| The comonomers, containing anionic groups such as sulphonate and carboxylate groups, will specifically make PAN fibers dyeable with cationic dyes. |
| Sodium thiophene sulphonate, thiophenetetra-bromide, thiophene diiodide, are all medicinals. |
| By reaction with sodium sulphite it is converted into a hydroquinone sulphonate of deep purple colour. |
| The reaction sequence will be perfected using clean stock solutions of copper nanoparticles functionalized with polyvinylpyrrolidone and sodium dodecylbenzene sulphonate. |
