Hi, need to submit a 1250 words paper on the topic The Method in Physical Chemistry. Like other conducting polymers, polyaniline has alternating single and double bonds with electrons to move from one side to the other. Polyaniline has three distinct colors depending on its oxidation state. . It also has different colors depending on polymerization, with leucoemeraldine is white, emeraldine is green or blue, and pernigraniline is violet. Further, polyaniline has both acid and base doping response that increases its conductivity in both media types.
The chemical structure of polyaniline consists of six-sided carbon rings with nitrogen between the rings. The inherent organic structure of polyaniline consisting of various alternating benzene ring appears in structure as below.
The preparation of polymers takes place through two mechanisms that include chemical polymerization and electrochemical polymerization. Both involve the use of acid as part of the media in preparation. Chemical polymerization remains comprehensively understood with changes involved during elongation. Both reactions involve breaking some previous bonds in the building unit to join with other units.
Chemical polymerization is a method used, especially in preparing redox polymers (Inzelt, 2012). Redox polymers relate to polymeric organic compounds containing functional groups that can undergo reversible reactions through both oxidation and reduction process. Reversible redox reactions occur within the central polymer chain similar to that of quinine or polyaniline polymers. Consequently, chemical reactions involve building polymer units, a strong oxidizing agent, and a strong inorganic acid. In polyaniline, start by placing an appropriate quantity of 0.1M aniline in the polymerization vessel. The addition of inorganic acids, such as sulfuric acid, follows. Adjusting the volume of the mixture to 100 ml is necessary for standardization. Slow addition, a strong oxidant takes place after placing the polymerization vessel on a magnetic stirrer. This ensures that the polymerization of the aniline subunits is equivalent to the rate of oxidant addition. For a 100 ml solution, the volume of appropriate oxidant used is 20 ml with proper concentrations. Filter the product, then wash with dilute sulfuric acid to get green polyaniline after drying in a vacuum at 60 oC. The oxidant used to assists in forming an active nitrogen joining site in every aniline subunits that forms a polymer.