Disclosed herein are the compounds shown below. Also disclosed are methods of making the compounds. R1=—O—;R2=any alkyl chain;R3=—CH3, —CN, —COOCH3, -tetrazole, -imidazole, or -triazole;R4=—H or —R5;R5=—H, -halogen, —C≡CH, or —C≡C—;n is a positive integer; andm is a positive integer.