... general synthesis scheme of xylitol- based polymers Xylitol (1), was polymerized with citric acid (2) or sebacic acid (3) into poly (xylitol- co-citrate) (PXC) (4), and poly (xylitol- co-sebacate) (PXS) ... (7) PXCma was polymerized into a hydrogel by free radical polymerization using a photoinitiator A simplified representation of the polymers is shown R can be H, –OCH2(CH(OR))3CH2OR (xylitol) , –CO(CH2)6COOR ... (methacrylate – group) xylitol to sebacic acid for PXS 1:1, (1.08:2) xylitol to sebacic acid for PXS 1:2, and (1.02:1) xylitol to citric acid for PXC The degree of substitution of xylitol monomers...