Synthesis of diazo functional copolymers based on melamine-paraformaldehyde

Polymeric architecture at different levels plays a key role to influence the photoresponsive behavior of azo polymers. In the past decades, azo polymers with different polymeric structures have been synthesized, such as sidechain polymers, main-chain polymers, dendritic polymers, crosslinked network, and block copolymers.1,2 Typically, azo polymers can be prepared by radical polymerization and step-growth polycondensation.3,4 In this work diazo functional copolymers based on poly melamine-paraformaldehyde was synthesized. For this purpose firstly the melamine- paraformaldehyde copolymer was synthesized with excess ratio of melamine to form a water soluble copolymer with –NH2 end groups. Then the prepared copolymer was reacted with NaNO2/HCl to from diazonium salt. In the final step, the azo-functionalized copolymers were synthesized using phenol, aniline or 4-nitro aniline compounds. The synthesized compounds were characterized by spectroscopic methods and their properties were studied.

کلیدواژه ها:

Diazo polymers ، Polymerization ، Synthesis ، Diazonium salt.