PC is most often synthesized from Bisphenol A and phosgene by a step-growth polymerization in which Cl- ions are eliminated every time the monomers react.
This kind of step-growth polymerization is often called a condensation process.
- The first step of the synthesis involves treatment of Bisphenol A with sodium hydroxide, which deprotonates the hydroxyl groups of the Bisphenol A.
- The deprotonated Bisphenol A reacts with Phosgene and a catalyst at temperatures between 25 and 35ºC. This way, a Polycarbonate monomer is formed, and the catalyst (often times Pyridine), is eliminated along with the chloride anion.
- The overall reaction can be written as follows:
No comments:
Post a Comment