Acylation of polybutadiene containing 4-phenyl urazole

Abstract

Polybutadiene with a narrow molecular weight is synthesized by anionic polymerization of butadiene monomer in cyclohexane at 20 °C using n-butyllithium as initiator. This polymer is statistically functionalized with 4-phenyl-1,2,4-triazoline-3,5-dione by hydrogen abstraction addition reaction (ene reaction) in an extent of 5, 10, and 15%. These functionalized polymers are reacted with acetyl chloride as well as benzoyl chloride in presence of pyridine at room temperature. These reactions lead to the replacement of N-H with acetyl and benzoyl groups. The amount of urazole and acyl incorporation are determined by 1H NMR technique. Some physical properties of these modified polybutadienes are reported.