1) The document discusses the effect of water content in hydrogen peroxide on the structure of HTPB produced via the radical polymerization of butadiene. 2) The study found that decreasing the water content of hydrogen peroxide increases the effectiveness of the catalyst in the polymerization process. This leads to increased cis-1,4 HTPB structure and decreased vinyl 1,2 structure in the HTPB product. 3) Kinetic studies showed the reaction is first order with respect to monomer concentration. The formation rates of cis, trans, and vinyl structures could be expressed by rate equations, and decreasing water content had different effects on each rate depending on the power index.