An Efficient Synthesis of New Azide‐Nitrato‐Hydroxyl‐Terminated Polybutadiene by NaN₃ and (NH₄)₂Ce(NO₃)₆

Abstract

This article reports way to functionalize hydroxyl‐terminated polybutadiene (HTPB) backbone by sodium azide and ceric ammonium nitrate, resulting in the formation of novel azide‐nitrato‐HTPB. In order to optimization of the effective parameters on the synthesis of azide‐nitrato‐HTPB, the starting material concentration, reaction time and temperature were investigated and the effect of these parameters on the azido‐nitrato functionalization of double bonds on HTPB backbone was evaluated. The functionalized HTPB by azidation (7.15 %) and nitration (5.17 %) showed viscosity of 17.6 Pa s−1, number average molecular weight of 2980 g mol−1 and hydroxyl value of 34 mg KOH per g.

On the functionalization and characterization of hydroxyl‐terminated polybutadiene with octyl‐1‐azide and the evaluation of polyurethane elastomers based on such modified HTPB

“…Modified HTPB at 20:1 mass ratio presented the higher temperature T onset , attaining around 180°C. A series of works developed by Pant et al, 13 Ghayeni et al, 33,36 Cho et al 37 and Cegla et al 38 reported the lowering of the initial decomposition temperature of hydroxyl‐terminated polybutadiene when molecules are grafted in its chains, in agreement to what is found herein. The insert in Figure 5 shows that the modified HTPB samples have the same course of mass loss as the pristine HTPBs up to about 130°C.…”