an be represented as follows: [--CHR21 --CHR22 O--]m wherein R21 and R22 are the same or different and are hydrogen, alkyl, hydroxy-substituted alkyl, or halo-substituted alkyl, and m is an integer of 1 or greater; and (3) C blocks or segments can be represented as follows: [--R23 --] wherein R23 is an organic residue of an epoxide containing two or more epoxy groups. 2.