Restricted accessResearch articleFirst published online 2009-01
In situ Generated Dimethyl Dioxirane (DMD)/Copper(II) (2,2'-diamino-4,4'-bithiazole) Complex as a New Oxidant for Polybutadiene and Hydroxyl Terminated Polybutadiene (HTPB) Epoxidation
Epoxidation of polybutadiene and HTPB are performed by using in situ generated dimethyl dioxirane (DMD) as oxidant and copper(II) (2,2'diamino-4,4 '-bithiazole) (DABTZ) complex as the catalyst at 25°C. For comparison of double bond reactivities, epoxidation reactions are performed on three different types of polybutadiene and HTPBs containing various cis, trans, vinyl microstructures. The tendency of different C=C geometries towards epoxidation are evaluated in detail at various reaction times as well as catalyst concentration and the products are characterized by using 1H NMR, 13C NMR, and FT-IR spectroscopies. Spectra analysis did not show the formation of over-oxidation products even at long reaction times. Another important observation is the preservation of hydroxyl end groups in HTPB chain.
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