmethylene)diisocyanate. Furan derivatives show promise for the production of polymers, generally following condensation routes to polyesters, polyamides, polyurethanes, and others [67]. Limited success has been reported with regard to free radical, cationic, and anionic polymerizations because of difficulties mostly contributed to the central furan molecule, suggesting limited room for growth [67].…”